@article { ISI:000242960400016, title = {Rate enhancement in palladium catalyzed Heck reactions by Lewis acid promoters}, journal = {Catalysis Communications}, volume = {8}, number = {2}, year = {2007}, month = {FEB}, pages = {183-186}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Significant enhancement in the rate of Heck reactions has been achieved when catalytic amounts of Lewis acid (like FeCl(3)) promoters in the presence of trace amounts of water (\> 2000 ppm) are used along with Pd complex catalysts. Experiments with different aryl halides, bases as well as olefins have been carried out to demonstrate the role of Lewis acid promoters. The increase in the reaction rates is due to the weakening of Ar-X bond by the Lewis acid in the manner similar to Friedel-Crafts reaction. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {Heck reaction, Lewis acid, Palladium, Promoters}, issn = {1566-7367}, doi = {10.1016/j.catcom.2006.05.043}, author = {Sud, Abhishek and Deshpande, Raj Madhukar and Chaudhari, Raghunath V.} } @article { ISI:000271067400004, title = {Cu(OTf)(2)-catalyzed alpha-halogenation of ketones with 1,3-dichloro-5,5 {\textquoteleft}-dimethylhydantoin and N-bromosuccinimide}, journal = {Indian Journal of Chemistry Section B-Organic Chemistry including Medicinal Chemistry}, volume = {48}, number = {10}, year = {2009}, month = {OCT}, pages = {1424-1430}, publisher = {COUNCIL SCIENTIFIC \& INDUSTRIAL RES}, address = {ANUSANDHAN BHAWAN, 2 RAFI MARG, NEW DELHI, 110001, INDIA}, abstract = {

Copper(II) triflate catalyses efficiently the alpha-halogentation of aryl or alkyl ketones with 1,3-dichloro-5,5{\textquoteright}-dimethyl-hydantoin and N-bromosaccinimde to give the corresponding alpha,alpha-dichloroketones and alpha-bromoketones in high yield with excellent product selectivity.

}, keywords = {Bromination, Catalyst, chlorination, copper (II), Ketone, Lewis acid}, issn = {0376-4699}, author = {Jagdale, Arun R. and Chouthaiwale, Pandurang V. and Sudalai, Arumugam} } @article { ISI:000271443200024, title = {Synthesis of N-methylaniline by aniline alkylation with methanol over Sn-MFI molecular sieve}, journal = {Catalysis Letters}, volume = {133}, number = {1-2}, year = {2009}, month = {NOV}, pages = {175-184}, publisher = {SPRINGER}, address = {233 SPRING ST, NEW YORK, NY 10013 USA}, abstract = {

Sn-MFI molecular sieves (Tin silicalite-1) with SiO(2)/SnO(2) molar ratio of 50-150 were synthesized and characterized. Elemental analysis, XRD and DRUV-vis confirmed that prepared samples were of MFI zeolite structure and Sn was incorporated in MFI framework. Vapor phase methylation of aniline over Sn-MFI was systematically studied and optimizations of process parameters were carried out. Sn-MFI (SiO(2)/SnO(2) = 50) was found to be optimum catalyst with 55\% aniline conversion and 60\% N-methylaniline selectivity. At lower space velocity (higher contact time) of 1 h(-1), aniline conversion was found to be increased to 71\% with reduction in N-methylaniline selectivity to 39\% and increased in N,N-dimethylaniline selectivity to 58\%. The reaction follows first order kinetics with respect to aniline having activation energy of 7.3 kcal/mol.

}, keywords = {Aniline, Lewis acid, Methanol, N-methylaniline, Sn-MFI}, issn = {1011-372X}, doi = {10.1007/s10562-009-0143-4}, author = {Niphadkar, P. S. and Joshi, P. N. and Gurav, H. R. and Deshpande, Suvarna S. and Bokade, Vijay V.} } @article { ISI:000280389500002, title = {Addition of a silyl ketene acetal to alpha,beta-unsaturated cyclic anhydrides}, journal = {Synthetic Communications}, volume = {40}, number = {16}, year = {2010}, month = {JUL}, pages = {PII 924771265}, publisher = {TAYLOR \& FRANCIS INC}, address = {325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA}, abstract = {

Addition of [1-methoxy-2 methyl-1-propenyl)-oxy] trimethylsilane (MTS) to unsymmetrical ,-unsaturated cyclic anhydrides (namely, itaconic anhydride and citraconic anhydride) as well as symmetrical anhydrides (namely, maleic anhydride and 2,3-dimethylmaleic anhydride) was investigated. Itaconic anhydride isomerizes to citraconic anhydride in the presence of MTS. In the presence of Lewis acid catalysts (Yb(OTf)3/CH2Cl2), MTS adds to itaconic anhydride at room temperature in a 1,4-fashion. 1,2-Addition is the preferred pathway with both 2,3-dimethyl maleic anhydride and citraconic anhydride.

}, keywords = {1, 2-Addition, 4-addition, cyclic anhydrides, Lewis acid, Silyl ketene acetal}, issn = {0039-7911}, doi = {10.1080/00397910903243815}, author = {Gnaneshwar, Rudhramyna and Sivaram, Swaminathan} } @article { ISI:000362919100021, title = {Mild regiospecific alcoholysis and aminolysis of epoxides catalyzed by zirconium(IV) oxynitrate}, journal = {Tetrahedron Letters}, volume = {56}, number = {43}, year = {2015}, month = {OCT}, pages = {5916-5919}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A regiospecific method for the ring-opening reaction of epoxides by the primary, secondary, tertiary alcohols, and aryl, aliphatic amines has been developed using non-toxic metal nitrate salt as a catalyst. The best results were obtained using zirconium(IV) oxynitrate among the various screened metal nitrate salts. The reported protocol works efficiently for styrene epoxide and aliphatic as well. (C) 2015 Elsevier Ltd. All rights reserved.

}, keywords = {Alcoholysis, Aminolysis, Epoxide, Lewis acid, Zirconia}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2015.09.031}, author = {Shinde, Sandip S. and Said, Madhukar S. and Surwase, Trupti B. and Kumar, Pradeep} }