Synthesis of Polyether Cyclophanes throu
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Ken Tanaka; Hiromi Sagae; Kazuki Toyoda; Keiichi Noguchi
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Article
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2006
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John Wiley and Sons
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English
β 191 KB
## Abstract Crossβcyclotrimerizations of etherβlinked Ξ±,Οβdiynes and dimethyl acetylenedicarboxylate in the presence of a catalytic amount of cationic rhodium(I)/H~8~βBINAP complex give [7]β[21]polyether cyclophanes in good yield. [8]β[9]Ester cyclophanes were also synthesized from the correspondin