## Abstract A simple and convenient method for the condensation of paminophenol (I) with ^14^C‐acetic anhydride (II) yields up to 76% of ^14^C‐labelled 4‐hydroxyphenylacetamide (carbonyl‐^14^C) (III). Typical synthesis time is 60 minutes. Radioactive yield is 51%, and specific activity is 0.22 μCi/
Synthesis of [Carbonyl-14c] labeled carbonate and carbamate esters
✍ Scribed by Munir N. Nassar; Bushra J. Agha; George A. Digenis
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- French
- Weight
- 344 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
✦ Synopsis
A two-step s y n t h e s i s of t h r e e carbonate and f o u r carbamate esters l a b e l e d a t t h e carbonyl with c a r n-14 i s described. The method u t i l i z e s t h e r e a d i l y a v a i l a b l e [' %I -phosgene which i s f i r s t converted t o an i s o l a b l e [14C] -labeled a l k y l o r a r y l chloroformate and subsequently r e a c t e d with t h e a p p r o p r i a t e a l c o h o l o r amine t o give t h e corresponding ester.
📜 SIMILAR VOLUMES
## Abstract Fluphenazine labelled with ^14^C at the 3‐propyl position was prepared. Starting from K^14^CN, 3‐chloropropyl p‐toluenesulfonate (7) was synthesized via 3‐chloropropionic acid (4) intermediate and coupled with 2‐trifluoromethylphenothiazine. The phenothiazine derivative (8) obtained was
## Abstract Labeled silver carbonate was prepared from barium carbonate‐^13^C or ‐^14^C and aqueous silver nitrate in 95 to 100% yield. Diethyl carbonate‐^13^C or ‐^14^C was generated in 60 to 85% overall yield by treatment of labeled silver carbonate with ethyl iodide and tetraethylammonium iodide
## Abstract Carbonyl sulfide (COS) was prepared by a replacement reaction from potassium thiocyanate (KSCN) in 50% sulfuric acid. ^14^C‐COS or ^35^S‐COS can be prepared by the same method, depending on the position of the label in the starting KSCN. The yield of the final product is in excess of 60
## Abstract Two labeled isotopomers of L‐tyrosine, L‐Tyr, have been synthesized using specific properties of the enzymes phenylanine ammonia lyase, PAL, and L‐phenylalanine hydroxylase. In an intermediate step [1‐^14^C]‐, and [2‐^14^C]‐L‐phenylalanine, L‐Phe, have been obtained from [1‐^14^C]‐, and