通过可见光进行工程光氧化还原触发的化学转化已成为有机合成领域的新兴领域。但是,大多数成熟的光催化剂都是基于与贵金属和有机配体有关的过渡金属络合物或光敏有机染料,大大阻碍了可以提供更好的稳定性和耐久性的纯无机分子光催化剂的开发。在这里,我们发现安德森多金属氧酸盐(POM)Na 4 [NiMo 6 O 18(OH)6 ](1)由纯的无机骨架组成,该骨架由中心的Ni II核构建而成,并由六个Mo VI O 6支撑。无机支架/配体,可用作强大的光催化剂。在可见光(> 400 nm)照射下,该化合物可以高效催化多种反应,包括氯化物与胺的氧化交叉偶联反应,以及使用分子氧的氯化物氧化,从而提供多种亚胺,醛和酮,分别具有高选择性和高收率。由于具有强大的无机骨架,该催化剂在催化过程中表现出出色的稳定性和可重复使用性,而催化活性几乎没有损失,因此提供了一种无需使用复杂的有机配体和昂贵的贵金属基光敏剂的替代方案。
Heavy atom isotope effect studies of elimination reaction mechanisms. 1. A kinetic and carbon-14 kinetic isotope effect study of the base-promoted dehydrochlorination of substituted 1-phenylethyl-2-14C chlorides
作者:Tayyaba Hasan、Leslie B. Sims、Arthur Fry
DOI:10.1021/ja00350a038
日期:1983.6
El-like E2 to ElcB-like E2 as the substituents change from electron donating group (EDG) to electron withdrawing (EWG). In this first carbon isotope effect study of an elimination reaction of an alkylchloride, carbon-14 kinetic isotope effects have been measured in the alkoxide/bis(2-hydroxyethyl) ether-Me/sub 2/SO system for 1-(4-methylphenyl)ethyl-2-/sup 14/C chloride, k/sup ..beta../k = 1.038, 1-phenylethyl-2-/sup
Direct Conversion of Carbonyl Compounds into Organic Halides: Indium(III) Hydroxide-Catalyzed Deoxygenative Halogenation Using Chlorodimethylsilane
作者:Yoshiyuki Onishi、Daigo Ogawa、Makoto Yasuda、Akio Baba
DOI:10.1021/ja0283246
日期:2002.11.1
the corresponding deoxygenativechlorination products, in which the carbonyl carbon accepted two nucleophiles (H and Cl) with releasing oxygen. Only In(OH)3 catalyzed the reaction, and typical Lewis acids such as TiCl4, AlCl3, and BF3.OEt2 showed no catalytic activity. The reaction mechanism of this deoxygenativechlorination includes initial hydrosilylation followed by chlorination. Other nucleophiles
A Highly Chemoselective and Rapid Chlorination of Benzyl Alcohols under Neutral Conditions
作者:Chunbao Li、Lili Sun、Guisheng Peng、Hongmei Niu、Qiang Wang
DOI:10.1055/s-0028-1083243
日期:2008.12
A rapid and highly selective chlorination method has been developedusing 2,4,6-trichloro-1,3,5-triazine (TCT) catalyzed by dimethylsulfoxide. The reactions take 10 to 40 minutes, and the yields arealmost quantitative. The neutral reaction conditions are compatiblewith substrates bearing acid-labile functional groups. Both competitiveintramolecular and intermolecular reactions for benzyl alcoholsin
DMSO-catalyzed chlorination of alcohols using N-phenylbenzimidoyl chloride
作者:Qiang Wang、Jian Xu、Zhou-Qing Xu、Ji-Dan Yan
DOI:10.1007/s11164-012-0738-z
日期:2013.5
N-phenylbenzimidoyl chloride has been demonstrated as an efficient chlorination reagent catalyzed by dimethyl sulfoxide (DMSO) in conversion of alcohols to corresponding chlorides. The reaction conditions were mild, and most of the substrates gave satisfactory yields. The configurationinversion of the chlorination was proved using optically active phenyl alcohols. The amount of DMSO can be as low as
Reported herein is a palladium-catalyzed secondary benzylic imidoylative Negishi reaction leveraging the sterically bulky aromatic isocyanides as the imine source. This method allows the facile access of alkyl-, (hetero)aryl-, and alkynylzinc reagents to afford various α-substituted phenylacetone products under mild acidic hydrolysis, which are ubiquitous motifs in many pharmaceuticals and biologically