A novel route to imidoylbenzotriazoles and their application for the synthesis of enaminones

Reactions of secondary amides 2a-i with 1-chloro-1H-benzotriazole and triphenylphosphine give imidoylbenzotriazoles 3a-i. The treatment of 3a,b,e,g with silyl enol ethers 5a,b in the presence of potassium tert-butoxide provides a new general approach to enaminoketones 6a-h.     

Dynamic molecular interferometer: probe of inversion symmetry in I2(-) photodissociation

Time-resolved photoelectron imaging of negative ions is employed to examine 780-nm dissociation dynamics of I2(-), emphasizing the effects of interference in time-resolved photoelectron angular distributions obtained with 390-nm probe. No energetic changes are observed after about 700 fs, but the evolution of the photoelectron anisotropy persists for up to 2.5 ps, indicating that the electronic wave function of the dissociating anion continues to evolve long after the asymptotic energetic limit of the reaction has been effectively reached. The time scale of the anisotropy variation corresponds to a fragment separation of the same order of magnitude as the de Broglie wavelength of the emitted electrons (lambda=35 A). These findings are interpreted by considering the effect of I2(-) inversion symmetry and viewing the dissociating anion as a dynamic molecular-scale "interferometer," with the electron waves emitted from two separating centers. The predictions of the model are in agreement with the present experiment and shed new light on previously published results [A. V. Davis, R. Wester, A. E. Bragg, and D. M. Neumark, J. Chem. Phys. 118, 999 (2003)].     

Reaction of triethyl phosphite withβ-substituted nitriles

Conclusions Propionitriles having hydroxy, acetate, and phenoxy groups in the-position are capable of undergoing the Arbuzov rearrangement with triethyl phosphite to form diethyl-cyanoethylphosphonate.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2089–2090, September, 1967.     

Stability of the laminar boundary layer in an incompressible gas bearing a solid impurity

The article considers the problem of the effect of solid particles suspended in a gas on the stability of the laminar boundary layer with respect to Tollmin-Schlichting waves. An actual scheme for calculating stability is proposed, based on Lin's method. It is shown that, with small values of the concentration of the impurity, s, the critical Reynolds number depends on the parameter =s ( is the dimensionless relaxation time of a particle), increasing with an increase in this parameter. An impurity consisting of asymmetric particles leads to a smaller increase of the stability than an impurity consisting of spherical particles of the same mass.Translated from Izvestiya Akademii Nauk SSSR. Mekhanika Zhidkosti i Gaza, No. 2, pp. 103–110, March–April, 1971.     

Solvent resonance effect on the anisotropy of NO(-)(N(2)O)(n) cluster anion photodetachment

Photodetachment from NO(-)(N(2)O)(n) cluster anions (n< or =7) is investigated using photoelectron imaging at 786, 532, and 355 nm. Compared to unsolvated NO(-), the photoelectron anisotropy with respect to the laser polarization direction diminishes drastically in the presence of the N(2)O solvent, especially in the 355 nm data. In contrast, a less significant anisotropy loss is observed for NO(-)(H(2)O)(n). The effect is attributed to photoelectron scattering on the solvent, which in the N(2)O case is mediated by the (2)Pi anionic resonance. No anionic resonances exist for H(2)O in the applicable photoelectron energy range, in line with the observed difference between the photoelectron images obtained with the two solvents. The momentum-transfer cross section, rather than the total scattering cross section, is argued to be an appropriate physical parameter predicting the solvent effects on the photoelectron angular distributions in these cluster anions.