The heats of formation of imines and enamines with up to four carbon atoms were determined with the CBS-Q and G2 (MP2) composite high-level ab initio procedures. The imines are lower in energy than the corresponding enamines; the energy difference is typically some 15 kJ mol 1 , which...
The ambident anions derived from a number of imines have been alkylated using a variety of solvents and alkylating agents. Under reactive conditions enamines (N-alkylation) are formed as the main products instead of the usually observed homologous imines (C-alkylation). The influence of the type...
enamine or imine formationammoniahexafluoroacetonedistillation, columns, Podbielniak stillenamine or imine formationammoniahexafluoroacetonedistillation, columns, Podbielniak stillA new sensitivity analysis technique is developed by utilizing Tihonov's singular perturbation theory. The described sensitivity ...
RATIONALEDrug metabolites that have imine or enamine partial structures cause extra mass-to-charge (m/z) increases in online hydrogen/deuterium exchange (HDX) in addition to hydroxyl or amine protons. Online HDX and exact mass measurement were used herein to characterize this extra increase property...
Metal Template Promoted Hydroamination of Ethynylphosphines and Aniline. Asymmetric Synthesis, Coordination Chemistry, and the Imine−Enamine Tautomerism... In the presence of the organopalladium template containing the orthometalated ()-(1-(dimethylamino)ethyl)naphthylene auxiliary, both diphenyl(...
2,4-diphenyl-quinoline were purchased from EnamineStore. Phenylacetylene, 4-ethynyl benzonitrile, boron trifluoride diethyl etherate, triethylamine were purchased from Alfa Aesar chemicals. Chloranil, triflic acid, 1,3,5-triformylbenzene, benzidine, mesitylene, o-dichlorobenzene, n-butanol ...
The isolation of methylamine hydrochloride, 8-chloro-1,2,3,4-tetrahydrocarbazole, and 5-amino-6-chloro-9-methyl-1,2,3,4-tetrahydrocarbazole from the room temperature, uncatalyzed condensation between cyclohexanone and N鈥 -methyl-2,6-dichlorophenylhydrazine under enamine synthesis conditions can be...
and a remarkably low H2pressure of 1–6 bar. Conversion rates increase with metal size: Mg < Ca < Sr < Ba (for Ba, quantitative conversion is reached within 15 min). The key to this catalysis is the unanticipated formation of metal hydride species by deprotonation of ...
Imine-Enamine Systems and the Mechanism of their Oxidation1 The influence of ring size, conjugation and functional groups on the enamine-imine tautomerism of some cyclic and open unsaturated organic bases has been investigated by spectrophotometric methods. Most secondary or primary vinylamines d... ...
The imine of salicylaldehyde is stabilized through resonance-assisted hydrogen bonding and enamine/imine tautomerism (Fig. 1a) [13]. By taking use of those effects covalent organic frameworks exhibiting enhanced stability were build, with utility in gas storage, separation, and catalysis [14]. In ...