The syntheses of '%-ring labeled levamisole ([-)-2,3,5,6-tetrahydr0-6-phenyl[~'C-UL]imidazo(Z, 1b]thiole) from acetophenone-ring-UL-l'C in 5 steps plus resolution with a 7.5% overall yield, and %,-ring labeled tetramisole ([i]-2,3,5,6-tetrahydro-6-phenyif3 S ]imidaz0[2,?-bjthiazole) from benzene-'%,
Synthesis of 13C- and 14C-Labeled methanesulfinic and methanesulfonic acids
✍ Scribed by V. J. Feil; J. K. Huwe; D. M. Dulik; C. Fenselaum
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- French
- Weight
- 332 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
✦ Synopsis
The enzyme catalyzed displacement o f the methyl s u l f o n y l group from pentachlorophenyl methyl sulfone, the pchloroperoxybenzoic a c i d oxidation of methyl mercaptan and the reaction o f m e t h y l l i t h i u n with sulfur dioxide are methods described f o r the synthesis o f i s o t o p i c a l l y labeled methanesulfinic acid. The f i r s t two methods can be c a r r i e d out on a milligram scale and are suitable for high s p e c i f i c a c t i v i t y preparations while the l a t t e r method i s suitable for preparations on a gram scale. i s o t o p i c a l l y labeled methanesulfonic acid.
📜 SIMILAR VOLUMES
## Abstract ^13^C‐ and ^14^C‐uniformly labelled catechol was synthesized from phenol in three steps. Phenol was derivatized with 2‐chloro‐5‐nitrobenzophenone in THF containing NaH, followed by __ortho__‐hydroxylation with 35% aqueous H~2~O~2~ in sulphuric acid/glacial acetic acid solution, and by c
## Abstract This report describes the synthesis of the ^13^C‐enriched and ^14^C‐labelled title compound starting from isotopically labelled isovaleraldehyde.
## Abstract The preparation of [^3^H]Sch 727965 from unlabeled compound and tritiated water was base catalyzed. Diethyl [^13^C~3~]malonate was used to prepare [^13^C~3~]Sch 727965 in five steps in 21.8% overall yield. In a similar manner, [^14^C]Sch 727965 was prepared in five steps from diethyl [2
## Abstract Labeled silver carbonate was prepared from barium carbonate‐^13^C or ‐^14^C and aqueous silver nitrate in 95 to 100% yield. Diethyl carbonate‐^13^C or ‐^14^C was generated in 60 to 85% overall yield by treatment of labeled silver carbonate with ethyl iodide and tetraethylammonium iodide
## Abstract ^3^H‐Sch 58235 was prepared at a specific activity of 29.1 Ci/mmol by Ir(COD)(Cy~3~P)PyPF~6~ catalysed exchange with tritium gas. ^14^C‐Sch 58235 was prepared in three steps from __p__‐hydroxy[ring‐U‐^14^C]benzaldehyde with an overall radiochemical yield of 21%. ^13^C~6~‐Sch 58235 was s