Photochemical process for the production of previtamin D3

Precursors of the A-ring of vitamin D and method and...

Preparation of 1.alpha., 24-dihydroxyvitamin D analogs

Preparation of 19-nor vitamin D compounds

Preparation of 19-Nor-vitamin D compounds

Process and intermediates useful to produce vitamin D analogs

Process for producing phosphineoxide vitamin D precursors

Production of novel vitamin D.sub.3 derivatives

Radioisotope iodine-labeled 1.alpha. (or 24R), 25-dihydroxy vita

Synthesis of 1.alpha.-hydroxy-secosterol compounds

Synthesis of 19-nor vitamin D compounds

Synthesis of C.sub.18 -modified vitamin D compounds and compound

Therapeutically effective 1&agr;, 25-dihydroxyvitamin D3...

Therapeutically effective 1.alpha.,25-dihydroxyvitamin D.sub.3 a

Vitamin D analogs and methods of preparing these compounds

Vitamin D analogues

Vitamin D analogues

Vitamin D analogues

Vitamin D analogues

Vitamin D compound, method of preparing this compound and interm