REACTIONS OF CYCLOOCTATETRAENE AND ITS DERIVATIVES .8. 1,2,3,8-TETRACHLOROCYCLO-OCTATETRAENE AND 1,2,3,4-TETRACHLOROCYCLO-OCTATETRAENE

被引:4
作者
ATKINS, RJ [1 ]
FRAY, GI [1 ]
机构
[1] UNIV BRISTOL,SCH CHEM,BRISTOL BS8 1TS,AVON,ENGLAND
关键词
D O I
10.1016/S0040-4020(01)93742-1
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Earlier attempts to synthesize 1,2,3,8-tetrachlorocyclo-octatetraene 4 are described. A ca. 2:1 mixture of 1,2,3,8- and 1,2,3,4-tetrachlorocyclo-octatetraene was finally obtained by hydrolysis (using 96% trifluoroacetic acid) of the ketal 15 followed by thermal decarbonylation of the product. Reaction of the mixture of cyclo-octatetraenes with bromine gave the (separable) dibromo-derivatives 17 and 18. On attempted debromination with zinc, the dibromodiene 17 formed the benzocyclobutadiene dimer 12, together with the benzobiphenylene 13; these compounds were also produced directly from the cyclo-octatetraene mixture by the action of zinc. In contrast, similar treatment of the dibromodiene 18 led to the E-bromostyrene 22. The mixture of cyclo-octatetraenes reacted with maleic anhydride to give the adduct 27, whereas with acenaphthylene the adduct 28 was obtained. © 1979.
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页码:1177 / 1181
页数:5
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