About the Li ⊕ Gegenion Effect on α‐Sulfonyl Carbanions
1990; Wiley; Volume: 29; Issue: 1 Linguagem: Inglês
10.1002/anie.199001001
ISSN1521-3773
AutoresHans‐Joachim Gais, Günther Hellmann, Hans Jörg Lindner,
Tópico(s)Organophosphorus compounds synthesis
ResumoTo what extent do the structure and dynamics of the α‐sulfonyl carbanion l ⊖ depend on the gegenion? As shown by the X‐ray structure analyses of the lithium‐ and tetrabutylammonium salts, these are present in the crystal as a dimer ( 1 ⊖ /Li ⊕ · 2THF) 2 with an eight‐membered (SOLiO) 2 ring and as a monomer 1 ⊕ /NBu 4 with discrete cations and anions, respectively. In contrast, the C α S rotation barrier of 1 ⊖ is hardly influenced by NBu (in THF or DMSO) and K ⊕ (in DMSO). equation image
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