Synthesis and structure of [1,2]thiaphospholo[4,5-e][1,2,4]triazines
โ Scribed by Yehia A Ibrahim; Azza M Kadry; Maher R Ibrahim; J.N Lisgarten; B.S Potter; R.A Palmer
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- French
- Weight
- 278 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0040-4020
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โฆ Synopsis
The first syntheses of the novel [1,2]thiaphospholo[4,5-e][1)2,4]triazine ring system, exemplified by the derivatives 3a-c have been accomplished by the action of Lawesson's reagent on the 5-arylmethyl-l,2,4-triazin-6-ones la-ยข, their thiones 2a-c or the Mannich bases 4-6. The structure of these new thiaphospholotriazines was established mainly by NMR, and X-ray structural analysis.
๐ SIMILAR VOLUMES
Ethyl 1,2,4-triazine-5-carboxylates 6 were prepared by heating N,N-dimethylaminomethyleneor ethoxymethylenehydrazones 5 with ammonium acetate in acetic acid at-100ยฐC. NMR-studies confirmed the absence of their regio isomers (6-carboxylates), showing the high regioselectivity of this procedure. Rece