A Novel Synthesis of Allylic Alcohols with Defined Stereochemistry acetylenes displayed a strong absorption at-970 cm-l, indicating the presence of a trans disubstituted olefinic linkage. 4 Consequently, it is highly probable that all of the reactions proceed with retention of configuration. In one case, this conclusion was tested by comparing the Summary: B- A1keny1-9-BBN derivatives add across the responding allylic alcohols with the ...