Heterobimetallic dinuclear lanthanide alkoxide complexes Ln2Na8(OCH2CH2NMe2)12(OH)2 [Ln: I (Nd), II (Sm), III (Yb) and IV (Y)] were used as efficient acid–base bifunctional catalysts for the synthesis of carbamates from dialkyl carbonates and amines as well as the N-Boc protection of amines. The cooperative catalysts showed high catalytic activity and a wide scope of substrates with good to excellent
使用异双金属二核镧系醇盐配合物Ln 2 Na 8(OCH 2 CH 2 NMe 2)12(OH)2 [Ln:I(Nd),II(Sm),III(Yb)和IV(Y)]作为有效酸碱-双功能催化剂,用于由碳酸二烷基酯和胺以及N合成氨基甲酸酯-胺的Boc保护。助催化剂在无溶剂条件下显示出高催化活性和多种底物,具有良好或优异的收率。由于路易斯酸中心与布朗斯台德碱性中心之间的显着协同作用,该系统显示出更高的催化活性。还研究了单核和双核异双金属镧系元素烷氧化物类似物的催化效率的比较。
N-Substituted carbamate synthesis using urea as carbonyl source over TiO<sub>2</sub>–Cr<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> catalyst
作者:Peixue Wang、Yubo Ma、Shimin Liu、Feng Zhou、Benqun Yang、Youquan Deng
DOI:10.1039/c5gc01007a
日期:——
The synthesis of N-substituted carbamates from amines, urea and alcohols over a TiO2–Cr2O3/SiO2 catalyst.
从胺、尿素和醇在TiO2–Cr2O3/SiO2催化剂上合成N-取代的碳酸酯。
N-substituted carbamates syntheses with alkyl carbamates as carbonyl source over Ni-promoted Fe3O4 catalyst
作者:Jianpeng Shang、Xiaoguang Guo、Feng Shi、Yubo Ma、Feng Zhou、Youquan Deng
DOI:10.1016/j.jcat.2011.01.030
日期:2011.4
magnetic iron oxide containing Ni with different nickel content were prepared with co-precipitation method and tested in the syntheses of N-substitutedcarbamates from various amines and alkyl carbamates. Under the optimized reaction conditions, various N-substitutedcarbamates were successfully synthesized with 90–98% isolated yield. The catalyst could be recovered based on the magnetic property of the catalyst
Alkylenedioxythiophenes and poly(alkylenedioxythiophene)s having urethane-containing side groups
申请人:——
公开号:US20030216540A1
公开(公告)日:2003-11-20
The present invention relates to alkylenedioxythiophenes of the formula I having urethane-containing side groups
1
to their preparation and to their oligo- and polymeric derivatives (oligo- and poly(alkylenedioxythiophene)s).
Photographic coupler and silver halide color photographic material
申请人:FUJI PHOTO FILM CO., LTD.
公开号:EP0571959A2
公开(公告)日:1993-12-01
A 1H-pyrazolo[1,5-b][1,2,4]triazole magenta coupler having a t-alkyl group at the position-6 and an amido group-substituted phenyl group at the position-2 is disclosed. There is also disclosed a silver halide color photographic material containing the same.