18 research outputs found
Dropout From an eHealth Intervention for Adults With Type 2 Diabetes: A Qualitative Study
Selenium-Containing heterocycles from isoselenocyanates: synthesis of 5-Amino-2,4-dihydro-3H-1,2,4-triazole-3-selones
The reaction of S-methylisothiosemicarbazide hydroiodide (= S-methyl hydrazinecarboximidothioate hydroiodide; 1), prepared from thiosemicarbazide by treatment with MeI in EtOH, and aryl isoselenocyanates 5 in CH2Cl2 affords 3H-1,2,4-triazole-3-selone derivatives 7 in good yield (Scheme 2, Table 1). During attempted crystallization, these products undergo an oxidative dimerization to give the corresponding bis(4H-1,2,4-triazol-3-yl) diselenides 11 (Scheme 3). The structure of 11a was established by X-ray crystallography
Dynamic evaluation of fluid shifts during normothermic and hypothermic cardiopulmonary bypass in piglets
Selenium-containing heterocycles from isoselenocyanates: synthesis of 2-methylidene-1,3-selenazolidine derivatives
A convenient and unequivocal synthesis of the title compounds from isoselenocyanates, malononitrile or 2-cyanoacetate, and 1,2-dibromoethane or a-halogenated carboxylic acid derivatives is reported. The proposed reaction mechanism involves in situ cyclization of different halogenated compounds with an intermediate keten-N,Se-acetal, generated by the base promoted nucleophilic addition of the acidic cyanomethylenes to aliphatic and aromatic isoselenocyanates. Chemical and spectroscopic evidence for the structures of the new compounds is presented
Ethnobotanical and ethnopharmacological studies of medicinal and aromatic plants used in the treatment of metabolic diseases in the Moroccan Rif
Plant growth, yield and bioactive compounds of two culinary herbs as affected by substrate type
Analytical Solution for Discrete Lumped Kinetic Equations in Hydrocracking of Heavier Petroleum Fractions
Selenium-containing heterocycles from Isoselenocyanates: Synthesis of 1,3-Selenazinane and 1,3-Selenazinanone derivatives
The reaction of the intermediate ketene N,Se-hemiacetal 3, prepared from cyanomethylene derivatives 1 by treatment with Et3N and aryl isoselenocyanates 2, with bis-electrophiles 6, 7, 9, and 11 in DMF affords tetrahydro-1H-1,3-selenazine (= 1,3-selenazinane) derivatives 8, 10, and 12 in good yield (Scheme 2 and Tables 1 – 3). Chemical and spectroscopic evidence for the structures of the new compounds are described. The structures of 8d and 12e are established by X-ray crystallography (Figs. 1 and 2)