Reactions of Co2(CO)8 with RC2R′ alkynes part II. Synthesis of Co2(CO)6(RC2R′) complexes; oligomerization or cyclotrimerization reactions of substituted acetylenes
asymmetrically substituted alkynes lead to complexes Co2(CO)6(RC2R′) (1). These catalyze the cyclotrimerization of alkynes to substituted benzenes. Here we report on the synthesis and characterization of some new complexes 1 and on their reactivity with an excess of alkynes in relatively mild conditions; the characterization of new intermediate Co2(CO)4(RC2R′)3 flyover derivatives (complexes 2) and the