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http://hdl.handle.net/10773/19179
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Dhau, Jaspreet S. | pt |
dc.contributor.author | Dhir, Rupy | pt |
dc.contributor.author | Singh, Avtar | pt |
dc.contributor.author | Singh, Amritpal | pt |
dc.contributor.author | Brandao, Paula | pt |
dc.contributor.author | Felix, Vitor | pt |
dc.date.accessioned | 2017-12-07T19:03:39Z | - |
dc.date.issued | 2014 | pt |
dc.identifier.issn | 0040-4020 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19179 | - |
dc.description.abstract | The lithiation of N,N,N',N'-tetraisopropylpyridine-2,6-dicarboxamide (1) and its application in the synthesis of chalcogen (Se/Te) derivatives was investigated. It was found that the selectivity of the reaction changed with the change in the amount of n-BuLi used. The lithiation of 1 with 6.1 equiv of n-BuLi followed by subsequent reactions with selenium/tellurium and iodomethane exclusively afforded the monosubstituted chalcogen derivative (2a/2b) in excellent yield. However, the use of 2.1 or 4.2 equiv of n-BuLi gave two additional products along with 2a/2b. One of the isolated products corresponded to the double lithiation of 1 and the other to the ortho lithiation followed by nucleophilic addition of n-BuLi to the one of the two carbonyl moieties. The prepared compounds have been characterized by single crystal X-ray crystallography, NMR (H-1, C-13, Se-77 and Te-125), IR, UV-Visible and Mass spectroscopy. Crystal structure of N,N,N',N'-tetraisopropyl-3,5-bis(methyltelluryl)pyridine-2,6-dicarboxamide (3b) reveals a strong intramolecular C center dot O center dot center dot center dot Te secondary and intermolecular Te center dot center dot center dot pi pyridyl interactions. (C) 2014 Elsevier Ltd. All rights reserved. | pt |
dc.language.iso | eng | pt |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | CENTER-DOT-N | pt |
dc.subject | CONVENIENT SYNTHESIS | pt |
dc.subject | HALOGEN-DANCE | pt |
dc.subject | SE | pt |
dc.subject | CHEMISTRY | pt |
dc.subject | DISELENIDE | pt |
dc.subject | ARYL | pt |
dc.title | Lithiation of N,N,N ',N '-tetraisopropylpyridine-2,6-dicarboxamide: synthesis, characterization and single crystal X-ray studies of chalcogen (Se/Te) derivatives of N,N,N ',N '-tetraisopropylpyridine-2,6-dicarboxamide | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 4876 | pt |
degois.publication.issue | 33 | pt |
degois.publication.lastPage | 4883 | pt |
degois.publication.title | TETRAHEDRON | pt |
degois.publication.volume | 70 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.tet.2014.05.066 | pt |
dc.identifier.doi | 10.1016/j.tet.2014.05.066 | pt |
Appears in Collections: | CICECO - Artigos |
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