“…The decomposition temperature is a minimum when R = Bun and Z = P; oct-l-ene of 95% purity is obtained from the octyl ester. 83 The product obtained by dehydrating an alcohol over alumina depends on the isomerising properties of the alumina, which are at a minimum when alkali is present .a4 Conjugated polyenes are obtained from 1,5-enynes by means of potassium t-butoxide,85 e.g., hex-l-en-5-yne forms hexa-1,3,5-triene (40%; as against 4% by use of ethanolic potassium hydroxide). Potassium t-butoxide is equally effective in converting 1,5-diynes into conjugated enynes, e.g., hexa-l,5-diyne is converted into hexa-l,3-dien-5-yne, whereas ethanolic potassium hydroxide converts it into hexa-2,4-diyne.…”