Enantio-differentiating hydrogenation of methyl acetoacetate over modified Raney nickel catalysts prepared by two-step modifications

被引：1
|
作者：
Tsutomu Osawa
Kenji Yoshino
Kosuke Takimoto
Osamu Takayasu
Tadao Harada
机构：
[1] University of Toyama,Faculty of Science
[2] Ryukoku University,Faculty of Science and Technology
来源：
Catalysis Letters | 2006年 / 112卷
关键词：
tartaric acid-sodium bromide-modified Raney nickel; modification; pre-modification; two-step modification; enantio-differentiating hydrogenation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Two-step modifications of the Raney nickel were examined for the enantio-differentiating hydrogenation of methyl acetoacetate. Among the two-step modifications attempted in this study, the combination of ‘pre-modification with disodium tartrate and NaBr in water’ and ‘in-situ modification with tartaric acid’ resulted in the highest optical yield (84%). This modification process is a greener process than the conventional one carried out under weakly acidic conditions, because this process generated almost no Ni2+ ions. The pre-modification with the tartrate and NaBr preferentially eliminated Al3+ from the Raney nickel surface.
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页码：167 / 171
页数：4
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