Scope of chemical fixation of carbon dioxide catalyzed by a bifunctional monomeric tungstate

详细信息    查看全文

• 作者：Keigo Kamata ; Toshihiro Kimura ; Hanako Sunaba ; Noritaka Mizuno ; ^{tmizuno@mail.ecc.u-tokyo.ac.jp" class="auth_mail}
• 关键词：Carbon dioxide fixation ; Homogeneous catalysis ; Tungstate
• 刊名：Catalysis Today
• 出版年：1 May, 2014
• 年：2014
• 卷：226
• 期：Complete
• 页码：160-166
• 全文大小：2479 K

文摘

The tungsten-oxo moiety in a simple monomeric tungstate, TBA₂[WO₄] (rong class="boldFont">Irong>, TBA = tetra-n-butylammonium), showed bifunctional activation of both CO₂ and 1,2-phenylenediamine (rong class="boldFont">1arong>). It was confirmed by ¹H, ¹³C, and ¹⁸³W NMR spectroscopies that adducts rong class="boldFont">I-1arong> and rong class="boldFont">I-(COrong>_{rong class="boldFont">2rong>}rong class="boldFont">)rong>_{rong class="boldFont">nrong>} (n = 1 and 2) were formed by the reactions of rong class="boldFont">Irong> with rong class="boldFont">1arong> and CO₂, respectively. These adducts played important roles in formation of the corresponding carbamic acid intermediates. The present bifunctionality could be applied to chemical fixation of CO₂ even at atmospheric pressure with various kinds of structurally diverse aryl diamines, primary monoamines, propargylic alcohols, and propargylic amines into cyclic urea derivatives, 1,3-disubstituted urea derivatives, cyclic carbonates, and cyclic carbamates, respectively.