Dsm IP Assets B.v.

Abiogen Pharma S.p.a.

Kesheng Zhang

Michael Roeder

Alexander Schlifke-Poschalko

Stefano Luca Giaffreda

Fabio Neggiani

Serena Fabbroni

Michel Chiarucci

Laura Dini

Barbara Politi

Alex Petrolati

Michael Preschel

The present invention relates to a novel crystalline hemihydrate polymorph of neridronic acid sodium salt, and a novel process for the preparation thereof comprising the steps of: 1) dissolving solid sodium neridronate in any crystalline form in water, at a temperature in the range from 70 to 90&#xb0; C., to obtain an aqueous solution of sodium neridronate; 2) adding a solvent selected from the group consisting in ethanol, 1-propanol, and 2-propanol to the aqueous solution obtained from step (1), so that the final water:solvent volume ratio is in the range from 1:0.5 to 1:1, thus obtaining a suspension; 3) placing the suspension obtained from step (2) under mechanical stirring, at a temperature in the range from 60 to 95&#xb0; C.; 4) recovering the crystalline hemihydrate form F of sodium neridronate formed in the previous step (3). The crystalline hemihydrate form F of sodium neridronate, particularly stable, may be employed in the preparation of solid oral pharmaceutical forms for use in the treatment of musculoskeletal and calcium metabolism disorders.

Polymorph of sodium neridronate and preparation process thereof

The invention relates to an improved process for the manufacture of novel benzotriazoles as well to novel benzotriazoles obtained by the novel process. This novel economical process provides products in high purity and yields. 

Process to make UV radiation absorbing 2-phenyl-1,2,3,-benzotriazoles

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Lenzburg, Switzerland

Kesheng Zhang