ORCID Profile
0000-0002-4150-2408
Current Organisation
Nanyang Technological University
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Publisher: Elsevier BV
Date: 10-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B924613D
Abstract: The asymmetric cycloaddition reactions of 3,4-dimethyl-1-phenylarsole and (Z/E)-diphenyl-1-propenylphosphine/diphenyl-1-styrylphosphine promoted by a chiral organopalladium(ii) complex derived from (S)-[1-(dimethylamino)ethyl]naphthalene proceeded stereoselectively to generate different exo/endo-products. The reactions involving the (Z/E)-methyl substituted phosphines gave the in idual optically pure exo- and endo-cycloadducts in very high stereoselectivity (33 : 1). However, when the methyl group was replaced by a Ph moiety both (Z/E)-phenyl substituted phosphines produced the same endo-cycloadduct in a stereoselectivity of 15 : 1. Every reaction produced five new chiral centers (four of them are sterically independent) in a single step and all three optically pure As-P heterobidentate ligands were obtained in high yields. The mechanism involved in the conversion of exo- to endo-product was investigated via density functional theory calculations. Computational results were consistent with the experimentally observed endo/exo-selectivity.
Publisher: Elsevier BV
Date: 05-2009
Publisher: Elsevier BV
Date: 08-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA08836A
Abstract: The synthesis, crystal structure and catalysis of a series of sterically bulky amidomagnesium methyl complexes are described.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8QO00720A
Abstract: A series of unsymmetrical magnesium( i ) complexes have been synthesized and used as highly active pre-catalysts for various hydroboration reactions.
Publisher: Elsevier BV
Date: 2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC00826D
Abstract: The magnesium( i ) complex [( Xyl Nacnac)Mg] 2 was employed as a highly efficient catalyst for ketone cyanosilylation with TMSCN under mild conditions.
Publisher: Elsevier BV
Date: 12-2016
Publisher: American Chemical Society (ACS)
Date: 15-01-2009
DOI: 10.1021/OM8009188
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2DT12379G
Abstract: A series of enantiomerically pure 1,2-diester substituted P,N-ligands incorporating two chiral carbons in the backbone were generated in high yields and high stereoselectivity from acetylenedicarboxylate via initial hydrophosphination using diphenylphosphine followed by hydroamination with various primary and secondary amines. The reactions were activated and stereochemically controlled by the organopalladium complex containing ortho-palladated (S)-(1-(dimethylamino)ethyl)naphthalene under mild conditions. The absolute stereochemistry and the coordination chemistry of P,N-products were determined by the single crystal X-ray diffraction analysis. All the chiral P,N-ligands could be liberated from the palladium template without loss of optical purity. Subsequent recomplexation to selected chiral palladium centers confirmed the optical purity of the new functionalized chiral P,N-ligands.
Publisher: American Chemical Society (ACS)
Date: 22-09-2015
Publisher: Elsevier BV
Date: 04-2014
Publisher: Wiley
Date: 04-2010
Publisher: American Chemical Society (ACS)
Date: 03-12-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NJ02722J
Abstract: The hydroboration of a wide range of ketones with HBpin under catalyst-free and solvent-free conditions was reported in high yields.
Publisher: American Chemical Society (ACS)
Date: 14-09-2007
DOI: 10.1021/IC701419J
Abstract: The organopalladium complex containing ortho-metalated (S)-[1-(dimethylamino)ethyl]phenylene as the chiral auxiliary has been used as the chiral template to promote the asymmetric cycloaddition reaction between diphenylvinylphosphine and 3,4-dimethyl-1-phenylarsole. A diphenylphosphino-substituted asymmetrical heterobidentate arsanorbornene (As-P) ligand was obtained stereoselectively on the chiral palladium template in moderate yield. The chiral benzylamine auxiliary could be removed chemoselectively from the template by treatment with HCl to produce the neutral complex [(As-P)PdCl2]. In contrast to their reported P-P analogue, the arsenic donor in the dichloro complex could be eliminated stereospecifically under mild reaction conditions to generate the corresponding 1-(diphenylphosphino)-3,4-dimethyl-2,4-cyclohexadiene, which remained as a bidentate ligand at the PdCl2 unit via phosphorus and the eta2-C4-C5 double bond. The arsenic-elimination process was found to be influenced by the halo ligand in [(As-P)PdX2]. A similar process was observed with the analogous dibromo complex, but the corresponding diiodo species did not show similar reactivity. All of the novel As-Pd complexes have been characterized by X-ray crystallography.
Publisher: Elsevier BV
Date: 10-2008
Publisher: American Chemical Society (ACS)
Date: 31-07-2009
DOI: 10.1021/OM900530Q
Publisher: Elsevier BV
Date: 06-2006
Location: Singapore
No related grants have been discovered for Sumod Pullarkat.