End-capping of a pseudorotaxane via Diels-Alder reaction for the construction of C60-terminated[2]rotaxanes

[GRAPHICS] The Diels-Alder reaction of various dienophiles such as C-60 with a pseudorotaxane having a sultine moiety afforded corresponding [2]-rotaxanes in moderate yields. The introduction of a porphyrin moiety on the wheel component considerably enhanced the efficiency of the end-capping reaction with C-60.