Novel process for the preparation of...

C - Chemistry – Metallurgy – 07 – F

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C07F 5/02 (2006.01) C07C 29/143 (2006.01) C07D 215/14 (2006.01) C07D 215/18 (2006.01) C07D 495/04 (2006.01)

Patent

CA 2195776

The present invention relates to an improved process for the in situ preparation of diisopinocampheylchloroborane which comprises reacting sodium borohydride and boron trichloride with .alpha.-pinene. The diisopinocampheylchloroborane thus obtained may be used, without isolation, to reduce prochiral ketones to their corresponding alcohols in high optical purity.

Nouveau procédé de préparation in situ du diisopinocamphéylchloroborane consistant à faire réagir de l'hydrure de bore et du trichlorure de bore avec une alpha -pinène. Le diisopinocamphéylchloroborane ainsi obtenu peut servir, sans devoir être isolé, à réduire les cétones prochirales à leur alcools correspondants de grande pureté optique.

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