以价廉易得的铝粉还原四氯化钛制得低价钛,将其用于醛酮还原偶联,合成了6种片呐醇,其中对称片呐醇4种,不对称片呐醇2种.采用分级结晶法分离得到苯甲醛片呐醇的内消旋体(meso)和外消旋体(d,l),利用波谱分析确定了其结构.通过对比实验着重讨论了反应条件对产物的影响.推断了反应机理,并做了定性解释 The titanium tetrachloride was prepared by cheap and cheap aluminum powder, which was used for the reductive coupling of aldehydes and ketones. Six kinds of phenols were synthesized, including 4 symmetric phenols, asymmetric phenols Two kinds of meso and racemate (d, l) of benzaldehyde pinacol were isolated by fractional crystallization method, and their structures were confirmed by spectral analysis.Comparison experiments focused on the reaction conditions The influence of product was deduced, the reaction mechanism was deduced, and the qualitative explanation was made