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