公开(公告)号：US3925422A

公开(公告)日：1975-12-09

申请号：US33624373

申请日：1973-02-27

Applicant: STAMICARBON

Inventor： SCHAAFSMA SIJBRANDUS E ,  DEUMENS JOHANNES J M

IPC: C07D311/74

CPC classification number: C07D311/74

Abstract: A process for preparing 3,4,5,6,7,8-hexahydrocoumarin is disclosed, wherein 2-( Beta -carboxyethyl)-cyclohexanone is heated in the presence of catalytic amount of a strong acid having a atmospheric boiling point above 200*C at a temperature of 140*-245*C and a pressure of 6-200 mm Hg. The hexahydrocoumarin product may be dehydrogenated to form dihydrocoumarin which is used in the perfume industry.

Abstract translation: 公开了一种制备3,4,5,6,7,8-六氢香豆素的方法，其中2-（β-羧乙基） - 环己酮在催化量的常压沸点高于200℃的强酸存在下被加热 温度为140〜-245℃，压力为6〜200mmHg。