Nucleophilic addition of organochromium reagents to carbonyl compounds
نویسندگان
چکیده
منابع مشابه
Enantioselective addition of organozinc reagents to carbonyl compounds*
Different chiral camphorsulfonamide derivatives containing a hydroxy or a sulfonamido functionality, as well as chiral 1,2-hydroxysulfonamides, have been evaluated as chiral promoters in the classical enantioselective addition of dialkylzinc reagents to aldehydes in the presence of titanium tetraisopropoxide (ee up to 96 %). Surprisingly, ligands with a structure of isoborneol are able to promo...
متن کاملPreparation of silyl substituted crotylzinc reagents and their highly diastereoselective addition to carbonyl compounds.
Readily prepared beta-silyl substituted crotylzinc reagents undergo highly selective allylation of carbonyl compounds leading to syn-homoallylic alcohols.
متن کاملComputational calculation of equilibrium constants: addition to carbonyl compounds.
Hydration reactions are relevant for understanding many organic mechanisms. Since the experimental determination of hydration and hemiacetalization equilibrium constants is fairly complex, computational calculations now offer a useful alternative to experimental measurements. In this work, carbonyl hydration and hemiacetalization constants were calculated from the free energy differences betwee...
متن کاملRole of Titnium Reagents in Carbonyl Compounds Reactions
This article describes some important organic reactions catalyzed by different titanium-reagents. Combinatorial approach and green procedures involving the use of titanium reagents with other transition-metals (such as Sm, Pd, Sn and Zn) in photochemical procedures, and with the auxiliary techniques like microwaves for environmental friendly reaction conditions, are also discussed.
متن کاملTandem nucleophilic addition-Oppenauer oxidation of aromatic aldehydes to aryl ketones with triorganoaluminium reagents.
In the presence of pinacolone, the in situ prepared triorganoaluminium reagents reacted with aromatic aldehydes to give ketones in moderate to high yield. We propose that the products are formed via a tandem organoaluminium reagents addition-Oppenauer oxidation sequence.
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ژورنال
عنوان ژورنال: Proceedings of the Japan Academy, Series B
سال: 2000
ISSN: 0386-2208,1349-2896
DOI: 10.2183/pjab.76.123