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Synthesis 2002(2): 0169-0171
DOI: 10.1055/s-2002-19794
SHORTPAPER
© Georg Thieme Verlag Stuttgart · New York

Pyridinium Dichlorobromate: A New Stable Brominating Agent for Aromatic Compounds

Hussni A. Muathen*
Department of Chemistry, Umm Al-Qura University, P.O. Box 7283, Makkah, Saudi Arabia
e-Mail: hussnimuathen@yahoo.com;
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Publikationsverlauf

Received 2 October 2001
Publikationsdatum:
03. August 2004 (online)

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Abstract

Pyridinium dichlorobromate (PyHBrCl2, 1) is a new example of iminium-trihalide complexes. The compound is prepared from pyridine and chlorine in the presence of aqueous hydrogen bromide. The crystalline trihalide is quite stable and acts as a safe source of positive bromine. It shows a remarkable reactivity towards aromatic compounds compared with other bromine complexes. It is also considered as a potential source for bromine chloride BrCl.

Key words

pyridinium dichlorobromate - bromination - bromine chloride - aromatic compounds

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