## Abstract Two types of multi‐labelled urocanic acids with stable isotopes, __i.e.__, [3‐^2^H,1′,3′‐^15^N~2~]urocanic acid and [2,3,5′‐^2^H~3~,2′‐^13^C,1′,3′‐^15^N~2~]urocanic acid were synthesized by the enzymatic reaction of DL‐[3,3‐^2^H~2~,1′,3′‐^15^N~2~]histidine or DL‐[2,3,3,5′‐^2^H~4~,2′‐^13
Preparation of methyl nitrate and nitromethane labelled with nitrogen-15 and oxygen-18
✍ Scribed by A. P. Cox; S. Waring
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- French
- Weight
- 157 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
Methods are presented for the preparation on 10^−3^ mole scale of nitromethane and methyl nitrate enriched with oxygen‐18 or nitrogen‐15. Enrichment in each atomic position is discussed.
📜 SIMILAR VOLUMES
## Abstract Complexes of lanthanoid trinitrates Ln(NO~3~)~3~ with 15‐crown‐5 ether **1** (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd) and with 18‐crown‐6 ether **2** (Ln = La, Ce, Pr, Nd) having a 1:1 stoichiometry as well as 4:3 complexes with **2** (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd) have been synthesized and
## Abstract Nitrogen‐15 labeled butyl 4,5,6,7‐tetrahydro‐2__H__‐isoindoIe‐1‐carboxylate was prepared __via__ butyl iso‐cyanoacetate from ^15^N‐glycine in an overall 46% yield. This bicyclic intermediate was converted into nitrogen‐15 and carbon‐13 labeled 2,3:7,8:12,13:17,18‐tetrabutanoporphyrin, a
Methyl-(p-iodophenyll-pentadecanoic acid 5 labelled with carbon-14 in the carboxyl group was obtained in 38% radiochemical yield in five steps from Na 1 4 CN a t a specific radioactivity of 0.084 mCi/mg, 38.6 mCi/mmol.
In order to obtain a useful model system for the sedimentary tetrahydrobenzoporphyrins the title compound (X) is synthesized via an efficient approach, which is a practical alternative for the synthesis of such substances. Mono-labeling of (X) is achieved in an identical way using only (I) or (IX) i