Synthesis of a doubly complexed bisphosphirenyl ether and generation of phosphirenylium cations complexed with pentacarbonyltungsten

Reaction of the 1-beta-chloroethyl-substituted 1H-phosphirene complex 2 wit h silver salts results in formation of the acceptor-substituted 1H-phosphir ene complexes 3; decomposition of the latter furnishes the doubly complexed bisphosphirenyl ether 4. Treatment of the acceptor-substituted 1H-phosphir ene complexes 3 or, respectively, the bisphosphirenyl ether 4 with the stro ng Lewis acid boron tris(trifluoromethanesulfonate) leads to the correspond ing salts 6 or 7 of the pentacarbonyl-tungsten-substituted phosphirenylium cation.