Radical additions to di-tert-butylsulfur diimide and di-tert-butylcarbodiimide

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DOIResolve DOI: http://doi.org/10.1021/ja00432a032
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TypeArticle
Journal titleJournal of the American Chemical Society
ISSN0002-7863
Volume98
Issue16
Pages48794882; # of pages: 4
AbstractA variety of transient radicals, RnM·, add to di-tert-butylsulfur diimide to give a new class of nitrogen-centered radicals, N-aminothiyl-N-alkylamino radicals, Me3CṄSN(CMe3)MRn. The EPR parameters of these radicals indicate that the unpaired electron is located principally in the Nα 2pz orbital and that the α-tert-butyl group, the two nitrogens, and the sulfur lie in, or close to, the nodal plane of this orbital. These radicals decay with first-order kinetics, and some of them are very persistent. Radical addition to di-tert-butylcarbodiimide appears to be a less facile process, since only CF3O· gave a simple adduct, Me3CN=C(OCF3)ṄCMe3. This 1,3-diazaallyl radical decays with second-order kinetics; log (k/M-1 s-1) = (7 ± 1) - (2.5 ± 1.2)/θ, where θ = 2.3RT kcal/mol. Trimethysilyl radicals add to di-tert-butylcarbodiimide (and other carbodiimides), but only the extremely persistent (Me3Si)2ĊN(SiMe3)2 radical can be observed.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21276641
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Record identifier8c1613c8-a62a-4f45-af7a-7f6d4f22b81f
Record created2015-10-13
Record modified2016-05-09
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