Efficient preparation of carbamates by Rh-catalysed oxidative carbonylation: unveiling the role of the oxidant
作者:Amaia Iturmendi、Manuel Iglesias、Julen Munárriz、Victor Polo、Jesús J. Pérez-Torrente、Luis A. Oro
DOI:10.1039/c6cc09133d
日期:——
The synthesis of a broad variety of carbamates from amines, alcohols and carbon monoxide has been achieved by means of a Rh-catalysed oxidative carbonylation reaction that uses Oxone as stoichiometric...
N-arylcarbamates under mild conditions for the first time. Although being weakly coordinating, N-arylcarbamates act very well as a removable directing group for activation of C–H bonds. The developed procedure results in extremely valuable halogenated N-arylcarbmates that can further be hydrolyzed to halogenated anilines. The obtained reaction conditions showed broad scope and wide functional group tolerance
Reversible double insertion of aryl isocyanates into the Ti–O bond of titanium(IV) isopropoxide
作者:Rajshekhar Ghosh、Munirathinam Nethaji、Ashoka G. Samuelson
DOI:10.1016/j.jorganchem.2004.11.038
日期:2005.3
The insertion of phenyl isocyanate into titanium isopropoxide leads to the formation of a dimeric complex [Ti(OiPr)2(μ-OiPr)C6H5N(OiPr)CO}]2 (1) which has been structurally characterized. Reaction of titanium isopropoxide with two and more than 2 equiv. of phenyl isocyanate is complicated by competitive, reversible insertion between the titanium carbamate and titanium isopropoxide. The ligand formed
苯基异氰酸酯的插入异丙醇钛导致的形成的二聚复合物钛[Ti(O我PR)2(μ-O我PR)C 6 H ^ 5 N(0我PR)CO}] 2(1),其已经在结构上得到了表征。异丙醇钛与两个或大于2当量的反应 氨基甲酸钛和异丙醇钛之间竞争性,可逆的插入使异氰酸苯酯的合成变得复杂。通过将异氰酸苯基酯插入氨基甲酸钛中形成的配体已在结构上以其质子化形式C 6 H 5 N C(O i Pr)O} C(O)N(H)C进行了表征6 H 5(3aH)。动力学上有利于氨基甲酸酯的插入,而异丙醇中的热力学上有利的产物。
[Cu<sub>32</sub>(PET)<sub>24</sub>H<sub>8</sub>Cl<sub>2</sub>](PPh<sub>4</sub>)<sub>2</sub>: A Copper Hydride Nanocluster with a Bisquare Antiprismatic Core
作者:Sanghwa Lee、Megalamane S. Bootharaju、Guocheng Deng、Sami Malola、Woonhyuk Baek、Hannu Häkkinen、Nanfeng Zheng、Taeghwan Hyeon
DOI:10.1021/jacs.0c06577
日期:2020.8.12
photophysical and catalytic properties. However, the synthesis of Cu NCs is highly challenging because of low reduction potential and high reactivity of copper, demonstrating the need for new synthetic methods using appropriate ligand combinations. By designing a diamine-assisted synthetic strategy, here we report the synthesis and total structure characterization of a box-like dianionic Cu NC, [Cu