Preparation of steroids

Separation of .alpha.-6-deoxytetracyclines from reaction mixtures

Tetracycline derivatives

Doxycycline alkali metaphosphate complexes

Doxycycline alkali metal polyphosphate complex with improved pharmacological properties

Corticosteroid 21-sulfate and phosphate esters

alpha.-6-Deoxytetracyclines from anhydrotetracyclines

Betamethasone

Biological transformation of anhydrotetracyclines to 6-deoxytetracyclines

Antibiotic tetracycline complexes

16.beta.-Methyl-9.alpha.-fluoro steroids

Corticosteroid 21-sulfates and 21-phosphates