منابع مشابه
SELENIUM HETEROCYCLES XXXX [I] SYNTHESES OF 4- (2-PYRAZINYL) - 1, 2, 3: SELENADIAZOLE AND 4- (2-PYRAZILYL)' - l,2,3- THIADIAZOLE
Reaction of thionyl chloride with 2-acetyl-1- benzenesulfonylpyrrole semicarbazone (6 c) gave 4 - (1- benzenesulfonyl-2 - pyrrolyl) - 1, 2, 3 -thiadiazole (lc). Selenium dioxide oxidation of 2-acetylpyrazine semicarbazone (10) in acetic acid afforded 4- (2-pyrazinyl) - 1, 2, 3- selenadiazole (4). Reaction of thionyl chloride with compound 10 gave 4- (2-pyrazinyl) - 1, 2, 3- thiadiazole (3)....
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Let p be a prime and F a field, perfect if p > 2, containing a primitive pth root of unity. Let E/F be a cyclic extension of degree p and GE ⊳ GF the associated absolute Galois groups. We determine precise conditions for the cohomology group H(E) = H(GE ,Fp) to be free or trivial as an Fp[Gal(E/F )]module. We examine when these properties for H(E) are inherited by H(E), k > n, and, by analogy w...
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In the title compound, C(16)H(13)FO(4), the dihedral angle between the benzene rings is 84.28 (8)°. In the crystal, C-H⋯F and C-H⋯O hydrogen bonds link the mol-ecules to form a three-dimensional network. The crystal structure is consolidated by C-H⋯π inter-actions and short F⋯F contacts [2.7748 (14) Å] also occur.
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 2005
ISSN: 0108-7673
DOI: 10.1107/s0108767305080335