66917-88-2Relevant academic research and scientific papers
Addition of Diethylzinc to Aryl Aldehydes Catalyzed by (1S,3S)-N,NI-bis-1,3-Diphenyl-1,3-Propanediamine and its Dilithium Salts: a Mechanistic Rationale Investigation.
Pini, Dario,Mastantuono, Alberto,Uccello-Barretta, Gloria,Iuliano, Anna,Salvadori, Piero
, p. 9613 - 9624 (1993)
N,NI-bis benzyl substituted 1,3-diamine 1a, synthesized in high optical purity, and the corresponding dilithium salt 1b are used, for the first time, as chiral catalysts in the addition of ZnEt2 to aromatic aldehydes.Both 1a and 1b are able to promete the reaction but the products obtained exhibited low enantiomeric excesses.By 1H NMR and UV-CD investigation, experimental evidences about the structure of some reaction intermediates have been gained: reaction pathway consistent with spectroscopic data, chemical and stereochemical results could be postulated.
TAUTOMERISM AND CONFIGURATIONAL ISOMERISM IN DIOXIMES OF β-DICARBONYL COMPOUNDS
Ershov, A. Yu.,Yakimovich, S. I.,Zelenin, K. N.,Zerova, I. V.
, p. 2062 - 2070 (2007/10/02)
According to the data from 1H and 13C NMR spectroscopy, the dioximes of β-carbonyl compounds exist in solutions in the dioxime form, represented by a series of configurational isomers, or as a mixture of the dioxime and the cyclic isoxazoline forms.The conditions for the appearance of the ring-chain equilibrium in the dioximes of β-dicarbonyl compounds were determined, and the dependence of the tautomeric and configurational composition on the structure of the β-dicarbonyl component and the nature of the solvent was studied.
