Synthesis of 3H- and 14C-labelled doisynolic and marrianolic acids, and stability of tritium label
✍ Scribed by Nakuleswar Kundu; Yoshio Osawa
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- French
- Weight
- 231 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
^3^H‐ and ^14^C‐Labelled doisynolic acid was prepared from 6,7‐^3^H‐, 2,4,6,7‐^3^H‐ and 4‐^14^C‐labelled oestradiol and oestrone by a regulated alkali fusion. Labelled marrianolic acid was similarly prepared from labelled oestriol. Unstability of regiospecific tritium labels in alkali was observed by use of double labelled compounds.
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A synthesis of dibucaine labeled with l"C in the heterocyclic ring is described. starting with isatin and acetic anh~dride-2-~"C as shown in Scheme I. Two deutero analogs, dibucaine-d2 and dibucaine-dg, were also synthesized by the reactions shown in Scheme 11. Dibucaine-dg was synthesized by conden
## Abstract N‐[4‐]2‐(5‐Chloro ‐2‐methoxybenzamido) ethyl phenylsulfonyl N′ ‐cyclohexylurea, IXc, or glyburide, has been labeled with tritium and carbon‐ 14. The tritium label is located in the C‐3 position of the 5‐chloro ‐2‐methoxybenzoyl portion of the molecule, while the carbon‐14 label is incor
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3H-Sch 47949, racemic 3H-Sch 48461, was prepared at a specific activity of 40 mCi/mmole by Pt catalysed exchange with tritiated water. 3H-Sch 48461 was prepared at a specific activity of 64.6 Ci/mmole by a Pd/C catalysed reduction of an olefinic intermediate. 14C-Sch 48461 was prepared in 8 steps fr