Aripiprazole lauroxyl comprising reacting 1- (hydroxymethyl) aripiprazole with lauric acid in the presence of a suitable solvent and optionally with a carboxyl activator in the presence of a suitable base. Preparation method is provided. -(Hydroxymethyl) aripiprazole can be prepared by reacting aripiprazole or its hydrate with paraformaldehyde in the presence of a suitable organic solvent and a suitable base, the reaction of which is water as a solvent in the reaction mixture. It is done without addition. See also (7- (4- (4- (2,3-dichlorophenyl) piperazine-1-yl) butoxy) -3,4-dihydro-2-oxoquinoline-1 (2H) -yl) methylformates. Provided as standard.
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