Toward Daisy Chain Polymers: “Wittig Exchange” of Stoppers in [2]Rotaxane Monomers
作者:Stuart J. Rowan、Stuart J. Cantrill、J. Fraser Stoddart、Andrew J. P. White、David J. Williams
DOI:10.1021/ol9913587
日期:2000.3.1
ammonium ion/crown ether-based [2]rotaxane monomers-each incorporating (i) a dumbbell-shaped component, possessing an exchangeable benzylic triphenylphosphonium stopper, and (ii) a ring component, bearing an aldehyde function-undergo a sequence of Wittig reactions in which the surrogate triphenylphosphonium stopper is exchanged for a ring component either (i) in the same rotaxane molecule to give cyclic daisy