期刊
ORGANOMETALLICS
卷 36, 期 8, 页码 1662-1672出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.7b00208
关键词
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资金
- Engineering and Physical Sciences Research Council [EP/M027678/1]
- University of Strathclyde
- EPSRC [EP/M027678/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M027678/1] Funding Source: researchfish
Detailed kinetic studies of the reaction of a model Ni-0 complex with a range of aryl electrophiles have been conducted. The reactions proceed via a fast ligand exchange pre-equilibrium, followed by oxidative addition to produce either [(NiX)-X-I(dppf)] (and biaryl) or [Ni-II(Ar)X(dppf)]; the ortho substituent of the aryl halide determines selectivity between these possibilities. A reactivity scale is presented in which a range of substrates is quantitatively ranked in order of the rate at which they undergo oxidative addition. The rate of oxidative addition is loosely correlated to conversion in prototypical cross-coupling reactions. Substrates that lead to Ni-I products in kinetic experiments conditions. produce more homocoupling products under catalytic
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