The organometallic compound of the present invention may be prepared by the following procedure: (i) an alkyl compound of a Group 13 element(R3 M') is reacted with an alcohol(R'OH) or an alkoxide of the same element(M'(OR')3) to obtain a dialkylmetal alkoxide(R2 M'OR'); (ii) the dialkylmetal alkoxide is reacted with an alkali metal alkoxide(MOR' wherein M is an alkali metal such as Li, Na or K)