Introduction
C19H22O6 is a molecular formula that denotes a compound containing nineteen carbon atoms, twenty‑two hydrogen atoms, and six oxygen atoms. This formula is characteristic of a wide range of organic molecules, including polyphenolic compounds, lactones, and certain flavonoid derivatives. The stoichiometry implies the presence of multiple functional groups, such as hydroxyls, methoxy groups, or carbonyls, which contribute to diverse chemical behavior. Because the formula is not unique, it encompasses a family of isomeric structures that differ in connectivity and stereochemistry. The study of compounds with this formula spans several fields, including natural product chemistry, medicinal chemistry, and polymer science. The present article surveys the general properties, synthetic strategies, analytical methods, and applications of C19H22O6, while highlighting notable examples found in nature and the laboratory.
Chemical Properties
Molecular Structure and Isomerism
The arrangement of nineteen carbons, twenty‑two hydrogens, and six oxygens allows for a variety of structural motifs. One common scaffold is the benzofuran or coumarin core fused to a phenolic ring, with additional hydroxyl or methoxy substituents. Other possibilities include extended aromatic systems such as stilbenes, diarylheptanoids, or bis‑cyclohexane structures bearing lactone rings. Stereochemistry plays a significant role: chiral centers may be present at spiro junctions or within cyclic systems, leading to diastereomers and enantiomers that can exhibit markedly different biological activities. Isomeric diversity is further amplified by the potential for both cis‑trans isomerism in double bonds and conformational isomerism in flexible aliphatic chains. As a result, C19H22O6 serves as a parent formula for numerous analogues with distinct physical and chemical properties.
Physical Properties
Compounds with the C19H22O6 formula typically display moderate to high molecular weights, around 350 to 360 g·mol^–1. Their melting points vary widely, from approximately 120 °C for relatively rigid polycyclic systems to below 0 °C for flexible, non‑aromatic derivatives. Boiling points for volatile species may range from 200 °C to over 300 °C, depending on hydrogen bonding capacity and molecular symmetry. Solubility in organic solvents such as ethanol, methanol, and dichloromethane is generally good, whereas aqueous solubility is limited for highly hydrophobic analogues. Polymorphism is common in crystalline materials, leading to distinct polymorphic forms with subtle differences in lattice energy and stability. Vapor pressures are low for most aromatic derivatives, reflecting their substantial non‑polar surface area and reduced volatility.
Reactivity and Stability
The presence of multiple oxygen atoms confers a range of reactivity pathways. Phenolic hydroxyl groups are prone to oxidation, leading to quinone or semiquinone intermediates, while methoxy groups can undergo demethylation under acidic or enzymatic conditions. Lactone moieties exhibit susceptibility to hydrolysis, particularly in basic media, yielding carboxylic acids and hydroxy‑ketones. Aromatic systems may participate in electrophilic substitution reactions, such as nitration or sulfonation, with regiochemical control influenced by electronic substituents. In addition, the conjugated systems within C19H22O6 compounds allow for photochemical reactions, including photooxidation or photoisomerization, especially in the presence of sensitizers or transition metal catalysts. Overall, the chemical stability of a given isomer depends on the balance between electron-donating and electron-withdrawing groups, as well as steric protection around reactive centers.
Occurrence and Sources
Natural Occurrence
Several naturally derived molecules satisfy the C19H22O6 formula. For instance, the polyphenolic compound scutellarein 7‑O‑β‑glucopyranoside features a core flavone skeleton with hydroxyl and methoxy substituents, and an additional sugar moiety contributes to the overall carbon count. Other examples include stilbenoid dimers such as gnetin C, where two resveratrol units are linked via a biaryl bond, resulting in a rigid, planar structure rich in phenolic hydroxyls. Diarylheptanoids isolated from marine sponges and sea urchins, like spinochalcone A, also possess this formula, displaying extended aliphatic chains between aromatic rings. The presence of such compounds in diverse biological matrices reflects the evolutionary advantage conferred by antioxidant, anti‑influenza, or anti‑inflammatory properties. Extraction from plant tissues typically involves organic solvents, followed by chromatographic purification, to isolate the target C19H22O6 molecules.
Synthetic Derivatives
In the laboratory, chemists design C19H22O6 analogues to explore structure‑activity relationships. A notable synthetic series involves the condensation of substituted benzaldehydes with diethyl malonate, followed by intramolecular cyclization to yield coumarin derivatives bearing additional hydroxy or methoxy groups. Another approach uses Friedel‑Crafts acylation of aromatic rings, generating β‑keto esters that can be cyclized to lactones. The modularity of these reactions allows for systematic variation of substituent patterns, enabling the creation of libraries for screening in pharmaceutical or agrochemical research. Synthetic routes often incorporate protecting group strategies to mask sensitive hydroxyl functionalities during key transformations, and deprotection steps at the final stage restore full functionality, ensuring the desired C19H22O6 structure.
Synthesis and Preparation
Historical Methods
Early synthetic efforts focused on the generation of coumarin cores through the Pechmann condensation of phenols with β‑keto esters. For C19H22O6 analogues, researchers modified this methodology by introducing additional hydroxyl or methoxy groups on the aromatic ring prior to condensation, resulting in highly substituted coumarins. The development of the Claisen rearrangement and subsequent oxidation steps also provided routes to diaryl compounds matching the molecular formula. Throughout the mid‑20th century, these classical strategies dominated the production of polyphenolic C19H22O6 species.
Modern Synthetic Routes
Contemporary synthetic plans leverage cross‑coupling reactions, particularly palladium‑catalyzed Suzuki‑Miyaura and Stille couplings, to assemble biaryl frameworks. For example, the coupling of a boronic acid bearing a hydroxyl or methoxy substituent with a halogenated aromatic partner yields a biaryl core, which can then be functionalized through further oxidation or esterification to attain the desired oxygen count. Enzymatic oxidation of phenolic substrates using monooxygenases is another modern strategy that offers regioselective introduction of oxygen functionalities under mild conditions. In addition, microwave‑assisted synthesis has accelerated reaction times for lactone formation, improving overall yields and reducing energy consumption.
Biocatalytic Approaches
Biocatalysis exploits the selectivity of enzymes to generate C19H22O6 molecules with precise stereochemistry. Flavone synthase and cytochrome P450 enzymes, for instance, can catalyze the oxidative cyclization of dihydroflavonols, producing coumarin derivatives. Laccases and peroxidases are employed to oxidize phenolic monomers into dimers or oligomers, providing access to diarylheptanoids and stilbenoids. These enzymatic routes are attractive for producing natural product analogues at scale, as they typically operate under aqueous conditions, avoid toxic reagents, and minimize waste. Genetic engineering of microbial hosts further enhances the feasibility of in vivo synthesis of complex C19H22O6 structures.
Spectroscopic and Analytical Characterization
Mass Spectrometry
Electrospray ionization (ESI) and matrix‑assisted laser desorption/ionization (MALDI) are commonly used to confirm the molecular mass of C19H22O6 compounds. The [M+H]^+ ion appears at m/z 351, while the sodium adduct [M+Na]^+ is observed at m/z 373. Fragmentation patterns often involve cleavage of methoxy groups, yielding characteristic losses of 31 Da or 15 Da, and the appearance of phenolic fragments at m/z 147 or 119, depending on the substitution pattern. High‑resolution mass spectrometry (HRMS) provides accurate mass measurements with error margins below 5 ppm, enabling definitive assignment of the elemental composition.
Infrared Spectroscopy
Fourier‑transform infrared (FT‑IR) spectroscopy reveals key functional groups in C19H22O6 molecules. Broad absorption bands around 3300–3500 cm^–1 correspond to O‑H stretching of phenolic hydroxyls. Aromatic C=C stretching appears near 1600 cm^–1, while methoxy groups produce C‑O stretching bands at 1150–1250 cm^–1. Lactone carbonyls display characteristic absorptions near 1730–1750 cm^–1. The presence of conjugated systems can be inferred from absorptions in the 1400–1500 cm^–1 region, whereas aliphatic C‑H stretching is observed at 2850–2950 cm^–1.
Nuclear Magnetic Resonance
Proton NMR spectra of C19H22O6 compounds typically exhibit aromatic multiplets between δ 6.0–8.0 ppm, reflecting hydrogen atoms on phenyl rings. Phenolic protons resonate at δ 9.0–10.5 ppm as broad singlets due to hydrogen bonding. Methoxy groups appear as singlets at δ 3.5–4.0 ppm. Aliphatic protons from saturated chains or cyclic moieties show multiplets between δ 1.0–3.5 ppm. Carbon‑13 NMR confirms the presence of carbonyl carbons at δ 165–180 ppm and aromatic carbons in the δ 110–160 ppm range. Two‑dimensional NMR techniques such as COSY, HSQC, and HMBC enable detailed connectivity mapping, essential for distinguishing isomeric structures.
Applications
Pharmaceuticals
Compounds with the C19H22O6 formula have been investigated for their therapeutic potential. Some coumarin derivatives exhibit anticoagulant properties, similar to warfarin, and have been explored as alternatives with improved safety profiles. Diarylheptanoids derived from marine sources demonstrate anti‑inflammatory activity through inhibition of cyclooxygenase enzymes, while stilbenoid dimers show antiviral effects against influenza A virus by disrupting viral replication pathways. The antioxidant capacity of many C19H22O6 molecules contributes to neuroprotective effects, positioning them as candidates for the treatment of neurodegenerative diseases. Additionally, selective receptor binding studies have identified analogues with high affinity for estrogen receptors, offering prospects for hormone‑based therapies.
Agricultural Chemicals
Several C19H22O6 compounds have been developed as herbicides or fungicides. Coumarin analogues containing additional hydroxyl groups function as bioherbicides that inhibit photosynthetic electron transport. The lipophilic nature of certain diarylheptanoids facilitates penetration of plant cuticles, enabling them to act as growth regulators or protectants against fungal pathogens. Studies on field efficacy report that optimized formulations maintain activity under varying environmental conditions, demonstrating the practical value of these compounds in crop protection.
Cosmetics and Personal Care
The antioxidant and UV‑blocking properties of C19H22O6 molecules make them attractive ingredients in cosmetic formulations. Coumarin derivatives are incorporated into skin‑care products to mitigate photo‑aging, while stilbenoid dimers provide anti‑inflammatory benefits in topical creams. The solubility of many analogues in organic solvents allows their integration into emulsions or liposomal carriers, enhancing dermal delivery. Moreover, the mild fragrance profile of certain phenolic compounds contributes to sensory appeal in perfumery applications.
Materials Science and Polymer Chemistry
In polymer chemistry, C19H22O6 units can serve as monomers or comonomers for the synthesis of functionalized polymers. The lactone moiety in coumarin analogues participates in ring‑opening polymerization to generate polyesters with tunable mechanical properties. The conjugated aromatic systems provide sites for photo‑crosslinking, enabling the fabrication of responsive hydrogels. Additionally, the incorporation of hydroxyl groups allows for post‑polymerization modification through esterification or etherification, expanding the range of material properties such as hydrophilicity, adhesion, and bioactivity. These materials find applications in drug delivery, tissue engineering, and optical devices.
Health and Safety Considerations
Toxicological Profile
Safety data for C19H22O6 compounds vary with structure. Coumarin derivatives, for instance, can cause hepatotoxicity at high doses, necessitating careful dose‑response studies. Some diarylheptanoids exhibit mild irritant properties when applied to the skin, but are generally well tolerated at therapeutic concentrations. In vitro assays have revealed low cytotoxicity for many stilbenoid dimers; however, metabolic activation can produce reactive intermediates capable of protein adduct formation. Comprehensive toxicological evaluation, including acute and chronic exposure studies, is essential prior to clinical development.
Regulatory Status
Regulatory classification of C19H22O6 compounds depends on intended use. Pharmaceutical agents undergo stringent approval processes, requiring evidence of efficacy, safety, and manufacturing consistency. Agricultural chemicals must satisfy phytosanitary and environmental regulations, including assessments of residue persistence and non‑target organism impact. Cosmetic ingredients are evaluated under consumer product safety frameworks, ensuring that levels of potential allergens or irritants remain below threshold limits. The absence of a universal classification for the molecular formula necessitates case‑by‑case regulatory review.
Related Compounds
Structural Analogues
Variations of the coumarin skeleton, such as 4‑hydroxy‑3‑methoxy‑2‑oxo‑2H‑benzopyran, provide insight into the role of substituent orientation on bioactivity. Stilbenoid analogues with single aromatic rings but similar oxygen counts illustrate the importance of dimerization for antiviral potency. The presence of additional methoxy groups or extended alkyl chains in diarylheptanoids shifts physicochemical properties, allowing for systematic exploration of lipophilicity versus solubility.
Biotransformation Pathways
Metabolic studies show that enzymes such as CYP3A4 oxidize coumarin cores, producing metabolites that still satisfy the C19H22O6 elemental composition but exhibit altered bioavailability. Laccase‑mediated dimerization of phenolic monomers leads to oligomers that maintain the molecular formula while introducing new ring systems. Understanding these pathways informs both synthetic design and predictive toxicity modeling, offering a deeper appreciation of the interconnectedness of C19H22O6 chemistry.
Conclusion
The C19H22O6 molecular formula encompasses a diverse family of organic compounds, ranging from natural products to engineered analogues. Their rich structural diversity underpins a broad spectrum of applications across pharmaceuticals, agriculture, cosmetics, and materials science. Advances in synthetic methodology, particularly cross‑coupling and biocatalytic strategies, have expanded the ability to generate high‑quality C19H22O6 molecules with precise stereochemistry. Spectroscopic techniques such as HRMS, FT‑IR, and NMR confirm identity and purity, while detailed toxicological assessments ensure safe deployment. Continued research into structure‑activity relationships and material integration promises further expansion of the utility of C19H22O6 compounds in both industrial and therapeutic contexts.
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