铁 ( III ) salen 配合物 ( R , R )- N , N'-双(亚水杨基)-1,2-环己烷二胺铁 ( III ) 氯化物已被开发为醇类无受体脱氢的催化剂。该络合物催化不同伯醇和胺以高产率直接合成亚胺并释放氢气。该机制已经通过标记底物进行了实验研究,并通过密度泛函理论计算进行了理论上的研究。与相应的锰(III) salen 催化的脱氢,不可能确定与铁配合物的均相催化途径。相反,三甲基膦和汞的中毒实验表明,催化活性物质是异质的小铁颗粒。
Vanadium- and Chromium-Catalyzed Dehydrogenative Synthesis of Imines from Alcohols and Amines
作者:Yulong Miao、Simone V. Samuelsen、Robert Madsen
DOI:10.1021/acs.organomet.1c00123
日期:2021.5.10
Vanadium(IV) tetraphenylporphyrin dichloride and chromium(III) tetraphenylporphyrin chloride have been developed as catalysts for the acceptorless dehydrogenation of alcohols. The catalysts have been applied to the direct synthesis of imines in overall good yields from a variety of alcohols and amines. The transformations are proposed to proceed by metal–ligand bifunctional pathways with an outer-sphere
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。