申请人:Union Carbide Corporation
公开号:US04639536A1
公开(公告)日:1987-01-27
2,3-Dihydro-2,2-dimethyl-7-hydroxybenzofuran is prepared by reacting catechol with isobutylene oxide or with a compound having the general formula ##STR1## wherein R is halogen or hydroxyl, and X is halogen, in the presence of a base to form the intermediate 2-(2-hydroxy-2-methylpropoxy) phenol and then thermally dehydrating, rearranging and cyclizing the resulting intermediate phenol in the presence of an acid catalyst to form 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran.
2,3-二氢-2,2-二甲基-7-羟基苯并呋喃是通过将邻苯二酚与异丁烯氧化物或具有一般式##STR1##其中R是卤素或羟基,X是卤素,存在碱的情况下反应生成中间体2-(2-羟基-2-甲基丙氧基)苯酚,然后在酸催化剂的存在下热力脱水、重排和环化生成2,3-二氢-2,2-二甲基-7-羟基苯并呋喃。