Isotopic effect on tautomeric behavior of 5-(2,6-disubstituted-aryloxy)-tetrazoles
作者:Nader Noroozi Pesyan
DOI:10.1002/mrc.2790
日期:2011.9
Isotopic effect on tautomeric behaviors of the synthesized 5-phenoxy- (1a), 5-(2,6-dimethylphenoxy)- (1b), 5-(2,6-diisopropylphenoxy)- (1c), 5-(2,6-dimethoxyphenoxy)- (1d) and 5-(4-methylphenoxy)-tetrazole (1e) were investigated in DMSO-d6 by adding one drop of D2O. Among 1a–e, 1a, 1d and 1e show small rotational barrier around C5O1 and O1C6 while in 1b and 1c there are distinguishable rotational barrier
novel and environmentally friendly method for the one-pot preparation of newimidoyl iminosulfuranes in high yield under microwave (MW) and solvent-free conditions from the corresponding imidoyl azides is presented. This efficient synthetic approach benefits from non-toxic and non-explosive precursors for the synthesis of imidoyl iminosulfuranes.
Abstract The synthesis of new N,N-dimethyl carbamoyl 5-aryloxytetrazoles have been reported. Their dynamic 1H-NMR via rotation about C N bonds in moiety of urea group [a; CO-NMe2 and b; (2-tetrazolyl)N-COrotations] in the solvents CDCl3 (223–333 K) and DMSO (298–363 K) is studied. Accordingly, the free energies of activation, obtained 16.5 and 16.9 kcal mol−1 respectively, attributed to the conformational
A Facile and Efficient Method for Synthesis of the Aryloxyimidoyl Azides
作者:Abdoul Hossein Dabbagh、Ali Reza Modarresi-Alam
DOI:10.3184/030823400103165653
日期:2000.1
A facile and efficient synthesis is introduced for the new aryloxyimidoyl azides in a quantitative yield.
以定量收率引入了新的芳氧基亚氨酰基叠氮化物的简便有效的合成。
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作者:H. A. Dabbagh、Ya. Mansoori
DOI:10.1023/a:1013947228772
日期:——
The kinetics and mechanism of the N-2-N-1-isomerization of 2-methoxycarbonyl-5-(p-X-phenoxy)tetrazoles (X = H, CH3, NHCOCH3, Cl, Br, NO,) were studied by H-1 NMR spectroscopy in a DMSO-d(6)-CDCl3 mixture (25: 75). The rate of isomerization of the N-2-isomer into N-1-isomer fit the first-order equation (after three half-conversion periods). The isomerization is accompanied by hydrolysis and decarboxylation. The Hammett plot of ln(k(x)/k(H)) for the isomerization showed a good correlation with sigma(-) values (p(-) = 1.33, r = 0.965). A poor correlation with sigma values was obtained. The kinetic data, the effect of solvent polarity, the substituent effects, and the results of AMI quantum-chemical calculations suggest an ionic mechanism of the isomerization in polar solvents and a concerted mechanism in nonpolar solvents.