تعداد نشریات | 158 |
تعداد شمارهها | 6,230 |
تعداد مقالات | 67,764 |
تعداد مشاهده مقاله | 115,191,309 |
تعداد دریافت فایل اصل مقاله | 89,939,288 |
SELENIUM HETEROCYCLES XXXX [I] SYNTHESES OF 4- (2-PYRAZINYL) - 1, 2, 3: SELENADIAZOLE AND 4- (2-PYRAZILYL)' - l,2,3- THIADIAZOLE | ||
Journal of Sciences, Islamic Republic of Iran | ||
مقاله 9، دوره 1، شماره 4، آبان 1990 اصل مقاله (285.73 K) | ||
چکیده | ||
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). Base catalized decomposition of 4 afforded the cis-fulvene 13. Similarly, reaction of 3 with a base gave the corresponding cis-fulvene 11. Heating compounds 11 or 13 gave respectively the corresponding trans isomers 12 or 14. | ||
عنوان مقاله [English] | ||
- | ||
چکیده [English] | ||
- | ||
آمار تعداد مشاهده مقاله: 1,753 تعداد دریافت فایل اصل مقاله: 681 |