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Lewis‐Base Adducts of Methyleneboranes
Author(s) -
Lukasch Heidi,
SchmidtLukasch Günter,
Lippold Uwe,
Berndt Armin
Publication year - 1988
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198809601
Subject(s) - adduct , chemistry , pyridine , benzene , character (mathematics) , aryl , lewis acids and bases , boranes , medicinal chemistry , methylene , double bond , base (topology) , stereochemistry , boron , organic chemistry , alkyl , geometry , mathematics , catalysis , mathematical analysis
The intensely colored pyridine adducts 2, which were obtained from the haloboranes 1 via the THF adducts can be described as methylene boranes whose electron‐deficiency is balanced out intramolecularly. The double bond character of the CB bond manifests itself for example in the different chemical shifts of the two benzene moieties of the fluorenylidene skeleton R 2 C. The shift observed for C9, however, also suggests great importance for the resonance structure A (Aryl = 2,4,6‐triisopropyl‐, 2,3,5,6‐tetramethyl‐, 2,4,6‐trimethylphenyl).