(S)-2-hydroxy-6-methylhept-5-en-1-yl 4-methylbenzenesulfonate

magnesium,2-methylbut-2-ene,chloride

(S)-6-methyl-1-(trityloxy)hept-5-en-2-ol

(S)-6-methylhept-5-ene-1,2-diol

(S)-6-methyl-1-(phenylthio)hept-5-en-2-ol