作者:Paul Margaretha
DOI:10.1002/hlca.19760590232
日期:1976.3.10
Irradiation (λ > 370 nm) of 4,4-dimethoxy-2,5-cyclohexadienone (1 a) in benzene affords mainly the ketene acetal 4 a, which then undergoes further rearrangement. The carbomethoxycyclopentenones 6 and 7 were isolated in modest yields (10–15°). It is conceivable that the latter results from decomposition of the unobserved bicyclohexenone 5 a, the formation of which could be expected by analogy to e.g
照射4,4-二甲氧基-2,5-环己二烯酮的(λ> 370nm的)(1)的苯,得到主要的乙烯酮乙缩醛4,其然后经历进一步的重排。碳甲氧基环戊烯酮6和7的分离产率中等(10-15°)。可以想象的是,后者是由未观察到的双环己烯酮5a分解产生的,类似于例如1c 5c,可以预期其形成。化合物4据推测形成通过从中间两性离子1,2-氢转移3。在类似的辐射条件下,1,4-二氧杂螺[4.5] deca-6,9-dien-8-one(1 b)给出4 b作为唯一可定义的产物。在i -C 8 H 18 1 a中,最有可能通过夺氢得到了对甲氧基苯酚(8)作为唯一产物。