By reacting the compound of the formula [Ia] or [Ib] with halosilane compound and an agent for diazo reaction, 2,6-dihalopurine of the formula [II] can be produced conveniently in a high yield and can be easily isolated, wherein each symbol is as defined in the specification ##STR00001##

 
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> Processes of making .gamma.,.delta.-unsaturated carboxylic acid and silyl ester thereof, carboxyl group-containing organosilicon compound and process of making

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