公开(公告)号：US20190308954A1

公开(公告)日：2019-10-10

申请号：US16347414

申请日：2017-10-27

Applicant: BASF SE

Inventor： Eric George KLAUBER ,  Birgit GOCKEL ,  Sebastian SOERGEL ,  Roland GOETZ ,  Henricus Maria Martinus BASTIAANS, I ,  Jochen DIETZ ,  Joachim GEBHARDT

IPC: C07D403/12

Abstract: The present invention relates to a process for the purification of pyrazolpyridazines of formula I wherein the variables are as defined in the specification, by adding HCl to a solution of the pyrazolpyridazine in an inert solvent under non-aqueous conditions, effecting crystallization of the HCl-salt, isolating the resulting precipitate.