134815-92-2Relevant academic research and scientific papers
(E)/(Z) Equilibria, 13. Molecular Structures of a Lithiated Schiff Base and a Related Dialkyl Ketone Imine
Knorr, Rudolf,Dietrich, Hans,Mahdi, Waruno
, p. 2057 - 2063 (2007/10/02)
The ether-solvated lithium derivative of pinacolone anil (2a) is shown to be a centrosymmetric dimer (1) by X-ray diffraction analysis.Each lithium atom is bound to two nitrogen atoms, to the oxygen atom of diethyl ether, and weakly to two carbon atoms of a phenyl ring , but not to the vinyl moiety of the enamide anion.Despite conformational deconjugation, 1 is methylated at the carbon atom by methyl iodide. 1H-NMRshifts of 1 in solution are solvent-dependent.The results are discussed with respect to the "syn effect" in 1-azaallyl anions.The molecular structure of the dianil 3 of 2,2,7,7-tetramethyl-3,6-octanedione shows that a CH proton may approach the ? face of an aromatic carbon atom down to a nonbonding distance of 2.74 Angstroem without causing much strain. Key Words: Conformation analysis / Lithium compounds / Schiff bases / Imines
