## Abstract A representative group of steroids have been labelled by exchange using ethylaluminium chloride and boron tribromide as catalyst and a trace of high specific activity tritiated water as isotope source. Careful choice of experimental conditions and a solvent inert to this exchange system
The use of boron tribromide as a catalyst for the rapid tritium labeling of aromatic compounds
β Scribed by John L. Garnett; Mervyn A. Long; Christopher A. Lukey
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- French
- Weight
- 245 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
β¦ Synopsis
Boron t r i b r o m i d e has been assessed as a c a t a l y s t f o r r a p i d t r i t i u m l a b e l i n g o f organic compounds using t r i t i a t e d water under m i l d conditions. A1 k y l and halogen s u b s t i t u t e d aromatics l a b e l e d r a p i d l y , t h e l a b e l i n g being most pronounced i n t h e o r t h o and para p o s i t i o n s . Compounds c o n t a f n i n g e l e c t r o p h i l i c d e a c t i v a t i n g groups were found t o be d i f f i c u l t t o l a b e l . Very 1 i t t l e byproduct formation was observed.
π SIMILAR VOLUMES
## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract Boron tribromide is presented as a highly reactive reagent that __simultaneously__ allows the demethylation and fully diastereoselective cyclization of different precursor molecules, obtained by an aldolβtype reaction, to a series of hydroxylated aryldihydrobenzofuran systems in racemic