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- W2108353135 abstract "Hydride abstraction from N,N′-bis(adamantyl)-1-hydrido-1,3,2-benzodiazaborole with catalytic [Ph3C][closo-CB11H6Br6] resulted in a low yield of arene borylation and a major product derived from migration of both adamantyl groups to the arene backbone. In contrast, the related aryl-substituted diazaborole N,N′-(2,6-diisopropylphenyl)-1-bromo-1,3,2-diazaborole did not borylate benzene or toluene, being resistant to halide abstraction even with strong halide acceptors: e.g., [Et3Si][closo-CB11H6Br6]. The reactivity disparity arises from greater steric shielding of the boron pz orbital in the 2,6-diisopropylphenyl-substituted diazaboroles. Boron electrophiles derived from 1-chloro-1,3,2-benzodithiaborole ((CatS2)BCl) are active for arene borylation, displaying reactivity between that of catecholato- and dichloro-boron electrophiles. [(CatS2)B(NEt3)][AlCl4] is significantly less prone to nucleophile-induced transfer of halide from [AlCl4]¯ to boron compared to catecholato and dichloro borocations, enabling it to borylate arenes containing nucleophilic −NMe2 moieties in high conversion (e.g., N,N,4-trimethylaniline and 1,8-bis(dimethylamino)naphthalene). Calculations indicate that the magnitude of positive charge at boron is a key factor in determining the propensity of chloride transfer from [AlCl4]¯ to boron on addition of a nucleophile." @default.
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- W2108353135 date "2012-02-07" @default.
- W2108353135 modified "2023-10-01" @default.
- W2108353135 title "Reactivity of Lewis Acid Activated Diaza- and Dithiaboroles in Electrophilic Arene Borylation" @default.
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- W2108353135 doi "https://doi.org/10.1021/om201228e" @default.
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