- 作者: 張德洲
- 作者服務機構: Department of Chemical Engineering, Chung Yuan Christian College of Science and Engineering, Chung-Li, Taiwan 320
- 中文摘要: The mixture of dl-menthyl chloroacetate isomers and the mixture of dl-menthyl cyanoacetate isomers were prepared by the esterification of the mixture of dl-menthol with chloroacetic acid and cyanoacetic acid, respectively. In these mixtures the dl-menthyl chloroacetate m. p. 23-24° and the dl-menthyl cyanoacetate m. p. 63-63.5° are crystal form, the other isomers, such as dl-isomenthyl cyanoacetate b. p. 136-138°/3mmHg are liquid form. The crystal form ester was isolatded from liquid form ester by cooling crystallization, and then dl-menthol m. p. 32-33° was obtained by hydrolysis. The isolation effect has intimately relation to the dl-menthol content in raw material, the more dl-menthol content, the more yield and purity of crystal form ester, therefore, after hydrolysis, the obtained dl-menthol was excellent in purity.
- 英文摘要: --
- 中文關鍵字: --
- 英文關鍵字: --