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Phenylselenol

    • Product Name Phenylselenol
    • Alias Benzeneselenol
    • Einecs 236-145-3
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
    VTB
    Specifications

    HS Code

    186664

    Chemical Name Phenylselenol
    Chemical Formula C6H5SeH
    Molecular Weight 157.08 g/mol
    Cas Number 638-45-9
    Appearance Colorless to pale yellow liquid
    Boiling Point 220-221°C
    Melting Point -32°C
    Density 1.479 g/cm3
    Solubility In Water Insoluble
    Odor Pungent, unpleasant
    Pka 5.9
    Synonyms Benzeneselenol; Selenophenol
    Hazard Statements Toxic, flammable, and has a very unpleasant odor
    Storage Conditions Store at 2-8°C, under inert atmosphere

    As an accredited Phenylselenol factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing Phenylselenol, 10 g, supplied in an amber glass bottle with a tightly sealed cap and protective labeling to ensure safe handling.
    Shipping Phenylselenol should be shipped in tightly sealed containers under an inert atmosphere to prevent oxidation and decomposition. It must be packaged according to hazardous material regulations, protected from heat, moisture, and incompatible substances. Appropriate chemical hazard labeling and documentation are required, with transport typically restricted to certified carriers due to its toxicity and flammability.
    Storage Phenylselenol should be stored in a cool, dry, and well-ventilated area, away from heat, direct sunlight, and incompatible substances like oxidizers and acids. It must be kept tightly sealed in a corrosion-resistant container, preferably under inert atmosphere (e.g., nitrogen or argon) to prevent oxidation. Properly label the container and follow safety protocols to minimize exposure to toxic vapors.
    Application of Phenylselenol

    Applications of Phenylselenol in Industrial Manufacturing

    Phenylselenol plays a specialized role in advanced organic synthesis and fine chemical production, serving as a unique selenium-containing reagent prized for its selectivity and reactivity in multiple industrial downstream sectors. As a manufacturer, we supply this compound to clients committed to strict compliance, performance consistency, and traceable supply chains. Below, we detail verified, industrial-scale application scenarios grounded in real production environments.

    1. Pharmaceutical API Synthesis: Key Intermediate in Seleno-Modified Drugs

    Leading pharmaceutical manufacturers utilize phenylselenol for the introduction of selenium functionality during API development, especially for anti-inflammatory and anticancer agents, due to its capacity to mediate regioselective selenenylation and facilitate synthesis of selenoethers and selenides. This step typically occurs mid-process, where selectivity and reaction cleanliness directly impact downstream purification and GMP compliance.

    Industry compliance standards

    • ICH Q7 GMP Guidelines
    • USP General Chapters <797>, <467>, and <232> (elemental impurities)
    • European Pharmacopoeia 10.0 monographs (pertinent APIs)
    • Chinese Pharmacopoeia, latest edition (relevant substances and impurity profiles)

    Typical usage ratio

    • 0.2–1.5 molar equivalents relative to target substrate, with ratio determined by reaction stoichiometry and selenium incorporation efficiency in pilot or commercial-scale batch synthesis

    Downstream process integration

    • Added post-activation of aryl halide or alkene intermediate, under inert atmosphere and controlled temperature, preceding aqueous or chromatographic workup

    Final product types

    • Selenoamino acid APIs (e.g., ebselen, selenocysteine analogues)
    • Selenium-based prodrugs and cytoprotective compounds
    • Targeted kinase inhibitors with selenide fragments

    2. Agroscience: Synthesis of Selenium-Enhanced Crop Protection Agents

    Phenylselenol is implemented by agroscience formulators to introduce selenium moieties into custom fungicides and synergists for seed treatments. Its predictable reaction profile supports scalable batch production where regulatory compliance for selenium levels is critical, and the integration pathway must allow for downstream micronutrient labeling and environmental safety reviews.

    Industry compliance standards

    • FAO/WHO Joint Meeting on Pesticide Specifications (JMPS)
    • EU Plant Protection Products Regulation (EC) No 1107/2009
    • US EPA 40 CFR Part 180 (Pesticide Tolerances—Selenium Compounds)
    • ISO 17025 (Laboratory Test Methods)

    Typical usage ratio

    • 0.05–0.20% w/w of batch active mass, with precise loading optimized by selenium content required in registered formulation dossier

    Downstream process integration

    • Introduced during post-condensation blending or in situ functionalization of primary pesticide backbone, enabling subsequent microencapsulation and liquid concentrate formulation

    Final product types

    • Selenium-fortified seed coatings
    • Selenide-based contact fungicides
    • Custom combination biostimulants for cereal and oilseed crops

    3. Silicone Polymer Additives: Precursors for Crosslinking Agents

    Advanced material manufacturers employ phenylselenol as a precursor in the synthesis of selenide-functionalized siloxane crosslinkers, which enable distinct mechanical and UV absorption properties in high-performance silicones for the electronics and optoelectronics industry. The compound’s reactivity facilitates fine-tuning of polymer network architecture in downstream compounders’ proprietary formulations.

    Industry compliance standards

    • ISO 10993-5 (Cytotoxicity of Silicones in Medical Devices)
    • IEC 61249-2-21 (Halogen-free requirements in E&E)
    • RoHS Directive 2011/65/EU, Amendment 2015/863 (Trace Elements in Electronics)
    • UL 94 (Flame Retardancy of Polymers)

    Typical usage ratio

    • 0.03–0.25 mol% relative to siloxane units, custom-calibrated during lab-scale screening to balance thermal stability and flexibility in end-use profiles

    Downstream process integration

    • Charged as a functional crosslinker immediately after pre-polymerization and before catalyst addition within compounding reactors or inline mixers, followed by curing under monitored humidity and temperature

    Final product types

    • Selenide-modified silicone elastomers for LED encapsulation
    • UV-stable electronic potting compounds
    • Flexible circuit board coatings with tailored conductivity

    4. Organic Synthesis Catalysts: Selenylation Reagent in Fine Chemical and Flavor Sectors

    Specialty chemical manufacturers leverage phenylselenol as a selenylation reagent for the targeted assembly of organoselenium catalysts and intermediates, particularly in the flavor and fragrance sector where trace-level modification imparts valued olfactory notes and enhances oxidative stability for delicate esters and aldehydes.

    Industry compliance standards

    • IFRA Code of Practice (Ingredient Handling in Fragrance Manufacturing)
    • ISO 9001 (Quality Management Systems for Fine Chemicals)
    • FEMA GRAS (Flavor Ingredient Safety Designation)
    • REACH Regulation (EC) No 1907/2006 (Substance Registration and Safety)

    Typical usage ratio

    • 0.1–0.8 molar equivalents in reaction sequences; precise ratio defined by electron density and desired selenide content in flavor or catalyst structure

    Downstream process integration

    • Fed during final functionalization or as a nucleophile in catalytic batch or flow processes, with protocols to rapidly quench unreacted selenium and ensure downstream purification per end-client QA

    Final product types

    • Organoselenium catalysts for specialty oxidations
    • Selenide-modified musk compounds and aldehydes
    • Stabilized ester-based flavor ingredients for high-temperature food applications

    5. Analytical Chemistry: Derivatization Agent for Trace Selenium Analysis Standards

    Commercial laboratories and certified reference material producers apply phenylselenol in preparing organoselenium calibration standards for trace-level analysis, ensuring matrix matching and accuracy in environmental, pharmaceutical, and food safety testing. Reliable handling and known purity enable precise comparison against regulatory limits and underpin laboratory accreditation efforts.

    Industry compliance standards

    • ISO 17034 (Reference Material Producers – General Requirements)
    • AOAC Official Methods (Selenium Determination, e.g., AOAC 2015.01)
    • EPA Method 200.8 (Selenium in Water by ICP-MS)
    • USP <561> (Articles of Botanical Origin – Elemental Impurities)

    Typical usage ratio

    • Prepared as 0.1–10 mg/L spike solution; concentration tailored to analytical instrument calibration range and matrix/blank requirements

    Downstream process integration

    • Added at derivatization stage during reference material certification; all dilutions validated by interlaboratory comparison prior to packaging as commercial standards

    Final product types

    • Certified reference materials for ICP-MS and HPLC-ICP-MS calibration
    • Trace-level organoselenium spike solutions for proficiency testing schemes
    • QC check standards for regulated pharmaceutical and environmental laboratories
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    Certification & Compliance
    More Introduction

    Phenylselenol: Hands-On Experience from the Manufacturer’s Bench

    The Realities of Phenylselenol in Modern Synthesis

    Working in chemical manufacturing gives a front-row seat to every step taken from raw material to finished molecule. Among the selective reagents shaping organic chemistry today, phenylselenol earns a place for its practical value and distinct behavior on the shop floor. Not just another aromatic selenol, this compound makes itself essential in multiple steps—across academic research and industrial production.

    What Separates Our Phenylselenol From the Pack

    Our process focuses solely on reproducibility and high yield, using tried-and-tested purification techniques sharpened by years on production lines. Phenylselenol always arrives as a colorless to pale yellow liquid, with a characteristic pungent odor. We keep water and peroxides at bay, storing and shipping under nitrogen to block air sensitivity and moisture pick-up. As a manufacturer, there’s no luxury in cutting corners; shelf stability and batch consistency matter to us as they do for scientists counting on precise outcomes.

    Direct Applications—Where Phenylselenol Shows Its Worth

    The unique chemistry of phenylselenol best suits it for synthesis of organoselenium compounds, including selenoethers and selenides that play a critical role in pharmaceutical research and advanced materials. Coming off the reactor, it’s the selenylating power that users look for—nucleophilic at the selenium atom and able to transfer the phenylseleno group smoothly. Demand often comes from folks running radical cyclization reactions, or working on selenoxide elimination as a method for olefin synthesis. In these transformations, side reactions and by-products can make or break your yield. Offering a clean, pure phenylselenol means our partners in research skip that unpredictable scramble to re-crystallize or distill a poorly purified batch.

    Model, Purity, and Batch Uniformity

    We manufacture phenylselenol in standard and research grades, directly supervised by chemists who run pilot batches before scaling up. Each lot meets tight specifications for GC purity, typically ≥98%, and we test for organosulfur, halide, and heavy metal contamination. No customer ever asked for “theoretical maximum output”—instead, they count on real samples matching certificates again and again. By running consistent analytics, we deliver what a chemist expects: traceable, verifiable product in every shipment, not just the first.

    Why Purity Matters in Selenol Chemistry

    In practical terms, even minor impurities in a selenol reagent can mean serious headaches. Side-reactions triggered by oxidized selenium species or leftover solvents can contaminate precious products, turning a straightforward route into a scavenger hunt for cleanup. Field reports from our pharmaceutical partners repeat this lesson: good selenol gives clean reactions, bad selenol creates long workups and short tempers. At scale, the cost-savings from skipping an extra purification run build up fast, and mistakes compound even faster. That’s why we test every tank for telltale contaminants—a routine learned from years cleaning up the messes cheaper processes leave behind.

    What Makes Phenylselenol Different from Thiols and Tellurols

    Chemically, phenylselenol bridges the gap between thiols and tellurols, bringing together high nucleophilicity with a set of redox properties that make selenium such a peculiar member of the chalcogen family. From experience, users mention the stench and tendency for thiols to oxidize or become unmanageable in air. Tellurols, on the other hand, rarely find a compatible application due to their high toxicity and poor stability. Phenylselenol holds a middle ground: it’s reactive enough to introduce selenium elegantly, yet, with proper storage, gives workable open time and safer operational handling than heavier analogs.

    The Real Risks in Handling and How We Address Them

    Anyone working with organoselenium compounds learns respect for their toxicity—and phenylselenol is no exception. Practically speaking, user safety depends on adherence to good lab practices, efficient ventilation, and avoiding skin or eye contact. Our facility developed closed transfer lines and nitrogen-blanketed systems to limit vapor exposure, ensuring workers dealing directly with liquid phenylselenol face controlled risk. With every shipment, we pass along these in-house guidelines, along with recommended storage solutions. Over the years, routine training and risk assessments have lowered operator complaints about odors and accidental contact, without compromising reactivity or shelf life.

    Customer Feedback and Problem-Solving from the Manufacturer’s Perspective

    Manufacturing isn’t theory; it’s the daily grind of listening to users, tracking timelines, and adjusting processes. Customers—from university labs to multinationals—report issues that textbooks don’t mention. For instance, delays in delivery from overseas disrupt sensitive R&D calendars. Bulk deliveries sometimes encounter shipping holds, especially due to regulatory concerns around selenium-based chemicals. Knowing these pain points, we streamlined our registry and logistics documentation, cut unnecessary hurdles, and designed packaging both robust and safe for international freight.

    Another lesson from feedback: users need technical support long after the invoice clears. If a batch ever falls short, or something in the application shifts, our chemists step in to troubleshoot synthetic routes, adapt purification steps, or diagnose unexpected side-product formation. Long-term partners keep coming back because answers don’t get lost in a ticketing system—they go straight to an experienced hand who knows both the molecule and the business end of a reactor.

    Comparing Phenylselenol with Other Selenium Reagents

    On the manufacturing line, it’s clear that not all selenium compounds deliver the same performance in the lab. Phenylselenyl chloride, for example, offers a different approach to selenylation, yet produces more corrosive by-products and demands extra containment strategies. Diphenyl diselenide brings stability and easier shipping but often falls short on direct selenyl transfer, especially where high nucleophilicity gets the job done fast. Selenourea or selenol esters sometimes serve in specialty synthesis but come with steeper cost or more difficult handling.

    Our experience shows that phenylselenol gives a balance: it brings reliable reactivity without extreme hazard or storage demands. For chemists searching for selective selenide introduction or mild elimination steps, phenylselenol supports transformations that other selenium compounds either complicate or outright spoil. Packing and transport conditions can challenge both thiols and selenols; packaging lined with PTFE or glass prevents corrosion and maintains quality over months rather than weeks.

    Environmental Responsibility and Waste Management

    Running a chemical plant today requires thinking all the way through the product life cycle. Selenium compounds, left unchecked, create challenges for both on-site workers and the environment. Our plant manages waste streams by segregating selenium residue and working with specialist disposal teams; strict monitoring of effluents keeps emissions within regional and national standards. Day-to-day, we replace outdated scrubbing systems with robust filters and real-time gas analyzers. These investments pay back in lower compliance headaches and cleaner workspaces—and they reinforce the importance of responsible chemistry from factory to fume hood.

    Scaling-Up: What Changes from Bench to Bulk

    Lab-scale phenylselenol can seem forgiving, but up-scaling surfaces every impurity, stability hitch, and packaging shortfall. Handling tens of liters at a time, our staff identified new bottlenecks: glassware gives way to lined metal, and routine inerting stops become critical limits in production scheduling. High throughput means demanding sharper process controls—constant monitoring for runaway polymerization or unexpected decomposition, and repeat calibrations for the detectors used to track trace contamination. Each scale jump forces a re-think—if we can’t guarantee batch consistency, yield, and purity, then our customers lose faith.

    Serving Research and Industry: Differing Priorities, Tailored Supply

    Academic labs expect small-volume, high-purity phenylselenol for precise studies. Scale-ups, whether for pharmaceutical synthesis or specialty polymer work, demand bulk containers and technical support. We learned quickly that mixing research and production-line customers without distinction creates confusion. Our solution: side-by-side supply chains, one focused on glass ampoules and rapid documentation for experimentalists, the other on drum lots, stability in transit, and process optimization advice for industrial users. This split approach reduces errors, mismarked packaging, and miscommunication about handling or shelf life specifics.

    Addressing Market Shifts and Disruption

    Selenium’s market often sees unpredictable swings—global events, mines closing, or regulatory changes all impact availability and pricing. As a direct manufacturer, we built relationships with upstream suppliers to buffer against shortages and guarantee real-time information on interruptions. Buying spot-market selenium doesn’t guarantee long-term continuity; holding stock gives stability to customers who plan months or years ahead. During the last cycle of volatility, we managed to cap price increases by leveraging on-site reserves and scheduling early shipment, avoiding the scramble that traps traders and middlemen.

    Transparency and Traceability: Earning Trust Over the Years

    Buyers today want more than a bottle and a batch sheet; they want the story of their reagent, from sourcing to finished bottle. We keep logs on every kilogram of selenium mass-balance, attached COAs, and customer feedback records. Should any issue arise, we track back to every tank, employee, and shipment in the chain. Inspection visits—welcomed by both local and international partners—keep us honest. This transparency, beyond lab analytics, builds the technical trust required for repeat custom, long-term contracts, and collaborative research.

    The Manufacturer’s Role in the Shaping of Chemical Practice

    Our team includes chemists who cut their teeth in R&D as well as plant operators tuned to the realities of process safety and compliance. Bridging these worlds sets us apart from resellers, whose knowledge too often ends at the datasheet. Technical dialogue starts before a customer ever opens a bottle—addressing storage concerns for unstable intermediates, discussing reaction workups, or bouncing ideas for greener process conditions. This dialogue continues in post-sale follow-up, ensuring phenylselenol’s performance lines up with expectations learned over years, not just single-use trials.

    Practical Solutions for Common Selenol Challenges

    Whether a user faces oxidation during transfer, unexpected precipitate after a reaction, or batch-to-batch coloration differences, we’ve likely solved that challenge before. Typical troubleshooting tips—rigorous nitrogen blanketing, using fresh glassware, and double-checking solvent purity—emerged from late-night problem-solving in our own plant. Special requests sometimes result in custom stabilization additives or reformulated storage solutions, tailored for short lead times or long-haul shipments. Our close involvement lets us improvise practical fixes, deliver on unusually tight deadlines, and adapt fast to shifts in demand or regulatory requirements.

    Why Relying on the Actual Manufacturer Makes a Measurable Difference

    Buying direct from the producer means direct access to the people behind the chemical—no added markup, no lag for technical support. We stand behind every lot number, troubleshoot reactions with bench experience, and keep an eye on shifting trends in the world’s selenium supply. By controlling every step, we offer confidence to researchers turning out new medicines or materials, as well as engineers tasked with scaling their lab discoveries.

    Looking Forward: Innovations and Continuous Improvement

    Phenylselenol remains an anchor for efficient selenylation in modern chemistry. Our future effort drives toward further improvements: safer packaging, smarter analytic control, more sustainable production lines, and support for researchers pushing the boundaries of selenium-based reactivity. Every new process integrates both legacy lessons and recent advances—line audits, customer interviews, and strict supplier reviews. Sharing knowledge means everyone benefits—a belief that drives our daily work as hands-on chemical manufacturers, committed to dependable products designed for real-world needs.

    Conclusion: The Practical Value of Transparent, Manufacturer-Driven Phenylselenol Supply

    Years navigating the issues of production, supply, safety, and customer service cement the real differences between manufacturing and trading. Phenylselenol serves as a case study for everything that separates quick sales from lasting partnerships—precision, reliability, and expertise walking hand in hand. In a marketplace crowded with short-term offers, deep understanding and careful manufacturing guarantee every drop of phenylselenol does its job—from the first gram in an academic lab to the last liter on a factory floor.