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Syntheses with stable isotopes: Acetic-1-13C,-2-13C,-13C2, and -12C2 acids

✍ Scribed by Donald G. Ott; Vernon N. Kerr

Publisher
John Wiley and Sons
Year
1976
Tongue
French
Weight
260 KB
Volume
12
Category
Article
ISSN
0022-2135

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✦ Synopsis

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.

📜 SIMILAR VOLUMES

Syntheses with stable isotopes: Urea-13C
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## 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~.

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## 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__‐lithioe

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## 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: Methanol
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## 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.

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## 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

Syntheses of [2-13C] and [1,2-13C] label
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The syntheses of a-ketoC2-' 3C]glutaric acid and a-ketoC1,2-' 'Cl glutaric acid were each achieved from commercial "CH,I in 5 steps. CH,NO,, prepared in situ from "CH,I and AgNO,, was treated with magnesium methyl carbonate, followed by acidified methanol to give 0,N13CH,C0,CH3. Michael addition to