Add time:09/25/2019 Source:sciencedirect.com
Certain Group IVB derivatives of 1,6-methano[10]annulene have been synthesised, and their 13C nuclear magnetic resonance spectra recorded and assigned, to provide a measure of the substituent effects exerted by metalloid-containing groups in this non-benzenoid aromatic system. Comparisons are made with the corresponding naphthalene and some anthracene derivatives. Protiodemetallations of a number of arylsilanes and -stannanes have been examined, and in protiodestannylation by CH3CO2H/dioxane at 27°C (an electrophilic aromatic substitution) the α- (or 2-) position of 1,6-methano[10]annulene is ca. 35 times as reactive as the α (or 1-) position of naphthalene, whereas in protiodesilylation by CF3CO2H/CH3CO2H at 27°C it is ca. 700 times the more reactive.
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