## Abstract Condensation of aromatic carboxaldehydes with [2‐^14^C]‐__malonic acid under Knoevenagel conditions provides corresponding β‐aryl substituted__ [α‐^14^C]‐acrylic acids. The reaction is applicable to both aromatic and heteroaromatic aldehydes under controlled reaction conditions leading
A new approach to the synthesis of 14C labelled DL-malic acid
✍ Scribed by T. V. Ramamurthy; K. V. Viswanathan
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- French
- Weight
- 163 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
The 2‐carbon units, glycine and glyoxylate are combined by a mild reaction via the copper chelate of glycine. The resulting β‐hydroxy aspartic acid is converted to DL‐malic acid by means of hydroxylamine 0‐sulfonic acid. The overall yields are in the range of 35–50% in submillimolar preparations.
📜 SIMILAR VOLUMES
## Abstract A convenient method for the synthesis of phenylmethyl N‐methyl (carboxy‐^14^C) glycine hydrochloride (Z) is described. It involves the carboxylation of transmetalated organostannane compound 4 which itself is accessible by established procedure. Success in preparing the labelled amino a
14C-labeled chlorogenic acid (specijic activity 30.6 nCilmg) was synthesized by reaction of diphenylmethyl-I-0-ethoxy-carbonyl- 4,5-0-isopropylidenequinate ( V ) with 0,O-dimethylcarbonyl caffeoyl chloride-u-14C (VIII) followed by selective hydrolysis of the protecting groups.
## Abstract p‐Toluic acid‐ring‐^14^C was synthesized by the Friedel‐Crafts p‐carbamylation of toluene‐ring‐^14^C with N,N‐disubstituted carbamyl chloride and subsequent hydrolysis. The radiochemical yield was 61%. An attempt was made to apply this method for the synthesis of benzoic acid‐ring‐^14^C
## Abstract A convenient gas catalytic process has been developed for the synthesis of radioactive alkali cyanides on micro or semimicro scale. The carbon content of barium carbonate used as starting material can be quantitatively transformed into potassium cyanide in a simple process.