SELECTIVE REDUCTION OF CITRAL BY MEANS OF PLATINUM-OXIDE PLATINUM BLACK AND A PROMOTER. XII1
SELECTIVE REDUCTION OF CITRAL BY MEANS OF PLATINUM-OXIDE PLATINUM BLACK AND A PROMOTER. XII1
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DOI：
10.1021/ja01413a026
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发表时间：
1926-02
影响因子：
15
通讯作者：
R. Adams;B. S. Garvey
中科院分区：
文献类型：
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作者：
R. Adams;B. S. Garvey
在醛的催化还原中使用铁盐作为铂-氧化物铂黑的促进剂最近已应用于还原α，β-不饱和醛，肉桂醛。[11]人们发现，在烯烃键被攻击之前，可以首先将醛基完全还原成醇，尽管其他催化方法使烯烃的还原发生在醛之前。本文研究了柠檬醛的还原反应，以确定其它β-不饱和醛的还原过程是否可以通过中毒或促进催化剂来直接和控制。Enklaar [3]用镍作催化剂，在130-140 ℃下，得到香叶醇（Ⅱ）、香茅醇（Ⅲ）、烃和环醇的混合物。甚至用铜作为催化剂得到更复杂的混合物。Skita 4用胶体钯还原得到香茅醛、香茅醇和相当数量的双分子醛的混合物，它们与其它α-不饱和醛的还原产物类似。
The use of an iron salt as a promoter to platinum-oxide platinum black in the catalytic reduction of aldehydes has recently been applied to the reduction of an< x,/3-unsaturated aldehyde, cinnamic aldehyde. 11 It was found possible to reduce the aldehyde group first and completely to an alcohol before the olefin linkage was attacked, although other catalytic methods caused the reduction of the olefin to take place before the alde-hyde. This paper describes a study of the reduction of citral in order to determine whether the course of the reduction of other,/3-unsaturated aldehydes may be directed and controlled by poisoning or promoting the catalyst.No satisfactory reducing reagents otherthan catalytic have been used with citral. Enklaar, 3using finely divided nickel as a catalyst with tem-peratures of 130-140, obtained a mixture of geraniol (II), citronellol (III), a hydrocarbon and cyclic alcohol. Even a more complex mixture was obtained with copper as a catalyst. Skita4 using colloidalpalladium obtained a mixture of citronellal, citronellol and a considerable amount of a dimolecular aldehyde, which are analogous products to those obtained by reductionof other, ß-unsaturated aldehydes.