نتایج جستجو برای: trimethylsilyl cyanide

تعداد نتایج: 10439  

2016
Zhipeng Zhang Han Yong Bae Joyram Guin Constantinos Rabalakos Manuel van Gemmeren Markus Leutzsch Martin Klussmann Benjamin List

Due to the high versatility of chiral cyanohydrins, the catalytic asymmetric cyanation reaction of carbonyl compounds has attracted widespread interest. However, efficient protocols that function at a preparative scale with low catalyst loading are still rare. Here, asymmetric counteranion-directed Lewis acid organocatalysis proves to be remarkably successful in addressing this problem and enab...

Journal: :Angewandte Chemie 2021

Examples from different research areas of Siegfried Hünig are displayed to remind us that organic chemistry owes much more than Hünig's base this exceptionally versatile and creative chemist. The main lines dealing with the synthesis physical characterization new dyes, multistage redox systems, metals will be presented as well his contributions enamine chemistry, discovery diimine a hydrogenati...

Journal: :Organic & biomolecular chemistry 2014
Kazuya Yamaguchi Konomi Sakagami Yumi Miyamoto Xiongjie Jin Noritaka Mizuno

Thiocyanates and trifluoromethyl sulfides are important compounds and have classically been synthesized via multistep procedures together with the formation of significant amounts of byproducts. Herein, we demonstrate an oxidative nucleophilic strategy for the synthesis of thiocyanates and trifluoromethyl sulfides from thiol starting materials using nucleophilic reagents such as TMSCN and TMSCF...

Journal: :Organic & biomolecular chemistry 2010
Guang-Wu Zhang Dong-Hua Zheng Jing Nie Teng Wang Jun-An Ma

A general method for the one-pot, three-component Strecker reaction of ketones was developed using Brønsted acids as organocatalysts. A series of alpha-aminonitriles were obtained in good to excellent yields (79-99%). A preliminary extension to a catalytic enantioselective three-component Strecker reaction of ketones (up to 40% ee) is also described.

Journal: :Organic & biomolecular chemistry 2011
Ye-Qian Wen Wei-Min Ren Xiao-Bing Lu

A series of unsymmetric salen ligands derived from 1,2-diaminocyclohexane bearing an appended Lewis base on the three-position of one aromatic ring were synthesized by the reaction of various functional salicyaldehydes with the condensation product of 1,2-diaminocyclohexane mono(hydrogen chloride) and 3,5-di-tert-butylsalicylaldehyde. These ligands in conjunction with Ti(O(i)Pr)(4) exhibited ex...

Journal: :Journal of the American Chemical Society 2011
Jun Shimokawa Takaaki Harada Satoshi Yokoshima Tohru Fukuyama

The first total synthesis of gelsemoxonine (1) has been accomplished. Divinylcyclopropane-cycloheptadiene rearrangement of the highly functionalized substrate was successfully applied to assemble the spiro-quaternary carbon center connected to the bicyclic seven-membered core structure. A one-pot isomerization reaction of the α,β-unsaturated aldehyde to the saturated ester via the TMSCN-DBU rea...

2015
Xinchen Kang Wenting Shang Qinggong Zhu Jianling Zhang Tao Jiang Buxing Han Zhonghua Wu Zhihong Li Xueqing Xing

We proposed a strategy to synthesize mesoporous inorganic salt particles using the special properties of ionic liquid (IL) mixtures, and hollow mesoporous LaF3, NdF3, and YF3 particles were synthesized and characterized using different techniques. The size of the mesopores in the salt particles was about 4 nm, and the materials were full of crystal defects. The LaF3, NdF3 and YF3 particles were...

2012
Ramesh C. Kumar Oskar Glemser

A moderately stable hexacoordinated sulfur(VI) compound with four different kinds of ligands, CF3SF2(CN)2C1, results when CF3SF4CI is reacted with (CH3)3SiCN. The latter compound also gives F2S(CN)2 and (CF3)2S(CN)2 with SF4 and (CF3)2SF2, respectively. These tetracoordinated suifur(IV) compounds decompose rapidly at 25 °C but are stable at lower temperatures. With OSCl2 and SC12, the white sol...

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