Dihydropyrans I (R = R1 = H, R2 = H, Me, CH2CH2CH:CMe2; R = Me, CH2CHMe2, R1 = H, R2 = Me; R = R2 = H, R1 = CH:CMe2), when treated with LiN(CHMe2)2-KOCMe3, underwent smooth ring cleavage through b-elimination to give dienols (Z)-HOCHRCR1:CR2CH:CH2. Methyle ...
1985