中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
3-乙酰氧基丙酸 | 3-acetoxypropionic acid | 4272-12-2 | C5H8O4 | 132.116 |
b -Acyloxy acyl halides of the general formula <;FORM:0649508/IV (b)/1>; where Ac is an acyl radical <;FORM:0649508/IV (b)/2>; , R1 being a hydrocarbon radical, X is a halogen atom and R is hydrogen or an alkyl radical are prepared by reacting an acyl halide with a saturated aliphatic b -lactone. Preferably an equimolecular proportion or less of the b -lactone is added to the acyl halide at a temperature of from - 30 DEG to 30 DEG C. A solvent may be present. Specified acyl halides are acetyl, propionyl, caproyl, lauroyl, stearoyl, acrylyl, benzoyl and phenyl acetyl chlorides. Bromides and iodides may also be used. Halides of dibasic acids such as succinic and phthalic react with two molecular proportions of b -propiolactone to give a b -succinoxy or b -phthaloxy dipropionyl chloride. In an example, b -propiolactone reacts with acetyl chloride to give b -acetoxy propionyl chloride. The compounds of the invention react with ammonia and alcohols to form amines and esters. Specification 649,028 is referred to. Beta-lactones are prepared by reacting ketene with an aldehyde or ketone. The Specification as open to inspection under Sect. 91 comprises also the use of acyl halides containing halogen and nitrogen atoms, the use of lactones which contain cycloalkyl aryl and aralkyl substituents or lactones of dicarboxylic acids or lactones containing nitrogen oxygen or sulphur atoms. Lactones mentioned of this type to be used as starting materials comprise alpha- or beta-nitrophenyl-beta-propiolactone; beta-(o-nitro-m-chlorophenyl)-beta-propiolactone; beta - (o - nitro - m - methoxyphenyl) - beta - propiolactone; alpha - hydroxy - beta - phenyl - beta - propiolactone, and alpha bromo-beta-beta-dimethyl-beta-propiolactone-alpha carboxylic acids. Also the condensation of the products with further quantities of the lactone to give polymeric derivatives. This subject-matter does not appear in the Specification as accepted.;FORM:0649508/IV>;FORM:0649508/IV>