## Abstract A three‐step synthesis of thymlne‐2,6‐^13^C~2~ from urea‐^13^C, sodium cyanide‐^13^C, and α‐bromopropionic acid is described. The last reaction involves hydrogenation of α‐cyano‐^13^C‐propionylurea‐^13^C in aqueous acetic acid and produces thymine‐2,6‐^13^C~2~ in 50–60% yield. The mecha
Syntheses with stable isotopes: Acetylene-13C2 and lithium acetylide-13C2 ethylenediamine complex
✍ Scribed by Thomas W. Whaley; Donald G. Ott
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- French
- Weight
- 254 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
Acetylene‐^13^C~2~ has been prepared from carbon‐^13^C dioxide and molten lithium following hydrolisis of the resulting lithium carbide‐^13^C~2~. The stable ethylenediamine complex of lithium acetylide‐^13^C~2~ has been obtained from the reaction of acetylene‐^13^C~2~ with N‐lithioethylenediamine.
📜 SIMILAR VOLUMES
## Abstract Rhodium‐catalyzed carbonylation of methanol at mild temperature and pressure has been developed for small‐ and large‐scale preparations of the carbon isotope isomers of acetic acid.
## Abstract Urea has been prepared from the reaction of carbon monoxide and ammonia in the presence of sulfur. The reaction has been applied to the synthesis of urea‐^13^C, urea‐^12^C, and urea‐^13^C‐^15^N~2~.
## Abstract Hydrogenation of carbon dioxide at mild temperature and preasure utilizing a copper‐zinc‐chromium catlyst has been developed for small‐ and large‐scale preparations of methanol and is applicable to various isotope isomers.
## Abstract Hydrogenation of carbon‐^13^C dioxide over ruthenium‐on‐alumina catalyst at 300–400°C produced methane‐^13^C, which was passed with excess ammonia over platinum at 1000°C to give, after absorption of the product in sodium hydroxide solution, sodium cyanide‐^13^C in 90% overall yield. Me
## Abstract A synthesis of oleic‐1‐^13^C acid and its conversion to triolein‐1′,1″,1″′‐^13^C~3~ are described. 9‐Octadecynenitrile‐1‐^13^C was prepared from 1‐bromo‐8‐heptadecyne and sodium cyanide‐^13^C. Hydrolysis afforded stearolic‐1‐^13^C acid, which was reduced to oleic‐1‐^13^C acid by the act