✍ Scribed by Zhongping Jiang; Zuo Xiao; Gaihong Zhang; Liangbing Gan; Dian Wang; Wenxiong Zhang
No coin nor oath required. For personal study only.
Trimethylsilyl azide adds to the carbonyl carbon in a cage-opened fullerene derivative to form the first fullerenyl azide compound. The fullerene-bound azido group exhibits some unusual reactivity compared with that exhibited by other organic azido compounds. Heating the azidofullerene at 100 °C only led to the cleavage of peroxo groups in the compound, whereas the azido group remained unchanged. Triphenylphosphine reacted with the azido group to form isolable iminophosphorane, which could not be hydrolyzed under normal acidic and basic conditions.
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In general, two main strategies have been explored to synthesize rotaxanes (Scheme 14.1 ): the fi rst one is the double -stoppering approach. After threading of a string -like fragment through a ring using non -covalent interactions, a double -stoppering reaction produces the desired rotaxane. Usual