[EN] HIGH MOLECULAR WEIGHT ALKYL-ALLYL COBALTTRICARBONYL COMPLEXES AND USE THEREOF FOR PREPARING DIELECTRIC THIN FILMS [FR] COMPLEXES ALKYLE-ALLYLE-TRICARBONYLE DE COBALT DE POIDS MOLÉCULAIRE ÉLEVÉ ET LEUR UTILISATION POUR PRÉPARER DES FILMS DIÉLECTRIQUES MINCES
Bromohydrin formation in aqueous dimethyl sulphoxide; electronic and steric effects
作者:David R. Dalton、Ved P. Dutta
DOI:10.1039/j29710000085
日期:——
elements of hypobromous acid (HOBr) to a selected group of olefins, with moist dimethyl sulphoxide as solvent-reactant and N-bromosuccinimide as the source of bromine, has been examined. In the absence of severe steric restrictions, the electronic effects have been observed to direct the addition in a Markownikoff sense. Highly hinderedolefins and those wherein the electron density at the carbon–carbon
The Mechanism Study of Free Radical S<sub>H</sub>2′ Reactions by Leaving Group Effect and Secondary α-Deuterium Kinetic Isotope Effect
作者:Yuh-Wern Wu、Shu-Hui Huang、Teong-Fuh Tseng、Jyh-Ferng Yang
DOI:10.1002/jccs.200400150
日期:2004.10
S Η 2' mechanism. It is not clear whether the S H 2' mechanism is concerted or stepwise. The leaving group effects and the secondary α-deuterium kineticisotopeeffects in free radical S H 2' reactions have been determined. The leaving group effect, k B r /k C l , is from 1.88 to 14.3. The secondary α-deuterium kineticisotopeeffects, k H /k D , are 1.20 for 2-methylallyl chloride and 1,1-d 2 -2-methylallyl
自由基加成到烯丙基化合物的反应被认为进行了S HI 2' 机理。尚不清楚 SH 2' 机制是协同的还是逐步的。已经确定了自由基 SH 2' 反应中的离去基团效应和二级 α-氘动力学同位素效应。离去基团效应 k B r /k C l 为 1.88 至 14.3。二级 α-氘动力学同位素效应 k H /k D 对于 2-甲基烯丙基氯和 1,1-d 2 -2-甲基烯丙基氯为 1.20,对于烯丙基氯和 1,1-d 2 -烯丙基氯为 1.22。自由基 SH 2' 反应似乎有利于协同机制。
2-Isopropylthioxanthone-Catalyzed Divergent Functionalization of Bicyclo[1.1.0]butanes under Visible-Light Irradiation
作者:Peng-Fei Chen、Dong-Sheng Li、Wei-Tong Ou、Fei Xue、Hong-Ping Deng
DOI:10.1021/acs.orglett.3c02332
日期:2023.8.25
1,3-Functionalized cyclobutane structural motifs are ubiquitous in natural products and pharmaceuticals. Photoinduced alkylation of bicyclo[1.1.0]butanes (BCBs) offers a step-economical strategy for accessing 1,3-functionalized cyclobutane motifs. Herein, we disclose a general and mild photocatalytic protocol of bromoallylation and alkylation of BCBs in a metal, additive-free manner by using the same