| 摘要 |
1,216,692. Esters of dienals. UGINE KUHLMANN. 7 Feb., 1968 [8 Feb., 1967], No. 6136/68. Heading C2C. Carboxylic diesters of 1,5-hexadiene 1,6-diols having the formula where R<SP>1</SP> is an alkyl, alkenyl, cycloalkyl, aryl or heterocyclic radical containing from 1 to 12 carbon atoms, are prepared by heating the corresponding carboxylic diester of 1,5-hexadiene 3,4-diol. The reaction may be carried out in either the liquid or gas phase, preferably in the presence of a polymerization inhibitor such as hydroquinone, monomethyl ether of hydroquinone, t-butyl catechol, p-phenylenediame or a copper salt. Examples describe the preparation of 1,6-diacetoxy 1,5-hexadiene and 1,6-di-isobutyryloxy 1,5-hexadiene. |
