Hj. Cristau et al., SYNTHESIS AND REACTIVITY OF A NEW 1,1-DIPHENYL 2,5-DIHYDROPHOSPHOLIUMSALT, Phosphorus, sulfur and silicon and the related elements, 89(1-4), 1994, pp. 163-171
We describe the first synthesis of an unsatured cyclic diphenyl phosph
onium salt of type 2, the 1,1-diphenyl 2,5-dihydrophospholium salt 2d.
The method involves a cycle-addition of the diphenyl halophosphine to
the corresponding diene. The salt 2d allowed the access to interestin
g alkadienyl phosphine oxides 4 and trienes 6.