4,8-Dichloro- and 5,7-dichloro-2,10-dihydroxydicyclohepta[b,d]furan-3,9-diones were synthesized. Although the latter could be obtained by condensation of 4-chloro-p-tropoquinone and its hydroquinone, the former required the hydrolysis of condensate of 3-chloro-p-tropoquinone and 7-chloro-5-hydroxy-2-methoxytropone. This mixed condensation led to several unsymmetrically substituted derivatives in improved yields.
合成了 4,8-二
氯和 5,7-二
氯-2,10-二羟基二环庚并[b,d]
呋喃-3,9-二
酮。虽然后者可以通过 4-
氯-对-丙醌及其
对苯二酚的缩合获得,但前者则需要
水解 3-
氯-对-丙醌和 7-
氯-5-羟基-
2-甲氧基托
酮的缩合物。通过这种混合缩合反应,可以得到几种非对称取代的衍
生物,而且产量有所提高。