Introduction
C19H30O5S denotes a neutral organic molecule composed of nineteen carbon atoms, thirty hydrogen atoms, five oxygen atoms, and a single sulfur atom. The specific arrangement of these atoms determines the chemical identity, but the formula itself is shared by several structurally diverse compounds. Molecules with this stoichiometry are often characterized by long hydrocarbon chains combined with multiple oxygen‐bearing functional groups and a sulfur atom that may appear as a thioether, sulfoxide, or sulfone. Their high carbon content confers lipophilic character, while the oxygen atoms introduce polarity, enabling these compounds to act as surfactants, intermediates in organic synthesis, or precursors for specialized materials.
The presence of both hydrophilic and hydrophobic moieties places such compounds at the interface of biological membranes and industrial processes. As a result, a wide range of C19H30O5S isomers find applications in pharmaceuticals, cosmetics, agrochemicals, and materials science. This article surveys the general features, synthetic strategies, reactivity patterns, and practical uses of compounds with this molecular formula, while also highlighting safety and environmental considerations.
Structural Characteristics
Functional Group Diversity
Compounds sharing the C19H30O5S formula may incorporate one or more of the following functional groups:
- Alkyl chains (straight or branched) that provide hydrophobicity.
- Alkyl sulfides or thioethers where sulfur links two carbon chains.
- Sulfones (SO2) or sulfoxides (SO) which introduce strongly polar, oxidized sulfur centers.
- Ester linkages (R–COOR') that add both carbonyl and alkoxy functionalities.
- Alcohols (–OH) and phenols that contribute hydrogen bonding capability.
Isomeric diversity arises from the position of the sulfur atom, the degree of branching in the carbon skeleton, and the arrangement of ester or hydroxyl groups. For example, a thioether might link two long chains, whereas a sulfone could be attached to a single alkyl group and a phenyl ring. The relative placement of ester bonds determines the potential for hydrolysis and transesterification reactions.
Degrees of Unsaturation
The degree of unsaturation (double bond equivalents) for C19H30O5S is calculated as follows:
- Calculate the saturated formula: C19H(2×19+2)=C19H40.
- Subtract the actual hydrogen count: 40 – 30 = 10.
- Divide by 2 to account for two hydrogens per unsaturation: 10 ÷ 2 = 5.
Thus, the molecule possesses five degrees of unsaturation, which can be attributed to rings, double bonds, or heteroatom functionalities. In many isomers, these degrees are realized by the presence of two ester bonds (each contributing one), a sulfone group (contributing one), and possibly one carbonyl or conjugated system. This framework facilitates diverse chemical behavior, such as nucleophilic attack on carbonyl carbons or oxidation of sulfur centers.
Conformational Flexibility
The long hydrocarbon chains grant significant rotational freedom around sigma bonds, enabling the molecule to adopt multiple conformations in solution. Steric interactions between branching points or functional groups can stabilize certain shapes, influencing solubility and interaction with enzymes or receptors. The sulfur atom often acts as a pivot, allowing the molecule to adopt conformations that position polar groups for specific binding events.
Physical Properties
State and Appearance
Most C19H30O5S compounds are liquids at ambient temperature, ranging from colorless oils to slightly tinted viscous liquids. Their refractive indices typically fall between 1.40 and 1.50, reflecting moderate polarity. The presence of multiple oxygen atoms elevates the boiling point relative to analogous hydrocarbons, often placing it between 260 °C and 320 °C. Melting points are usually below –10 °C for the liquid forms, but solid crystalline isomers may exhibit melting points near room temperature if sufficient rigidity exists.
Solubility Profile
Due to the balance of lipophilic chains and polar functional groups, these molecules show limited solubility in water (typically
Spectroscopic Signatures
Infrared spectroscopy reveals characteristic absorption bands:
- ≈1730 cm⁻¹: ester carbonyl stretch.
- ≈1220–1280 cm⁻¹: sulfone S=O stretch.
- ≈1050–1150 cm⁻¹: C–O–C ether stretch.
- ≈3300 cm⁻¹ (broad): –OH or –SH stretch.
In nuclear magnetic resonance, the ^1H spectra show multiplets for methylene protons in the aliphatic region (0.8–1.8 ppm), a distinctive singlet or multiplet for methoxy or methyl groups near 3.4–4.0 ppm, and a sharp singlet or doublet for protons adjacent to the sulfur center between 2.5 and 3.5 ppm. The ^13C spectra exhibit signals for carbonyl carbons (~170–180 ppm), sulfone‐adjacent carbons (~45–65 ppm), and aliphatic carbons (~10–45 ppm). Mass spectrometry typically displays a molecular ion peak at m/z 372, corresponding to the exact mass of C19H30O5S.
Synthesis and Derivation
Commercial Preparation
Industrial routes to C19H30O5S compounds generally begin with fatty acid derivatives or long‑chain alcohols. A common strategy involves esterification of a long‑chain carboxylic acid with an alcohol containing a sulfur functionality, followed by oxidation of the sulfur center to yield a sulfone or sulfoxide. The overall process may be summarized as:
- Activation of the carboxylic acid (e.g., via acid chloride or acid anhydride).
- Nucleophilic attack by a thioether or thiol alcohol to form an ester with a sulfur substituent.
- Controlled oxidation using oxidants such as hydrogen peroxide or peracids to introduce the desired oxidation state of sulfur.
- Purification by distillation or chromatography to isolate the target isomer.
Alternative approaches use sulfur ylides to form sulfonium salts, which upon hydrolysis yield the desired C19H30O5S compounds. The choice of method depends on the functional groups present, desired stereochemistry, and production scale.
Laboratory‑Scale Synthetic Routes
Small‑scale synthesis often employs the following steps:
- Preparation of 1-alkyl-2-hydroxyethyl sulfide via alkylation of a thiol with a 2-hydroxyethyl halide.
- Conversion of the alcohol to an ester using dicyclohexylcarbodiimide (DCC) or N‑hydroxysuccinimide (NHS) chemistry.
- Oxidation of the sulfide to the corresponding sulfone with m‑chloroperbenzoic acid (mCPBA).
- Final purification by flash chromatography on silica gel, using a gradient of hexane/ethyl acetate.
Reaction yields typically range from 50 % to 80 %, depending on the substrate’s steric hindrance and the oxidation protocol’s efficiency. Spectroscopic verification ensures correct functional group placement before further application.
Biological and Natural Sources
Several C19H30O5S molecules are isolated from plant or microbial extracts. For instance, certain sea‑weed species produce long‑chain sulfated fatty acids that possess antimicrobial activity. Bacterial fermentation can generate sulfurous esters with high functional group density. Extraction typically involves solvent partitioning followed by chromatography. While the natural compounds often have unique configurations, they share the core C19H30O5S skeleton, illustrating nature’s ability to tailor these structures for specific ecological functions.
Chemical Reactivity
Nucleophilic Acyl Substitution
Esters within the molecule are susceptible to nucleophilic attack by alcohols, amines, or water. Under acidic or basic catalysis, transesterification or hydrolysis can occur, yielding free carboxylic acids or diols. The presence of a sulfone moiety reduces the electrophilicity of the ester carbonyl, but steric factors can still influence reaction rates. Typical conditions involve reflux in aqueous ethanol or aqueous acid solutions for hydrolysis, and use of Lewis acids such as boron trifluoride for transesterification.
Reductive and Oxidative Transformations
The sulfur atom offers versatile redox chemistry. Reductive pathways can convert a sulfone or sulfoxide back to a thioether using reagents like lithium aluminum hydride or sodium borohydride in the presence of a catalyst. Oxidation of a thioether to a sulfoxide or sulfone is commonly achieved with peroxides or peracids. These transformations allow conversion between isomeric forms, facilitating synthesis of derivatives with tailored polarity.
Photochemical Behavior
Long aliphatic chains exhibit low absorption in the UV–vis range, but the ester and sulfone groups can undergo photochemical cleavage under high‑energy irradiation. Such processes are generally undesirable in storage but can be harnessed in controlled photolysis to generate reactive intermediates for further functionalization. Light‑induced radical formation at the sulfur center may lead to chain scission or cross‑linking reactions in polymeric contexts.
Applications
Surfactants and Emulsifiers
Compounds with the C19H30O5S formula are widely employed as nonionic surfactants. Their amphiphilic nature allows formation of micelles and stable emulsions, which are essential in detergents, shampoos, and cosmetic creams. The high number of oxygen atoms enhances hydrophilicity, while the long hydrocarbon tail ensures surface activity. Typical commercial products include fatty alcohol sulfates and sulfated esters used in cleaning agents for their low irritation and high foaming properties.
Lubricants and Additives
Due to their viscous character and thermal stability, some C19H30O5S isomers serve as lubricant additives. They improve wear resistance in metal–metal contact and reduce friction coefficients. In automotive and industrial machinery, these additives are blended with base oils to enhance performance under high‑temperature conditions. Their sulfur functionality also contributes to antioxidant properties, extending the service life of lubricants.
Pharmaceutical Precursors
In medicinal chemistry, C19H30O5S compounds act as intermediates in the synthesis of bioactive molecules. For example, the sulfone group can be a site for further substitution, yielding sulfonamide drugs with anti‑inflammatory or antimicrobial activity. Esterification patterns influence pharmacokinetics, such as absorption and metabolic stability. Researchers utilize these molecules in the development of lipid‑based drug delivery systems, where the hydrophobic tail aids membrane penetration and the polar head group enhances aqueous solubility.
Agrochemical Formulations
Some derivatives are used as adjuvants in pesticide formulations. Their surfactant properties increase the wetting and spreading of active ingredients on plant surfaces, improving efficacy. Additionally, certain sulfur-containing esters exhibit inherent pesticidal activity, acting as fungicides or insect repellents. Their environmental persistence is moderated by biodegradation pathways that cleave the ester linkage, preventing long‑term accumulation.
Material Science and Polymerization
The presence of both ester and sulfur functional groups enables incorporation into polymer matrices. Copolymerization of C19H30O5S monomers with acrylates or methacrylates yields flexible, biocompatible materials useful in coatings, adhesives, and medical devices. Sulfone linkages impart thermal stability and mechanical strength, while ester groups provide points of hydrolysis for controlled degradation. These properties make the molecules suitable for biodegradable plastics and responsive hydrogels.
Research Tools and Standards
Standard reference materials with the C19H30O5S formula are used in analytical chemistry for calibration of chromatographic and spectroscopic techniques. Their well‑defined purity and known physicochemical data serve as benchmarks for validating new instrumentation and methods. Additionally, they are employed as internal standards in mass spectrometry to quantify related compounds in complex mixtures.
Analytical Techniques
Chromatography
High‑performance liquid chromatography (HPLC) with a reversed‑phase column is the primary method for separating C19H30O5S isomers. Mobile phases typically consist of water–acetonitrile or water–methanol gradients with an acidic modifier (e.g., formic acid) to suppress tailing of polar groups. Detection can be achieved by UV absorption at 210 nm or by evaporative light‑scattering detector (ELSD) for non‑UV‑active compounds.
Mass Spectrometry
Electrospray ionization (ESI) in negative mode readily ionizes the ester and sulfone groups, producing a robust molecular ion. Tandem mass spectrometry (MS/MS) provides fragmentation patterns that distinguish isomeric forms: cleavage at the ester bond yields a fragment at m/z 140, whereas sulfone‑associated fragments appear at m/z 180. Ion trap or quadrupole analyzers can generate full‑scan spectra for quantitative analysis, while time‑of‑flight (TOF) provides high‑resolution mass data.
Spectroscopy
Infrared and Raman spectroscopy confirm functional groups. Nuclear magnetic resonance (NMR) spectroscopy, particularly ^1H and ^13C, is essential for structural assignment and stereochemical determination. 2D NMR experiments such as COSY and HSQC elucidate proton–carbon connectivities, while NOESY or ROESY can reveal spatial proximities useful in conformational studies.
Spectrophotometric Methods
Ultraviolet–visible (UV–vis) spectroscopy is limited due to low absorption of aliphatic chains, but can detect absorbance of the sulfone group in the far‑UV region (
Environmental and Toxicological Aspects
Biodegradability
Microbial degradation typically targets the ester linkage, producing free fatty acids and alcohols that enter standard metabolic pathways. Sulfone groups may resist microbial attack, but in the presence of reductive microorganisms, they can be reduced to sulfides and subsequently oxidized or sulfonated. Overall, C19H30O5S compounds exhibit moderate biodegradability, with half‑lives ranging from several days to weeks under aerobic conditions.
Acute Toxicity
In vitro cytotoxicity assays indicate low toxicity for nonionic surfactant forms, reflected in LC50 values >1000 µM for mammalian cell lines. However, exposure to certain sulfur‑containing esters can elicit mild irritation or sensitization in skin and respiratory tissues. The degree of toxicity correlates with the degree of oxidation at the sulfur center, as sulfides are generally less reactive than sulfonamides or sulfates.
Chronic Exposure
Long‑term studies in animal models demonstrate limited systemic absorption of C19H30O5S surfactants. Their primary route of elimination is excretion via bile or feces, facilitated by hepatic esterases that hydrolyze the ester bond. Environmental monitoring reveals that concentrations in soil and water remain below regulatory thresholds after standard use, confirming acceptable risk profiles for large‑scale application.
Regulatory Status
Safety Data Sheets
Standard SDS for C19H30O5S compounds outline hazard classification, exposure limits, and recommended protective measures. Key points include the potential for eye and skin irritation, the necessity of respiratory protection during handling of dust or aerosols, and the requirement for proper ventilation when using solvents in synthesis.
Classification
Under the Globally Harmonized System (GHS), these compounds are typically classified as non‑hazardous (Category 1) for skin and eye irritation when used at concentrations below 5 %. They may be classified as irritants (Category 2) or sensitizers (Category 3) if impurities are present or if the surfactant is heavily sulfated. Regulatory agencies such as the European Union’s REACH program require registration for substances used in commercial quantities, ensuring that exposure assessments and environmental fate studies are conducted.
Environmental Impact
Regulatory guidelines emphasize monitoring of sulfur‑based emulsifiers to prevent eutrophication. Degradation studies show that these molecules break down into short‑chain fatty acids and alcohols, which are readily assimilated by aquatic organisms. The use of biodegradable formulations, coupled with controlled release of active ingredients, aligns with environmental protection standards and supports sustainable manufacturing practices.
Future Perspectives
Green Chemistry Initiatives
Research focuses on developing solvent‑free or aqueous‑phase synthesis routes to reduce environmental burden. Photocatalytic oxidation of sulfides using visible light and benign catalysts offers a greener alternative to peracids. Enzymatic esterification using lipases also provides mild, selective methods suitable for scale‑up. Additionally, the use of renewable feedstocks, such as plant‑derived long‑chain alcohols, enhances sustainability.
Targeted Drug Delivery
By tuning the ester cleavage rate, C19H30O5S molecules can be engineered as prodrugs that release active drugs in response to physiological conditions. This strategy holds promise for site‑specific delivery, reducing systemic side effects and improving therapeutic indices. Ongoing studies investigate incorporation into nanoparticles or micelles to facilitate crossing of biological barriers such as the blood–brain barrier.
Biodegradable Polymers
Incorporation of these molecules into polymer networks offers an avenue for creating fully biodegradable plastics with high mechanical performance. Research explores copolymerization with biodegradable monomers such as lactide or glycolide, producing materials that degrade under physiological or environmental conditions. The presence of sulfone linkages ensures that the material remains functional until the ester bonds are hydrolyzed, enabling controlled release of embedded agents.
Enhanced Agrochemical Efficacy
Design of multifunctional adjuvants combining surfactant and pesticidal activity is underway. By optimizing the balance between hydrophobicity and polarity, researchers aim to reduce the quantity of active ingredients required while maintaining or improving target‑organism efficacy. The ability to degrade rapidly after application minimizes environmental persistence, addressing concerns about non‑target organism exposure.
Advanced Coatings and Surface Engineering
Surface coatings that resist biofouling and corrosion benefit from the inclusion of C19H30O5S molecules. Their sulfur functionality can act as a binding site for metal ions, improving adhesion to metal substrates. Additionally, their ester groups allow for post‑treatment cross‑linking to enhance durability. Emerging technologies such as self‑healing coatings utilize the ability of these molecules to undergo radical‑mediated cross‑linking, restoring integrity after mechanical damage.
Conclusion
The C19H30O5S chemical class presents a versatile platform bridging organic synthesis, environmental chemistry, and industrial application. Its balanced amphiphilicity, functional group density, and robust reactivity allow it to serve as surfactant, lubricant, pharmaceutical intermediate, and material building block. Continued research focuses on greener synthesis routes, targeted biological applications, and the development of sustainable materials, underscoring the compound’s relevance across a spectrum of scientific and commercial disciplines.
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