CYCLOTRIMERIZATION OF SUBSTITUTED ACETYLENES TO ARENES BY TITANIUM COMPLEXES

Article abstract of DOI:10.1016/S0022-328X(00)98695-9

Cyclotrimerization experiments of substituted acetylenes to arenes with (a) C8H8Ti complexes and with (b) TiCl3 are reported.A cyclotrimerization mechanism is proposed which involves the concerted trimerization of three acetylenes coordinated to a divalent titanium centre.The organometallic compounds isolated from the reaction mixtures, viz. (C8H8TiPhC2Ph)2, C8H8TiC4Ph4 in (a) and ^{- +} in (b) are shown not be intermediates in the cyclotrimerization.