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| GBL | |
|---|---|
| Name | gamma-Butyrolactone |
| IUPAC name | Oxolan-2-one |
| Other names | 4-Butyrolactone; 1,4-Butyrolactone |
| Formula | C4H6O2 |
| Molar mass | 86.09 g·mol−1 |
| Density | 1.12 g·cm−3 |
| Melting point | −43 °C |
| Boiling point | 204 °C (decomposes) |
| Solubility | Miscible with water |
GBL
gamma-Butyrolactone is a colorless, hygroscopic organic solvent used across chemistry and industry. It is a cyclic ester (lactone) notable for its high polarity, solvent power, and role as a prodrug of a central nervous system depressant; it appears in diverse contexts from pharmaceutical manufacture to industrial formulations. The compound's physical and chemical profile underpins its widespread utility and regulatory scrutiny.
gamma-Butyrolactone is a four-membered oxolane ring containing a carbonyl group, classified as a lactone and a cyclic ester with formula C4H6O2. Its polarity and aprotic character give it strong solvating ability for polar organic reagents and salts; it is miscible with water and many organic solvents. Thermal behavior includes decomposition around elevated temperatures, and it participates in ring-opening reactions to form 4-hydroxybutyrate derivatives, esterification, and transesterification processes familiar to practitioners at Dow Chemical Company, BASF, and academic labs such as Massachusetts Institute of Technology and ETH Zurich. Spectroscopic identification uses infrared carbonyl stretches and characteristic 1H and 13C NMR shifts routinely taught at institutions like University of Oxford and Harvard University.
Industrial synthesis commonly uses catalytic hydrogenation of maleic anhydride or gamma-butyrolactone formation via butadiene oxidation pathways developed by firms including DuPont and ExxonMobil. Laboratory syntheses exploit intramolecular esterification of gamma-hydroxybutyric acid derivatives or cyclization of 4-hydroxybutanal under acidic conditions; such methods are described in textbooks from Wiley and protocols from research groups at California Institute of Technology and University of Cambridge. Heterogeneous catalytic routes using noble metals studied at Max Planck Society facilities and continuous-flow processes advanced by researchers at Imperial College London improve selectivity and reduce byproducts.
As an industrial solvent, it is employed by manufacturers like 3M and Johnson & Johnson for polymer processing, inks, and coatings; it is a precursor for production of pyrrolidones such as N‑methylpyrrolidone used by Bayer and Solvay. In agrochemical synthesis, companies including Syngenta and BASF use it as an intermediate. The chemical finds application in battery electrolytes studied by teams at Toyota and Tesla, Inc. and in electronics fabrication by firms such as Intel Corporation and Samsung Electronics. Academic research at institutions like Stanford University and University of Tokyo explores its role as a green solvent alternative and as a reagent in organic transformations.
gamma-Butyrolactone is metabolically converted in vivo to 4-hydroxybutyrate by ubiquitous lactonases and dehydrogenases; pharmacological effects overlap with compounds investigated at National Institutes of Health and in clinical reports from hospitals including Mayo Clinic and Johns Hopkins Hospital. Central nervous system depression, respiratory compromise, and potential for dependence have led to clinical case series documented in journals affiliated with American Medical Association and The Lancet. Toxicological studies at Centers for Disease Control and Prevention and regulatory toxicology units of European Medicines Agency outline acute overdose management, interactions with sedative-hypnotics from formulary lists at institutions like Cleveland Clinic, and chronic exposure effects. Forensic laboratories at agencies such as Federal Bureau of Investigation and Metropolitan Police Service have developed assays to detect metabolites in biological specimens.
Regulatory frameworks vary: some jurisdictions control distribution through precursor and solvent regulations enforced by agencies like United States Drug Enforcement Administration and European Monitoring Centre for Drugs and Drug Addiction, while others manage it under chemical control regimes at United Nations Office on Drugs and Crime. Industry standards and safety data sheets developed by Occupational Safety and Health Administration and European Chemicals Agency guide workplace exposure limits, transport classifications overseen by International Maritime Organization and International Air Transport Association, and hazardous materials handling protocols in supply chains used by corporations such as FedEx and Maersk. Enforcement actions and scheduling decisions are often discussed in parliamentary committees and regulatory bodies across countries including United Kingdom, Australia, and Japan.
The lactone structure was characterized in 19th-century organic chemistry research reported in proceedings involving chemists from institutions like University of Göttingen and Sorbonne University. The IUPAC name oxolan-2-one and common names such as 4-butyrolactone reflect nomenclature standards set by the International Union of Pure and Applied Chemistry. Industrial adoption expanded in the 20th century with commercialization by chemical companies including Union Carbide and Shell, and subsequent attention from public health authorities and lawmakers in the late 20th and early 21st centuries. Scientific investigations into metabolism and effects were advanced at research centers including Karolinska Institutet and Imperial College London.
Category:Organic solvents Category:Lactones