## Abstract Reaction of adriamycinone with excess ^14^CH~3~Mgl and periodate cleavage of the resulting glycol (5) affords daunomycinone‐14‐^14^C (6). Bromination and hydrolysis of 6 gives adriamycinone‐14‐^14^C (8). Coupling of 6 and the 14‐0‐p‐anisyldiphenyl‐methyl derivative (9) with 1‐chloro‐3‐N
Synthesis of 14C-hydroxyurea with immobilized 14C-cyanate
✍ Scribed by Alfred M. Ajami
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- French
- Weight
- 173 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
A solution of hydroxylamine hydrochloride is passed over a column bed of Amberlite IRA‐400 pre‐loaded with ^14^CNO^−^ anions. ^14^C‐hydroxyurea is formed in 50% radiochemical yield after recrystallization. The product is not contaminated with iso‐hydroxyurea or other by‐products usually found in the reaction of hydroxylamine hydrochloride with aqueous potassium cyanate.
📜 SIMILAR VOLUMES
14-14C-Adriamycin HC1 has been prepared from unlabeled adriamycin. The 14C-Diazald served as the source of the label. This synthesis does not require protection of the phenolic hydroxyl groups.
The synthesis of lanosterol [la] and desmosterol [Ira] Iabeled with 14C in the 25 position by a Wittig reaction between triphenyl-214C isopropylidene-phosphorane [IVb] and the corresponding aldehydes are described. The specijic activities obtained are, respectively, 0.539 mClmM and 0.752 mClmM and t
14C labelled Metribuzine was synthetised in a five step synthesis firom sodium [l-14C]pivalate (trimethyl acetic acid) via o-brom0-[2-~~C]pinacoline (l-bromo-3,3-dimethyl-butan-2-on) and trimethyl [2-14C]pyruvic acid. The total yield was 30% (calculated on sodium pivalate).
## Abstract Hexazinone ‐ a s‐triazine type contact herbicide ‐ was labelled with ^14^C for the investigation of metabolic pathways. A convenient synthesis was elaborated for labelling of the carbon atom in the 6 position of the triazine ring. The molar activity of Hexazinone was 797.0 MBq/mmole (21