Activation of 2-propyn-1-ols by the rhenium(I) fragment [{MeC(CH2PPh2)3}Re(CO)2]+. Synthesis and characterization of cationic Re(I) complexes containing unsaturated η1-carbon ligands

The [{MeC(CH2PPh2)3}Re(CO)2]+ auxiliary has been found to activate 1-ethynyl-1-cyclohexanol and 1-phenyl-2-propyn-1-ol yielding a variety of η1-carbon ligands, which includes hydroxyvinylidene, alkenylvinylidene, alkoxycarbene, η1-Csp-enynyl, secondary allenylidene, acyl, hydroxycarbene and alkoxycarbene groups. The reactivity of the allenylidene complex [{MeC(CH2PPh2)3}Re(CO)2{CCC(H)Ph}]+ toward water and methanol has been investigated.