| abstract |
A titanium catalyst for use in the reaction between unsaturated carbon-to-carbon bonds and a compound having an electrophilic functional group or an electrophilic agent, which catalyst comprises a titanium compound represented by the general formula (1): TiX1X2X3X4 (wherein X?1, X2, X3 and X4¿ represent each independently halogeno, C¿1?-C20 alkoxy, aralkyloxy, aryloxy or -NRxRy (wherein Rx and Ry represent each independently C1-C20 alkyl or aralkyl), or alternatively any of X?1, X2, X3 and X4¿ may form a ring together with the other of them) and 1.5-2.5 times by mole as much Grignard reagent represented by the general formula (2): R1MgX5 (wherein R1 represents C¿2?-C10 alkyl having a hydrogen atom at the β-position; and X?5¿ represents halogeno). |