A compound having three sp2 centers in the bicyclo[2.2.0]hexane skeleton, viz. hydrocarbon (1), has been synthesized as shown (R = CO2Me → CH2OH → CH2OTs). Thermolysis transforms (1) into 5-methylene-1,3-cyclohexadiene, a model system for polymerization studies.
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Hasselmann et al. (1978) studied this question.
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