Direct  13 C‐NMR Spectroscopic Observation of Cyclopropylidene Bromolithiocarbenoids | Zendy

Seebach Dieter | Zendy; Siegel Herbert | Zendy; Müllen Klaus | Zendy; Hiltbrunner Kurt | Zendy

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Direct 13 C‐NMR Spectroscopic Observation of Cyclopropylidene Bromolithiocarbenoids

Author(s) -

Seebach Dieter,

Siegel Herbert,

Müllen Klaus,

Hiltbrunner Kurt

Publication year - 1979

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.197907841

Subject(s) - carbanion , chemistry , carbene , carbon 13 nmr , nuclear magnetic resonance spectroscopy , derivative (finance) , crystallography , stereochemistry , catalysis , organic chemistry , financial economics , economics

The nature of the cabenoid 1‐bromo‐1‐lithiocyclopropanes has been examined with 13 C‐labeled compounds at −100°C by 13 C‐NMR spectroscopy. The pronounced downfield shifts of the cabenoid C signsl suggest considerable weakening of the CBr bond (1) or even rehybridization (2) . Thus a LiBr‐complexed carbene appears more likely than a carbanion derivative.

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