Synthesis, structure and some properties of 2,5,7,10-tetraiodo-1,6-methano[10]annulene
摘要:
The title compound (1a) was prepared by a two-step procedure via an organomercurial. Both 1a and its 11,11-difluoro analogue are crystalline solids that were fully characterized. The tetraiodidle 1a is unusual in that the aromatic character of the pi periphery is almost destroyed as determined from ring current effects on the 11,11 hydrogen atoms. The crystal structure of 1a is reported and it bears out the ''localization'' of the pi electrons with a concomitant opening of the transannular bridge angle.