1,2-Dimethoxybiphenylene reacted with dichlorocarbene to give three chloro(methoxy)-6H-benzo[3,4]cyclobuta[1,2]cyclohepten-6-one derivatives, two chloro(methoxy)fluorenones and two dimethoxyfluorenones. The reaction with dibromocarbene gave similar products. The formation of these products serves as unequivocal chemical evidence for bond fixation of 1,2-dimethoxybiphenylene. The chloro(methoxy)-6H-benzo[3,4]cyclobuta-[1,2]cyclohepten-6-one was led to 9-chloro-5-hydroxy-6H-benzo[3,4]cyclobuta[1,2]cyclohepten-6-one, the first tropolone analogue of biphenylene. This compound was shown to exist in only one of the two possible tautomers in contrast with general monocyclic tropolones.
1,2-二甲氧基联亚苯基与二
氯卡宾反应,得到三个
氯(甲氧基)-6H-苯并[3,4]环丁[1,2]
环庚烯-6-酮衍
生物、两个
氯(甲氧基)
芴酮和两个二甲氧基
芴酮。与二
溴卡宾反应得到类似的产物。这些产物的形成是 1,2-二甲氧基联亚苯基键固定的明确
化学证据。
氯(甲氧基)-6H-苯并[3,4]环丁-[1,2]
环庚烯-6-酮转化为9-
氯-5-羟基-6H-苯并[3,4]环丁[1,2 ]cyclohepten-6-one,
联苯撑的第一个托
酚酮类似物。与一般单环
托酚酮相比,该化合物仅存在两种可能的互变异构体之一。