A process for the purification of roxithromycin crystallization of methanol

Preparation of azithromycin dihydrate

A process for the preparation of 4-(des-dimethylamino)-tetracyclines

One-pot preparation of azithromycin

Process for the purification and crystallization of iopamidol using propanols

Process for simultaneous recovery of precious metals and tertiary phosphine from spent catalysts using tellurium

Process for the preparation of a rhodium complex

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

Rhodium hydrogenation catalysts particularly for stereoselective hydrogenation of methacycline to doxycycline

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