Product Description

1, 4 - butyrolactone, also called gamma butyrolactone, 4 - hydroxy butyric acid lactone. Is a colorless, oily liquid, can be immiscible with water, but soluble in methanol, ethanol, acetone, ether and benzene. Can with water vapor volatilization and decomposition in hot alkali solution, fragrant smell.

Molecular formula: C4H6O2

Molecular structure: carbonyl C and O atoms to sp2 hybrid orbitals form sigma bond. Other C and O atoms to sp3 hybridized orbital forming sigma bond.

The relative molecular weight € *6.*9

Relative density 1.***3 density € € (*5/4 ƒ)

Melting point (ƒ) € € *3.*3

The boiling point (ƒ) € **4

The refractive index of *5 ƒ € 1.***8

World electric constant (*0 ƒ) *9

Dipole moment (*5 ƒ benzene) : *3.*4

Critical temperature: **6 ƒ

Critical pressure: 3.4 mPa.

Viscosity: 1.7 mPa s *5 degrees C.

Tension: *2.3 mN/m. *5 degrees C.

Flash: *8.3 (open loop).

Evaporation heat (**4 ƒ) (kj/mol) : *2.3

In a neutral medium stability, reversibility in hot alkali hydrolysis, ph back to neutral and generate lactone, hydrolysis in acidic medium is slower.

"Dissolve situation"

Miscibility with water, but soluble in methanol, ethanol, ethyl ether, acetone, benzene, carbon tetrachloride.

Use note: for combustible liquid, avoid direct contact with the fire.

Toxicity: low toxicity. In mice by oral LD*0 = **5 mg/kg. Are irritating to the skin.

The derivatives of 1, 4 - butyrolactone is numerous, can be the product of the reaction generated by a variety of different and wide range of USES, specific as follows: [1]

Generate gamma hydroxy butyric acid hydrolysis, resin can be used as special plasticizer, pharmaceutical intermediates;

For the oxidation of ChengDing diacid; Reduction to generate 4 - hydroxy butyl aldehyde, 1, 4 - butanediol then restore formation;

Generate alpha, condensation acetal in alpha hydroxy ketone;

Can react with CH3NH2, generate N - methyl - 2 - pyrrolidone;

Can generate tetrahydrofuran;

Can react with SO3 ChengDing lactone - alpha - sulfonic acid;

Can react with NaCN generated 2 - piperidine ketone;

Glutaric acid can react with CO formation;

Can be generated by reaction with NaOH 4, 4 - oxygen generation of succinic acid;

Can react with Na2S generate sulfur brace succinic acid;

Can react with NA2SO3 to generate gamma sulfo sodium butyrate.

1、*-丁内酯广泛用作香料和医药中间体。作为一种高沸点溶剂，溶解性强，性能稳定性好，使用安全。作为质子型强溶剂，能溶解大多数低分子聚合物和聚合物，可用作电池电解液，代替腐蚀性酸。在聚合反应中可作为载体参与聚合。可用于吡咯烷酮、丁酸、丁二酸，用于油漆药水，在医药、香料等精细化学品的合成中应用非常广泛。树脂也常用作溶剂，是一种高/低毒安全、环保的溶剂。在聚氨酯领域，用于聚氨酯粘度调节剂（反应性稀释剂），聚氨酯（pu）和氨基涂料体系的固化剂。