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七、不饱和羰基化合物的还原用黄鸣龙法还原桂皮醛7-1或呋喃甲醛7-3等α,β-不饱和醛时,得到还原产物7-2和7-4,产率75％。但在还原α,β-不饱和酮7-5时,所得却为吡唑啉化合物7-6,而从7-7却得环丙烷化合物7-9~[6,25]。后者的产生,可能是由于7-7也先变成吡唑啉化合物7-8,然后分解得7-9。至于7-6则由于沸点较低(160℃),回流时的温度不足以使其分解为环丙烷化合物。
Reduction of Unsaturated Carbonyl Compounds The reduction products 7-2 and 7-4 were obtained in a yield of 75% by reducing the α, β-unsaturated aldehyde such as cinnamaldehyde 7-1 or furfural 7-3 by the Huang Ming Long method. However, when the α, β-unsaturated ketone 7-5 is reduced, the obtained pyrazoline compound 7-6 is obtained from 7-7 but the cyclopropane compounds 7-9 to [6,25] are obtained. The latter is probably due to the fact that 7-7 also becomes pyrazoline compound 7-8 and then decomposes 7-9. As for 7-6, due to the lower boiling point (160 ° C), the temperature at reflux was insufficient to decompose it into cyclopropane compounds.