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http://hdl.handle.net/10773/19830
Title: | Synthesis and characterization of 4-(dimethylaminopyridyl)chalcogenides (Se, Te): X-ray structure of bis(4-dimethylamino-2-pyridyl) diselenide, bis(4-dimethylamino-2-pyridylselenenyl)methane and 4-dimethylamino-2,6-bis(methylselenenyl)pyridine |
Author: | Dhau, Jaspreet S. Dhir, Rupy Singh, Amritpal Brandao, Paula Felix, Vitor |
Keywords: | PYRIDYLSELENO GROUP SELENIUM-COMPOUNDS CRYSTAL-STRUCTURE COMPLEXES |
Issue Date: | 2013 |
Publisher: | ELSEVIER SCIENCE SA |
Abstract: | The utility of BF3-aided lithiation of 4-dimethylaminopyridine (1) with lithium diisopropylamide (LDA) or lithium tetramethylpiperidide (LTMP) in the synthesis of 4-(dimethylaminopyridyl)chalcogenides (Se, Te) has been studied. The lithiation of the in situ generated 4-dimethylaminopyridine-BF3 adduct (2) with LTMP (1.1 eq.) followed by chalcogen insertion and electrophilic quenching reaction afforded the corresponding pyridylchalcogenides in excellent yields. The use of LDA with a modified procedure gave pyridylchalcogenides in yields comparable to that obtained with LTMP. Single crystal X-ray studies of bis(4-dimethylamino-2-pyridyl) diselenide (6), bis(4-dimethylamino-2-pyridylselenenyl) methane (9) and 4-dimethylamino-2,6-bis(methylselenenyl)pyridine (11) have also been reported. The structural analysis reveals a rare cis, trans conformation among the bis(2-pyridyl) diselenides in 6 and pi center dot center dot center dot pi stacking interactions between the pyridine rings in 9. (C) 2013 Elsevier B. V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19830 |
DOI: | 10.1016/j.ica.2013.04.020 |
ISSN: | 0020-1693 |
Publisher Version: | 10.1016/j.ica.2013.04.020 |
Appears in Collections: | CICECO - Artigos |
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