Pyrrolidine catalyzed novel domino reaction for the synthesis of polysubstituted 4-oxocyclohexanecarbaldehyde derivatives
作者:Feng-Zu Bao、Xiao-Bing Wang、Ling-Yi Kong
DOI:10.1016/j.tetlet.2012.12.125
日期:2013.3
novel domino reaction catalyzed by an organic molecule based on α,β-unsaturated aromatic aldehydes and methylethylketones has been developed. The progress allows one-pot and efficient synthesis of polysubstituted 4-oxocyclohexanecarbaldehyde derivatives via pyrrolidine mediated under mild conditions. The reaction consists of threeconsecutivereactions: an aldol condensation reaction and a tandem
LC−MS Analysis of Carbonyl Compounds and Their Occurrence in Diesel Emissions
作者:Chris A. Jakober、M. Judith Charles、Michael J. Kleeman、Peter G. Green
DOI:10.1021/ac060301c
日期:2006.7.1
carbonyls investigated. For all but five of the carbonyls examined, a pseudomolecular (M + H)+ ion is the base peak in the APCI positive ion mass spectra of PFBHA oxime derivatives and is observed in four of the five exceptions. Application of the evaluated analysis methodology to heavy-duty diesel source emissions facilitated the quantification of 10aliphatic carbonyls (5 C5-C9 ketones, 4 C6 unsaturated
Sulfamic acid: An efficient, cost-effective and green catalyst for crossed-aldol condensation of ketones with aromatic aldehydes under solvent-free
作者:Amin Rostami、Firoz Ahmad-Jangi
DOI:10.1016/j.cclet.2011.03.015
日期:2011.9
Abstract Aromatic aldehydes undergo crossed-aldol condensation with ketones in the presence of catalytic amount of sulfamic acid (SA) to afford the corresponding α , β -unsaturated aldol products under solvent-free conditions in good to high yields at 45–80 °C.
Donor-Promoted 1,2-Hydrogen Migration from Silicon to a Saturated Ruthenium Center and Access to Silaoxiranyl and Silaiminyl Complexes
作者:Hsueh-Ju Liu、Clark Landis、Christophe Raynaud、Odile Eisenstein、T. Don Tilley
DOI:10.1021/jacs.5b05571
日期:2015.7.22
complexes are derivedfrom the primary silanes MesSiH3 and TripSiH3 via activation of all three Si-H bonds. DFT calculations suggest that the mechanism of formation for the silaoxiranyl complex Cp*(IXy)(H)2Ru-Si(OCPh2)Trip (6) involves coordination of benzophenone to a silylene silicon atom, followed by a single-electron transfer in which Si-bonded, non-innocent benzophenone accepts an electronfrom the reactive
Palladium nanoparticle-cored G1-dendrimer stabilized by carbon–Pd bonds: synthesis, characterization and use as chemoselective, room temperature hydrogenation catalyst
作者:Venugopal K. Ratheesh Kumar、Karical R. Gopidas
DOI:10.1016/j.tetlet.2011.04.011
日期:2011.6
Palladium nanoparticle-cored Fréchet type G1-dendrimer (Pd-G1) stabilized by Pd–carbon bonds is synthesized and characterized by IR, NMR, UV–Vis and TEM. Pd-G1 was found to be a highly efficient, chemoselective and reusable catalyst for the room temperature hydrogenation of carbon–carbon multiple bonds. Reducible functionalities like CHO, CO, COOR, CN, NO2 and halogens were unaffected. Pd-G1 is projected