Über Parallelkurven von Epi- und Hypozykloiden

Ohne Zusammenfassung     

Letter to the Editorial Board on the Paper by V. A. Alimov and A. V. Rakhlin, “On Some Features of Decameter Radio Astronomy”

Radiophysics and Quantum Electronics -     

Styryl-substituted spirochromenes of the indoline series

Styryl-substituted salicylaldehydes were obtained from 5-chloromethylsalicylaldehyde by means of the Wittig reaction, nitration, and several other reactions, and spirochromenes of the indoline series were subsequently synthesized. The possibility of carrying out nitration in the aromatic ring of the benzyl-substituted phosphonium salt and the Wittig reaction at one of the two formyl groups in 5-formylsalicylaldehyde and at the formyl group in the indolinospirochromene molecule is demonstrated. The introduction of a styryl substituent in the chromene part of a photochromic indolinospirochromene gives rise to a significant bathochromic shift of the long-wave absorption band of the photomerocyanine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 207–213, February, 1979.     

Über die Kurven,unter deren Zwischenevoluten sich kreise befinden

Ohne Zusammenfassung     

Über einige Transformationen ebener Kurven

Ohne Zusammenfassung     

Effect of different barium concentrations in KCl crystals on X-ray diffuse scattering

Using the X-ray diffuse scattering technique, KCl crystals with various Ba impurity concentrations (0.0027–0.353 at. %) have been studied. Isointensity curves for all the crystals studied were constructed, which permitted discovering a strong concentration dependence of the diffuse scattering intensity. Starting with 0.0027 at. % Ba the Guinier-Preston zones appear in the {100} planes. At higher Ba concentrations their number (up to 7 planes in the zone) and sizes increase. The limiting Ba solubility in the KCl lattice is shown to be less than 0.0025 at. %. The diffuse spot elongation in the 〈130〉 directions at Ba concentration of 0.012 at. % results from diffraction effects of summation of spaces stress vectors acting in the 〈100〉 direction. The analysis of non-uniform Ba distribution in KCl gave the form and character of segregates which are described by a two-phase model. Shown is the effect of various impurity concentrations on the coherent coupling of the substance and matrix.     

3-Nitro-5-chloromethylsalicylaldehyde in the synthesis of photochromic spirochromenes of the indoline series

The nitration of 5-chloromethylsalicylaldehyde leads to 3-nitro-5-chloromethylsalicylaldehyde, the chlorine atom in which is smoothly replaced by a hydroxy or acetoxy group. The salicylaldehydes obtained condense with 1,3,3-trimethyl-2-methylene-indoline to give the corresponding photochromic indolinespirochromenes. The spectral-kinetics of the photochromic transformations of the spirochromenes are discussed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 196–199, February, 1978.