Ajai K Singh

Summary

Affiliation: Indian Institute of Technology
Country: India

Publications

  1. Singh M, Saleem F, Rao G, Kumar S, Joshi H, Singh A. Palladacycles of unsymmetrical (N,C⁻,E) (E = S/Se) pincers based on indole: their synthesis, structure and application in the catalysis of Heck coupling and allylation of aldehydes. Dalton Trans. 2016;45:6718-25 pubmed publisher
    ..The catalytic activities of complexes and were investigated for Heck coupling and allylation of aldehydes. The two reactions require 0.1-0.3 and 1 mol% loading of complexes as catalysts, respectively. ..
  2. Sharma A, Joshi H, Bhaskar R, Kumar S, Singh A. Palladacycles of sulfated and selenated Schiff bases of ferrocene-carboxaldehyde as catalysts for O-arylation and Suzuki-Miyaura coupling. Dalton Trans. 2017;46:2485-2496 pubmed publisher
    ..The catalytic process is somewhat more efficient with 2 (Pd bonded with a selenoether group), than 3, followed by 1. ..
  3. Sharma A, Joshi H, Bhaskar R, Singh A. Complexes of (η5-Cp*)Ir(iii) with 1-benzyl-3-phenylthio/selenomethyl-1,3-dihydrobenzoimidazole-2-thione/selenone: catalyst for oxidation and 1,2-substituted benzimidazole synthesis. Dalton Trans. 2017;46:2228-2237 pubmed publisher
    ..Each catalytic process is marginally more efficient with 1 than its counterparts. ..
  4. Sharma A, Joshi H, Ojha K, Singh A. Graphene oxide supported cobalt phosphide nanorods designed from a molecular complex for efficient hydrogen evolution at low overpotential. Chem Commun (Camb). 2019;55:2186-2189 pubmed publisher
  5. Singh V, Singh A. Tetragonal Cu2Se nanoflakes: synthesis using selenated propylamine as Se source and activation of Suzuki and Sonogashira cross coupling reactions. Dalton Trans. 2015;44:725-32 pubmed publisher
    ..In comparison to many other copper based nano-crystals, the present nanoflakes are a better activator. ..
  6. Prakash O, Joshi H, Kumar U, Sharma A, Singh A. Acridine based (S,N,S) pincer ligand: designing silver(I) complexes for the efficient activation of A³ (aldehyde, alkyne and amine) coupling. Dalton Trans. 2015;44:1962-8 pubmed publisher
    ..0 mol% loading of 1 and 0.5 mol% of 2 for good conversion. Complex 2 is a rare example of a catalyst that can efficiently activate A(3) coupling at a 0.5 mol% loading of Ag. ..
  7. Kumar Rao G, Kumar A, Saleem F, Singh M, Kumar S, Kumar B, et al. Palladium(II)-1-phenylthio-2-arylchalcogenoethane complexes: palladium phosphide nano-peanut and ribbon formation controlled by chalcogen and Suzuki coupling activation. Dalton Trans. 2015;44:6600-12 pubmed publisher
    ..This palladium may also be released from in situ generated NPs. In the case of , negligible reactivity may be due to non-release of Pd. ..
  8. Dubey P, Gupta S, Singh A. Base free N-alkylation of anilines with ArCH2OH and transfer hydrogenation of aldehydes/ketones catalyzed by the complexes of η5-Cp*Ir(iii) with chalcogenated Schiff bases of anthracene-9-carbaldehyde. Dalton Trans. 2018;47:3764-3774 pubmed publisher
    ..The real catalytic species proposed in the case of iridacycles results due to the loss of the Cp* ring. ..
  9. Saleem F, Rao G, Kumar S, Singh M, Singh A. Complexes of (η(6)-benzene)ruthenium(II) with 1,4-bis(phenylthio/seleno-methyl)-1,2,3-triazoles: synthesis, structure and applications in catalytic activation of oxidation and transfer hydrogenation. Dalton Trans. 2015;44:19141-52 pubmed publisher
    ..DFT calculations are consistent with somewhat low reactivity of 1 in comparison to those of 2-4. ..

More Information

Publications13

  1. Kumar S, Saleem F, Singh A. 'Click' generated 1,2,3-triazole based organosulfur/selenium ligands and their Pd(ii) and Ru(ii) complexes: their synthesis, structure and catalytic applications. Dalton Trans. 2016;45:11445-58 pubmed publisher
    ..1, with a sulfur ligand, is more efficient than 2 (Se analog) for both SMC and the Sonogashira coupling. The activities of 3 and 4 for TH are in the order Se > S. ..
  2. Singh P, Singh A. Palladium(ii) complexes of N,N-diphenylacetamide based thio/selenoethers and flower shaped Pd16S7 and prismatic Pd17Se15 nano-particles tailored as catalysts for C-C and C-O coupling. Dalton Trans. 2017;46:10037-10049 pubmed publisher
    ..0001-0.01 and 0.1 mol% of Pd, respectively, for the two reactions. The reuse of the complexes or NPs as a catalyst is demonstrated. ..
  3. Dubey P, Gupta S, Singh A. Trinuclear complexes of palladium(ii) with chalcogenated N-heterocyclic carbenes: catalysis of selective nitrile-primary amide interconversion and Sonogashira coupling. Dalton Trans. 2017;46:13065-13076 pubmed publisher
    ..The real catalytic species for the interconversion and coupling appear to be based on Pd(ii) and Pd(0), respectively. ..
  4. Bhaskar R, Sharma A, Yadav M, Singh A. Sonogashira (Cu and amine free) and Suzuki coupling in air catalyzed via nanoparticles formed in situ from Pd(ii) complexes of chalcogenated Schiff bases of 1-naphthaldehyde and their reduced forms. Dalton Trans. 2017;46:15235-15248 pubmed publisher
    ..For Sonogashira coupling, the formation and role of such Pd-based NPs under aerobic conditions were observed for the first time. The complexes 1-4 showed the potential for reuse, as in the eighth cycle, conversion dropped by only 20%. ..