Long-range spin-spin coupling and relative orientation of vinyl group in 1-venylpyrazole

Conclusions On the basis of the experimental values of the long-range spin-spin coupling constants of the protons it was established that in 1-vinylpyrazole and its 4-bromo derivative the vinyl group has predominantly a trans orientation relative to the nitrogen in the 2 position.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2363–2365, October, 1981.We express our gratitude to V. I. Glukhikh for assistance in the experimental work.     

Proton magnetic resonance spectra of some silyl-substituted ethylenes

Conclusions The PMR spectra of a number of silyl-substituted ethylenes were obtained. An explanation was given for the positions of the resonance lines of the olefinic protons.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 875–876, April, 1971.     

2-Dichloromethylene-1,3-dioxolane in the diels-alder reaction with α,Β- unsaturated aldehydes

1,4,9-Trioxa-5,5-dichlorospiro[4,5]-7-decene and 1,4,9-trioxa-6-methyl-5,5-dichlorospiro-[4,5]-7-decene were synthesized by condensation of 2-dichloromethylene-1,3-dioxolane with acrolein and crotonic aldehyde.     

Collinear cluster tripartition channel in the reaction 235U(n th, f)

Investigation of the ²³⁵U(n _th, f) reaction using the miniFOBOS double-arm time-of-flight spectrometer of fission fragments confirmed manifestations of the earlier unknown many-body, at least ternary, decay involving almost collinear decay-product escape, which were first observed in the spontaneous fission of ²⁵²Cf(sf). The use of variables sensitive to the nuclear charge of fission fragments allowed the reliability of identification of decay events to be increased and new decay modes to be revealed.     

First-Order Complexity of Subgraph Isomorphism via Kneser Graphs

Mathematical Notes - The problem of finding the least number of variables of a first-order formula expressing the statement that an input-graph contains a subgraph isomorphic to a given...     

Manifestations of Structural Phase Transitions in a Rb2KLuF6 Crystal in Its Raman Spectra

Optics and Spectroscopy - The Raman spectra of an Rb2KLuF6 crystal are studied in the temperature range from 8 to 375 K, which includes two phase transitions: one of which proceeds from a cubic to...     

The study of structure and dynamics of molecules: NMR spectra transformed by superfine coupling

In the present paper, the peculiarities of NMR phenomenon in paramagnetic systems are reported. Specifics of detection of high‐resolution NMR spectra transformed by superfine interaction are discussed. Concrete examples illustrate the modern possibilities of NMR application for the study of structure and dynamics of the molecular (multielectron) systems. Copyright © 2015 John Wiley & Sons, Ltd.