Overview
Ketones are a class of organic compounds featuring a carbonyl group (C=O) bonded to two hydrocarbon groups (alkyl or aryl). They are structurally distinct from aldehydes, where the carbonyl group is bonded to at least one hydrogen atom. Ketones are ubiquitous in nature (e.g., fructose, progesterone) and industrial chemistry. The simplest ketone, acetone (CH₃-CO-CH₃), is a benchmark solvent. Ketones are synthesized via oxidation of secondary alcohols or Friedel-Crafts acylation. Their reactivity—particularly in nucleophilic addition reactions—makes them versatile intermediates in organic synthesis.
Physical and Chemical Properties
Ketones are polar due to the carbonyl group, enabling hydrogen bonding with water for lower members (e.g., acetone). Boiling points are higher than analogous alkanes but lower than alcohols of similar mass. Most are volatile liquids with characteristic sweet or pungent odors. Chemically, ketones undergo addition reactions (e.g., with Grignard reagents) and oxidation to carboxylic acids under harsh conditions. They resist mild oxidizers, distinguishing them from aldehydes. Aromatic ketones (e.g., acetophenone) exhibit reduced reactivity due to conjugation.
Main Applications
Ketones dominate as industrial solvents. Acetone and methyl ethyl ketone (MEK) dissolve resins, plastics, and coatings. Cyclohexanone is critical in nylon-6 production. In pharmaceuticals, ketones serve as intermediates (e.g., ibuprofen synthesis). Fragrance industries use musk ketones for their stable, floral scents. Smaller ketones (e.g., diacetyl) impart buttery flavors in food. Specialty ketones like fluorenone are employed in OLED materials and agrochemicals.
Safety and Storage
Lower ketones (e.g., acetone) are highly flammable (flash points < 0°C) and require explosion-proof handling. Prolonged exposure may cause dizziness or dermatitis. Proper PPE (gloves, goggles) and fume hoods are mandatory in labs. Store ketones in tightly sealed containers, away from oxidizers (e.g., peroxides). Large quantities demand flammable storage cabinets or dedicated tanks with grounding to prevent static sparks. Spills should be absorbed with inert materials (sand, vermiculite).
B2B Procurement Guide
Bulk buyers should prioritize purity grades (e.g., ≥99.5% for pharmaceuticals) and packaging options (ISO tanks for >1,000L). Verify supplier compliance with regional regulations (e.g., TSCA, REACH). Spot prices fluctuate with crude oil derivatives (ketones are often petroleum-sourced). Long-term contracts may hedge volatility. For green chemistry, bio-based ketones (e.g., from fermentation) are emerging but costlier.
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