X-ray study of the hetero ring flexibility in trans-5,6- trimethylene- and tetramethylene-5,6-dihydro 2-phenyl-[4H]-1,3-thiazines
✍ Scribed by Gy. Argay; A. Kálmán; L. Simon; G. Bernáth
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 630 KB
- Volume
- 140
- Category
- Article
- ISSN
- 0022-2860
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Stereochemical effects on the electron-impact (El)-induced fragmentation of cis/trans-and diendo/diexo-fused stereoisomers of several 2,3dihydrothiazolo[3,2+]pyrimidin-5-ones and 3,4-dihydropyrimido[2,1-b]thiazinh n e s annelated to various saturated and unsaturated carbocycles were studied. The ret
X-ray crystallographic analyses are reported for the two title compounds (8 and 9), of which the former crystallized in two modifications (8n and 8b). In all three structures, the pyranose rings have the %, (D) conformation and the substituents at C-l are axial and those at C-24-4 are equatorial. Th