Organic reactions in liquid crystalline solvents. 9. Investigation of the solubilization of guest molecules in a smectic (crystal-B) liquid crystal by deuterium NMR, calorimetry, optical microscopy, and photoreactivity methods
Nickel-Catalyzed Reductive Coupling of γ-Metalated Ketones with Unactivated Alkyl Bromides
作者:Ning Cui、Tingzhi Lin、Yan-En Wang、Jian Wu、Yuheng Han、Xinyang Xu、Fei Xue、Dan Xiong、Patrick J. Walsh、Jianyou Mao
DOI:10.1021/acs.orglett.2c01390
日期:2022.6.10
A nickel-catalyzed reductive cross-coupling reaction of aryl cyclopropyl ketones with easily accessible unactivated alkylbromides to access aryl alkyl ketones has been developed. This strategy facilitates access to various of γ-alkyl-substituted ketones via ring opening of cyclopropyl ketones (26 examples, 50–90% yield). Initial mechanistic studies revealed that the reaction proceeds via radical cleavage
Nickel-Catalyzed Cross-Coupling between Functionalized Primary or Secondary Alkylzinc Halides and Primary Alkyl Halides
作者:Anne Eeg Jensen、Paul Knochel
DOI:10.1021/jo0105787
日期:2002.1.1
In the presence of Bu4NI (3 equiv) and 4-fluorostyrene (20 mol %), unreactive primary and secondary alkylzinc iodides undergo nickel-catalyzed cross-couplings with various primary alkyl iodides or bromides. More reactive secondary dialkylzincs and the mixed zinc organometallics RZnTMSM undergo the cross-coupling reaction in the absence of Bu4NI. The bicyclic secondary diorganozinc 6 prepared via boron-zinc exchange reacts with high retention of configuration. Free NH-groups are tolerated in the cross-coupling allowing the synthesis of aminated products.
Liquid-crystalline solvents as mechanistic probes. 21. Control of Norrish II 1,4-biradical reactivity by the phase and molecular dimensions of an ordered solvent
作者:Richard G. Zimmermann、Jerry H. Liu、Richard G. Weiss
DOI:10.1021/ja00277a034
日期:1986.8
Generation of α‐Boryl Radicals and Their Conjugate Addition to Enones: Transition‐Metal‐Free Alkylation of
<i>gem</i>
‐Diborylalkanes
作者:Chaoqiang Wu、Zhicheng Bao、Bowen Dou、Jianbo Wang
DOI:10.1002/chem.202004581
日期:2021.2
A transition‐metal‐free method for the alkylation of gem‐diborylalkanes with α,β‐unsaturated ketones has been developed. It is demonstrated that the α‐boryl radicals can be generated efficiently from gem‐diborylalkanes with the aid of catechol and oxidants. The α‐boryl radicals formed through such process can be engaged in conjugate addition reaction with α,β‐unsaturated ketones. This transformation
Organic reactions in liquid crystalline solvents. 9. Investigation of the solubilization of guest molecules in a smectic (crystal-B) liquid crystal by deuterium NMR, calorimetry, optical microscopy, and photoreactivity methods
作者:Brian J. Fahie、D. Scott Mitchell、Mark S. Workentin、William J. Leigh