sentences:  The generally accepted reaction mechanism initially utilizes two successive stages of transmetallation of the committed Grignard reagent, leading to an intermediate dialkyldiisopropyloxytitanium complex.This complex undergoes a dismutation to give an alkane molecule and a titanacyclopropane 1.The insertion of the carbonyl group of the ester in the weakest carbon-titanium bond leads to an oxatitanacyclopentane 2 being rearranged to ketone 3.