Molybdenum-Catalyzed Dehydrogenative Synthesis of Imines from Alcohols and Amines
作者:Kobra Azizi、Robert Madsen
DOI:10.1002/cctc.201800677
日期:2018.9.7
synthesis of imines from primary alcohols and amines with the liberation of dihydrogen. The catalyst is generated in situ from molybdenum hexacarbonyl, 1,3‐dicyclohexylimidazolium chloride and potassium tert‐butoxide and is further stabilized by the phosphine ligand dppe. Imines are formed in moderate to good isolated yields and a variety of alcohols and amines can be employed in the reaction including anilines
Development and mechanistic investigation of the manganese(<scp>iii</scp>) salen-catalyzed dehydrogenation of alcohols
作者:Simone V. Samuelsen、Carola Santilli、Mårten S. G. Ahlquist、Robert Madsen
DOI:10.1039/c8sc03969k
日期:——
The firstexample of a manganese(III) catalyst for the acceptorless dehydrogenation of alcohols is presented. N,N′-Bis(salicylidene)-1,2-cyclohexanediaminomanganese(III) chloride (2) has been shown to catalyze the directsynthesis of imines from a variety of alcohols and amines with the liberation of hydrogen gas. The mechanism has been investigated experimentally with labelled substrates and theoretically
介绍了用于醇的无受体脱氢的锰 ( III ) 催化剂的第一个例子。N , N' -双(水杨基)-1,2-环己烷二氨基锰 ( III ) 氯化物 ( 2 ) 已被证明可催化从各种醇和胺直接合成亚胺,并释放氢气。该机制已经用标记的底物进行了实验研究,并在理论上用 DFT 计算进行了研究。结果表明金属-配体双功能途径,其中salen配体中的两个亚胺基团首先被还原形成锰(III) 酰胺络合物作为催化活性物质。然后通过逐步的外球氢转移发生醇的脱氢,产生氢化锰( III ),从中释放氢气。
In Situ Generated Cobalt Catalyst for the Dehydrogenative Coupling of Alcohols and Amines into Imines
作者:Fabrizio Bottaro、Robert Madsen
DOI:10.1002/cctc.201900392
日期:2019.6.6
An in situ formed cobalt catalyst is developed from cobalt(II)bromide, bis[2‐(diisopropylphosphino)‐4‐methylphenyl]amine and zinc metal. The catalyst mediates the acceptorless dehydrogenative coupling of alcohols and amines into imines with the release of hydrogen gas and the transformation is applied to the synthesis of a variety of imines from different alcohols and amines. The mechanism is investigated
Reactivity of Naphthylimines toward Fe<sub>2</sub>(CO)<sub>9</sub>: Observation of Three Different Hydrogen Migration Pathways
作者:Wolfgang Imhof
DOI:10.1021/om990067z
日期:1999.11.1
different types of these hydrogen-transfer reactions were observed: a 1,3 hydrogen shift toward the former imine carbon atom, a 1,4 hydrogen shift toward the former imine nitrogen atom, or a 1,3 shift reaction toward one of the aromatic carbon atoms of the naphthalene system, which thus leaves the exocyclic imine function unreacted. In the reaction of β-naphthyl derivatives the formation of trinuclear
Fe 2(CO)9的反应与衍生自α-或β-萘甲醛的亚胺配体形成一系列羰基铁络合物。它们中的大多数是由相对于环外亚胺功能的邻位CH活化反应产生的。然后该反应通过随后的分子内氢转移反应进行,并产生几种双核化合物。观察到三种不同类型的氢转移反应:1,3氢向前亚胺碳原子转移,1,4氢向前亚胺氮原子转移,或1,3氢向芳族化合物之一转移萘系统的碳原子,从而使环外亚胺官能团未反应。在β萘基衍生物的反应三核复合物的形成是由η观察到4-第三Fe(CO)3基与萘的第二个环的配位。除此之外,的第一示例结构表征(η 4 -1-氮杂二烯)的Fe(CO)3配合物与所述C-C双键被正式作为副产物获得的环状芳族系统的一部分。