D1-13β-Alkyl-3-alkoxy-11β-methylgona-1,3,5(10)-triene-17&bet a;-ol was prepd. by treating 6-alkoxy-3,4-dihydro-1(2H)-naphthalenone with dialkylaminomethylvinylic organometallic reagent to give I, followed by reaction of quaternary ammonium salt, 6-alkoxy1-dialkylaminomethlvinyl-3,4-dihydronaphthalene produced by dehydrating and quaternizing I with 2-alkylcyclopentane-1,3-dione to obtain II and reducign III produced by reacting II with a proton, and then cyclizing.
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