1-Ferrocenylcyclopropene and 1-ferrocenylcyclopropyl cation
摘要:
Dehydrobromination of cis and trans isomers of 1-bromo-2-ferrocenylcyclopropanes affords 1-ferrocenylcyclopropene. Its protonation with HBF4 results in 1-ferrocenylcyclopropylium tetrafluoroborate, which alkylates N,N-dimethylaniline in para position to yield 1-(p-dimethylaminophenyl)-l-ferrocenyleyclopropane. 1-Ferrocenylcyclopropene reacts with 1,3-diphenylisobenzofuran to give the classical [4+2]-cycloaddition product. Its structure as exo-2-ferrocenyl-1,5-diphenyl-6,7-benzo-8-oxatricyclo[3.2.1.0(2,4)] oct-6-ene was established based on the data from X-ray diffraction analysis. (C) 2002 Elsevier Science B.V. All rights reserved.