SYNTHETIC INVESTIGATIONS ON STEROLS, BILE ACID, HORMONE, ETC.PART IV. SYNTHESIS OF 9-KETO-2 : 13-DIMETHYL-Δ10-1 : 2-CYCLOPENTANO PERHYDROPHENANTHRENE

A synthesis of cyclopentanoporhydrophenanthrene derivative with the angular methyl groups in proper position has been described. Possibility of the formation of vitamin-D2 ring system from the above perhydrophenanthrene derivative has also been indicated