Regioselective synthesis of bis(2-halo-3-pyridyl) dichalcogenides (E = S, Se and Te): directed ortho-lithiation of 2-halopyridines

双(2-卤代-3-吡啶基)二硫属化物(E = S、Se 和 Te)的区域选择性合成:2-卤代吡啶的定向邻位锂化

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作者:K K Bhasin, Neelam Singh, Shivani Doomra, Ekta Arora, Ganga Ram, Sukhjinder Singh, Yogesh Nagpal, S K Mehta, T M Klapotke

Abstract

A novel method for the preparation of hitherto unknown symmetrical bis(2-halo-3-pyridyl) dichalcogenides (E = S, Se and Te) by the oxidation of intermediate 2-halo-3-pyridyl chalcogenolate, prepared by lithiation of 2-halo pyridines using lithium diisopropylamine is being reported. All the newly synthesized compounds have been characterized through elemental analysis employing various spectroscopic techniques, namely, NMR ((1)H, (13)C, (77)Se), infrared, mass spectrometry, and X-ray crystal structures in representative cases.

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