7-Chloro-2-chloromethyl-benzofuran (13) and 3, 8-dichloro-2 H-1-benzopyran (12) are the main products from the thermal rearrangement (230–260°) of 2, 6-dichlorophenyl propargyl ether (7). Compounds 17, 18 and 19 are also formed, but in much smaller amounts (scheme 2 and table 1). However, in the case of the bromo-compounds 8 and 9 the rearrangement products are the benzofuran derivatives 21 and 22
7-
氯-
2-氯甲基苯并呋喃(13)和3,8-二
氯2 H -1-苯并
吡喃(12)是2,6-二
氯苯基炔丙基醚的热重排(230-260°)的主要产物(7)。化合物17,18和19也被形成,但在更小的量(方案2和表1)。然而,在
溴化合物8和9的情况下,重排产物是
苯并呋喃衍
生物21和22,其每分子少含一个
溴原子(方案4)。