posted on 2019-06-17, 00:00authored byMichio Yamada, Mayu Takizawa, Yoko Nukatani, Mitsuaki Suzuki, Yutaka Maeda
The single-step regio- and stereoselective
platinum-catalyzed reactions
of [60]fullerene with a series of 9-ethynyl-9H-fluoren-9-yl
carboxylates afforded fullerene–fluorene dyads in their [2
+ 2] cycloaddition forms. The presented reactions represent the first
examples of the use of easily accessible fluorenyl carboxylates as
fluorenylideneallene precursors. In addition, the single-crystal X-ray
structure of one of the dyads reveals a distorted cyclobutane ring.
Furthermore, the dyad forms a layered structure with close-packed
arrays of C60 spheres in its crystals.