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One‐Pot Synthesis of Pyridyltellurium Derivatives from a Reaction with Isopropylmagnesium Chloride and X‐ray Crystal Structures of Various Pyridyl Ditellurides
Author(s) -
Bhasin Kuldip K.,
Arora Veena,
Klapötke Thomas M.,
Crawford MargaretJane
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400297
Subject(s) - chemistry , x ray , crystal structure , chloride , crystallography , combinatorial chemistry , organic chemistry , physics , quantum mechanics
A one‐pot synthesis of various symmetrical and unsymmetrical 2‐pyridyl‐, 2‐bromo‐5‐pyridyl‐, and 2,5‐dibromo‐3‐pyridyltellurium compounds has been carried out, at room temperature, by selective single bromine‐magnesium exchange of 2‐bromo‐, 2,5‐dibromo‐ and 2,3,5‐tribromopyridine, respectively, with isopropylmagnesium chloride. This exchange reaction gives the corresponding pyridylmagnesium chlorides, which, upon insertion of elemental tellurium (activated), give the pyridyltelluromagnesium chlorides, and, subsequently, the corresponding dipyridyl ditellurides upon aerial oxidation. The pyridyltelluromagnesium chlorides give unsymmetrical pyridyltellurium derivatives in good yield upon treatment with alkyl halides. The X‐ray crystal structures of bis(2‐pyridyl) ditelluride, bis(2,5‐dibromo‐6‐methyl‐3‐pyridyl) ditelluride and bis(2,5‐dibromo‐3‐pyridyl) ditelluride are discussed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)