ISSN:
0749-1581
Schlagwort(e):
119Sn substituent chemical shifts
;
10-Substituted-9-trimethylstannyltriptycenes
;
Polar substituent effects
;
Through-bond transmission
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
A series of 10-substituted(X)-9-trimethylstannyltriptycenes (2a) were synthesized and characterized and the 119Sn chemical shifts measured. Comparisons were made of the 119Sn substituent chemical shifts (SCS) of 2a and the corresponding values of 4-substituted(X)bicyclo[2.2.2]oct-1-yltrimethylstannanes (1a), which confirm the previous conclusion that ‘through-three-bond’ effects or double-hyperconjugation strongly regulate the 119Sn shifts of the latter system. A more restricted series of 10-substituted(X)-9-methyltripycenes (2c) were acquired and their 13CH3SCS compared with those of the corresponding bicyclo[2.2.2]octanes (1c). Significant ‘through-bond’ contributions are also indicated for the latter system.
Zusätzliches Material:
6 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/mrc.1260290416
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