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13C-NMR Spectra of Tribromomethyllithium and 1,1-Dibromoethyllithium

✍ Scribed by Dr. Herbert Siegel; Kurt Hiltbrunner; Prof. Dr. Dieter Seebach

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
232 KB
Volume
18
Category
Article
ISSN
0044-8249

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✦ Synopsis

with sulfur-and phosphorus-substituted carbanionoid cent e r ~[ ' ~' (AS ca. -10 to + 10). Replacement of H by Br leads in the Li derivatives (2)-(4) (AShd=70-90) to a four-to five-fold greater downfield shift than that in the H compounds (AS,, = 14-24). Thus it may be concluded that considerable weakening (54 of the CBr bond['41 or even rehy-(7), (53 6 = 210 bridization (56) have taken place in the cyclopropylidene carbenoids, cf. ( 0 ) shift in (6)[IZ1 and (7)[15]. Further studies['*' (variation of halogen and metal, measurement of I3C- "C coupling constants, etc.) are necessary to obtain more precise information["].

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