Six-membered cyclic semiaminal as intermediate in the synthesis of thiazoles from thiosemicarhazide and α-haloketones

Cyclization of thiosemicarbazide with methyl 3-chloro-2-oxo-3-phenylpropionate in MeCN results in 5-hydroxy-2-imino-5-methoxycarbonyl-6-phenylperhydro-1,3,4-thiadiazine. The structure of the product has been confirmed using spectral (IR,¹H,¹³C,¹³C{¹H} NMR) methods and chemical transformations.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1962–1965, November, 1993.     

Infrared spectra of menthoxyalkylchloro-(alkoxy)silanes and chlorosilylpropionic and chlorosilylisobutyric acid menthyl esters

Conclusions The IR spectra of methyl- and phenylchloromenthoxysilanes, menthoxypropylalkylehlorosilanes, menthoxypropyl- and menthoxyethylmethylethoxysilanes, and also chlorosilylpropionic and chlorosilylisobutyric acid menthyl esters were studied. Assignments of the frequencies for a number of vibrations were made.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2151–2155, September, 1968.     

Phase transition and anisotropy of thermal expansion in TlInS2

Linear expansion coefficients parallel and perpendicular to the layer plane of TlInS₂ layer crystal were measured in the temperature range 20–250 K at T { 200 K a strong anomaly in α⊥ behaviour was observed—the value of α6 increased abruptly up to the 200 × 10^?6 K^?1 due to phase transition in this crystal. It was shown that there is no anomaly in the behaviour of linear expansion coefficient α_z.dfnc;. This fact allowed to conclude that the phase transition in TlInS₂ is caused by changes in interlayer distances.