Rhodium-containing hydrogenation catalysts for the conversion of methacycline to doxycycline

Rhodium hydrogenation catalysts particularly for stereoselective hydrogenation of methacycline to doxycycline

Homogeneous catalytic system for hydrogenation of methylenetetracyclines and a process for the preparation of same

Novel process for the preparation of steroidal esters

Rhodium hydrogenation catalyst

Preparation and use of new solvates of beclomethasone 17,21-dipropionate

9.alpha.-Fluoro or 9.alpha.-chloro corticosteroid esters

.alpha.-Deoxytetracyclines

Rhodium-containing catalysts and their application