Diels-Alder reactions of the phosphaalkyne 4 with the cyclic 1,3-dienes 5 generate the adducts 6 which decompose spontaneously under elimination of “X ” to yield the λ3-phosphinines 7. The bicyclic 9 decomposes into 7b on flash pyrolysis
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Rösch et al. (1986) studied this question.