Lee, Yunmi published the artcileEfficient boron-copper additions to aryl-substituted alkenes promoted by NHC-based catalysts. Enantioselective Cu-catalyzed hydroboration reactions, Recommanded Product: 2-(2,3-Dihydro-1H-inden-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, the publication is Journal of the American Chemical Society (2009), 131(9), 3160-3161, database is CAplus and MEDLINE.
Efficient hydroboration of alkenes by bis-pinacoldiborane(4), B2pin2, catalyzed by NHC-copper(I) 2-imidazolylidene and 2-imidazolidinylidene complexes gave pinacol alkylboronic esters and the corresponding alcs. after oxidative deboration. Asym. hydroboration was achieved using chiral chloro[(4S,5S)-1,3-bis(2-methylphenyl)-4,5-diphenyl-2-imidazolylidene]copper catalyst. Reactions are promoted with 0.5-5 mol % of a readily available N-heterocyclic carbene (NHC) complex; the presence of MeOH promotes in situ protonation of the C-Cu bond and leads to efficient catalyst turnover, constituting a net Cu-catalyzed hydroboration process. Reactions proceed in >98:<2 site selectivity and furnish secondary organoborane isomers that complement those obtained through reactions of boron-hydride reagents or by Rh- or Ir-catalyzed hydroborations (benzylic secondary C-B bonds). Initial observations regarding processes catalyzed by chiral NHC complexes, delivering products in up to 99:1 enantiomeric ratio, are disclosed.
Journal of the American Chemical Society published new progress about 608534-44-7. 608534-44-7 belongs to alcohols-buliding-blocks, auxiliary class Other Aromatic,Boronic acid and ester,Boronate Esters,Boronic Acids,Boronic acid and ester, name is 2-(2,3-Dihydro-1H-inden-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C15H21BO2, Recommanded Product: 2-(2,3-Dihydro-1H-inden-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane.
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