Piperazine → N-triethoxysilyl-methylpiperazine

참여 물질

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반응 단계

905.3 g (10.5 mol) of piperazine and 945 ml of xylene (anhydrous) as solvent are charged to a 4 liter 4-neck flask and subsequently innertized with nitrogen. The batch is heated to a temperature of 100° C., in the course of which the piperazine dissolves completely. Added dropwise at this temperature are 446.3 g (2.1 mol) of chloromethyltriethoxysilane, over the course of 1 h with thorough stirring. Following the addition of about ⅓ of the amount of silane, piperazine hydrochloride is precipitated as a salt, but the suspension remains readily stirrable until the end of the reaction. After the end of the addition, stirring is continued for a further 15 min. Subsequently the reaction mixture is heated to 110° C. and the precipitated salt is filtered off on a preheated filter.

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