Darstellung und Eigenschaften von und Reactionen mit metallhaltigen Heterocyclen. LXXII. Rutheniumhalgite Praekatalysatoren als Speicher fuer reaktive Zwischenstufen bei der katalytischen Cyclotrimerisierung von Alkinen

Article abstract of DOI:10.1016/0022-328X(91)83110-P

(η²-C2H4)Ru(CO)4 (1) reacts with the activated alkynes ZC<*>CZ (2a-c, e, g) to give the tricyclic compounds 3a-c, e, g containing two tricarbonylruthenacyclopentadiene rings.The tendency of formation and the yield of 3a-c, e, g is dependent on the steric demand of the substituents R. 3a-c, e, g are precatalysts for the cyclotrimerization of 2a-c, e, g to the benzene derivatives 4a-c, e, g.In the same way 3a cyclotrimerizes 2b, c, e-h (2h: HC<*>CCO2CH3) to 4b, c, e-h.