Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 1,3-Bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene, is researched, Molecular C21H24N2, CAS is 141556-42-5, about Bonding Situation in Stannocene and Plumbocene N-Heterocyclic Carbene Complexes.Reference of 1,3-Bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene.
A detailed exptl. and computational study of stannocene and plumbocene N-heterocyclic carbene complexes is presented. This unique class of Group 14 Lewis acid base adducts was obtained from reactions of the corresponding metallocenes and N-heterocyclic carbenes (NHC), and were structurally characterized by single crystal x-ray diffraction. The obtained structures show a perpendicular pose of the NHC with respect to the metallocene, hence precluding the maximal interaction between the moieties. The nature of the Sn-CNHC and Pb-CNHC bonds were studied by applying Natural Bond Orbitals Anal. (NBO) and Energy Decomposition Anal. (EDA-NOCV). For the sake of comparison, known stannocene and plumbocene Lewis base complexes were included in the series. The attractive chem. bonding interactions are ∼50% electrostatic, 30% covalent and 20% dispersion. Indeed, dispersion interactions play a determining role the bigger the substituents become. The covalent interactions derive from the donation of the carbene ligand into the empty p orbital of the metallocene.
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