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Electronic and Ligand Properties of Skeletally Substituted Cyclic (Alkyl)(Amino)Carbenes (CAACs) and Their Reactivity towards Small Molecule Activation: A Theoretical Study
Author(s) -
Bharadwaz Priyam,
Chetia Pubali,
Phukan Ashwini K.
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201701645
Subject(s) - carbene , reactivity (psychology) , chemistry , electrophile , nucleophile , singlet state , ylide , ligand (biochemistry) , alkyl , proton affinity , adduct , computational chemistry , medicinal chemistry , photochemistry , organic chemistry , catalysis , ion , protonation , medicine , biochemistry , physics , alternative medicine , receptor , pathology , nuclear physics , excited state
Abstract Quantum chemical calculations have been carried out to understand the ligand properties of skeletally modified cyclic alkyl amino carbenes. The stability of these carbenes has been assessed from an evaluation of their singlet–triplet and stabilization energy values. Ylide substituted carbenes are found to be more stable than non‐ylidic ones in their optimized singlet state. Nucleophilicity and electrophilicity indices values were evaluated in order to further investigate the reactivity of these carbenes. The calculated values of proton affinities and the degree of gallium pyramidalization in the carbene‐GaCl 3 adducts correlate well with the σ‐basicity of these carbenes. The reactivity of non‐ylidic carbenes toward the activation of both H 2 and NH 3 are calculated to be more favourable compared to that of parent CAAC. On the other hand, ylide anchored carbenes are found to be unsuccessful toward the activation of both H 2 and NH 3 .