Magnetic susceptibility of layered 2H-WSe2 semiconductors

Magnetic susceptibility and anisotropy in magnetic susceptibility _L are studied in 2H-WSe₂ layered semiconductor crystals over the temperature interval 77–300 K and magnetic fields 1–10 kOe.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 20–23, November, 1989.The authors are indebted to L. P. Strakhov for his kind evaluation of the results of the study.     

The reaction of carboxamidines with oxalyl chloride

The action of oxalyl chloride on amidines has given imidazoline-4,5-dione hydrochlorides. The reactions of the imidazoline-4,5-diones and their hydrochlorides with water, alcohols, and amines have been studied. In these reactions the imidazoline ring readily opens with the formation of derivatives of oxaminic acid.For Communication II, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, Vol. 6, No. 6, pp. 814–818, June, 1970.     

Thionylamides and thionylamidines of carboxylic acid

Amidines of carboxylic acids react with thionyl chloride to form thionylamidines which are converted spontaneously into 2H-1, 2, 4-benzothiadiazine 1-oxides. Carbimidic esters react with thionyl chloride to give thionylamides as final products.     

The synthesis and structure of 1,3,4-trisubstituted 2,5-dioxopyrrolidines and their behaviour in liquid crystalline systems

To find novel compounds for liquid crystalline mixtures with improved properties, a series of optically active 1,3,4-trisubstituted 2,5-dioxopyrrolidines has been prepared. Their structure was confirmed by IR spectroscopy. The twisting ability of the compounds prepared was studied.     

A reproducing kernel space model for -functions

A new model for generalized Nevanlinna functions will be presented. It involves Bezoutians and companion operators associated with certain polynomials determined by the generalized zeros and poles of . The model is obtained by coupling two operator models and expressed by means of abstract boundary mappings and the corresponding Weyl functions.

     

Flavonoids of inflorescences of Calendula officinalis

By column chromatography on polyamide sorbent, the inflorescences of pot marigold calendula have yielded eight substances of flavonoid nature: two aglycons — quercetin (C₁₅H₁₀O₇, mp 309–311°C) and isorhamnetin (C₁₆H₁₂O₇, mp 314–316°C); six glycosides, of which three have been identified as isoquercetin (C₂₁H₂₀O₁₂, [] _D ²⁰ –36° in methanol, mp 218–220°C), isorhamnetin 3-O--D-glucoside (C₂₂H₂₂O₁₂, [] _D ²⁰ –59° in dimethylformamide, mp 193–195°C), narcissin (C₂₈H₃₂O₁₆, [] _D ²¹ –28° in dimethylformamide, mp 180–182°C), and three substances that have proved to be new and have been called calendoflaside (C₂₈H₃₂O₁₅, [] _D ²¹ –85° in methanol, mp 192–195°C; calendoflavoside (C₂₈H₃₂O₁₆, [] _D ²⁰ –106° in methanol, mp 189–192°C), and calendoflavobioside (c₂₇H₃₀O₁₆, [] _D ²⁰ –105° in methanol, mp 194–197°C).All-Union Scientific-Research Institute of Drug Chemistry, Khar'kov. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 795–801, November–December, 1988.