Process for the preparation of new rhodium-containing...

Details Process for the preparation of new rhodium-containing... Process for the preparation of new rhodium-containing...

C - Chemistry, Metallurgy

07

F

260/429.4, 260/2

C07F 15/00 (2006.01) B01J 31/18 (2006.01) B01J 31/24 (2006.01)

Patent

CA 1218058

ABSTRACT A process for the preparation of new stable homogeneous hydrogenation catalysts, comprising the reaction of a rhodium salt or complex with a hydra- zine, or a salt thereof, eventually in the presence of excess tertiary phosphi ne, and their application in very reduced quantities in improved processes for the stereoselective hydrogenation of 6-deoxy-6-demethyl-6-methylenetetracycli nes and for the simultaneous dehalogenation and stereoselective hydrogenation of 11a-chloro-6-deoxy-6-demethyl-6-methylenetetracyclines, to furnish .alpha.-6-deo xy-tetracyclines in high yields and purities.

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