## Abstract High specific activity ethanedial‐1,2‐^14^C~2~ has been prepared in 74% radiochemical yield by oxidation of paraldehyde‐^14^C~6~ with selenious acid. The crude ethanedial‐^14^C~2~ was directly condensed with 1, 2, 4‐benzenetriamine dihydrochloride in aqueous sodium carbonate giving 6‐qu
Synthesis of some 2,3-14C-quinoxaline derivatives
✍ Scribed by Walfred S. Saari; William C. Lumma Jr.
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- French
- Weight
- 179 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
✦ Synopsis
6-Chloro-1H-quinoxalin-2-one-2, 3-14C was prepared by the novel condensation of 4-chloro-1,2-phenylenediamine with glyoxylic acid-I4C (U) .
transformed further into 2,6-dichloroquinoxaline-2, 3-14C and 6-chloro-2-(1 '-piperazinyl) -quinoxaline-2,3-I4C.
📜 SIMILAR VOLUMES
## Abstract Isoxazole derivatives, 3‐sulfanilamido‐5‐methylisoxazole (I) and 3,3‐dimethyl‐1‐(5‐methyl‐3‐isoxazolylcarbonyl)‐urea (II), have been labelled with carbon‐14. The carbon‐14 label was incorporated into the C‐5 of the isoxazole ring to give (I) and (II) in 22.3% and 33.0% radiochemical yie
## Abstract By diazotization of 3‐(2‐aminophenyl)‐1,2‐dihydroquinoxaline 1c, its 3‐(4‐aminophenyl)‐isomer**2c**, 3‐(2‐aminobenzyl)‐1,2‐dihydroquinoxaline‐2‐one **3c** and its 3‐(4‐aminobenzyl)‐isomer **4c** and by azo coupling of formed diazonium salts with ethyl cyanoacetylcarbamate, corresponding
## Abstract A ^14^C labelled form of 6‐nitro‐7‐sulfamoylbenzo[f]quinoxalin‐2,3‐dione [1] was synthesized in two steps from 1,2‐diamino‐5‐sulfamoylnaphthalene [2] and 30 mCi ^14^C‐oxalic acid. A total of 5.5 mCi was isolated as a yellow solid with a radiochemical purity > 99%. The specific activity