Reaction of aromatic aldehydes and ketones with ytterbium metal gives the corresponding pinacols in high yields. Cross-coupling reaction of benzophenone with other carbonyl compounds to produce unsymmetrical pinacols is also described.
Regioselective deuteration of alcohols in D<sub>2</sub>O catalysed by homogeneous manganese and iron pincer complexes
作者:Sayan Kar、Alain Goeppert、Raktim Sen、Jotheeswari Kothandaraman、G. K. Surya Prakash
DOI:10.1039/c8gc01052h
日期:——
We report a convenient and cost-effective protocol for the regioselective deuteration of primary and secondary alcohols using Earth abundant homogeneous first row transition metal pincer catalysts. D2O is utilized as both a deuterium source and a solvent, allowing for a benign inexpensive process. Depending on the metal selected (Mn or Fe), a high degree of deuterium incorporation was observed selectively
The ruthenium‐catalyzed dehydrogenation of alcohols in the presence of N,N'‐diisopropylcarbodiimide in toluene under neutral conditions proceeded smoothly to give corresponding carbonylcompounds in good to excellent yields with good functional group tolerance. This is the first report for the use of carbodiimide as a hydrogen acceptor for dehydrogenative oxidation of alcohols. Kinetic analysis for
Metal amidoboranes (MABs), such as lithium amidoborane (LiAB), show superior ability in reducing ketones and imines directly into their corresponding secondary alcohols and amines, respectively, at room temperature with high conversion and yields. A mechanistic study indicates that the reduction proceeds through a double‐hydrogen‐transfer process. Both protic H(N) and hydridic H(B) protons in the amidoborane
Ruthenium(II) Picolyl-NHC Complexes: Synthesis, Characterization, and Catalytic Activity in Amine N-alkylation and Transfer Hydrogenation Reactions
作者:Francys E. Fernández、M. Carmen Puerta、Pedro Valerga
DOI:10.1021/om300692a
日期:2012.10.8
were recrystallized, and X-ray crystal structures are reported for 1a,f. Furthermore, compounds 1a–f show catalyticactivity in transfer hydrogenation of ketones and N-alkylation of amines. Notably, complexes 1a,c,f were found to be very efficient and versatile catalysts toward transfer hydrogenation of a wide range of ketones and imines in addition to N-alkylation of several amines.