Sg. D'Yachkova et al., Alkylthioethynylphosphonium chlorides and their transformation into 2-phosphoranediylethenylidenesulfonium chlorides, RUSS J G CH, 69(8), 1999, pp. 1247-1249
Alkylthio(chloro)acetylenes react with tertiary phosphines in diethyl ether
at room temperature to form equilibrium mixtures of the corresponding alky
lthioethynylphosphonium chlorides and 2-phosphorane diylethenylidenesulfoni
um chlorides.