Synthesis and photochromic properties of 1,2-dicyano[2.n]metacyclophan-1-enes
作者:Michinori Takeshita、Takehiko Yamato
DOI:10.1016/s0040-4039(01)00725-0
日期:2001.6
Novel synthesis and the photochromic properties of 1,2-dicyano[2.n]metacyclophan-1-enes are reported. The intramolecular cyclization of bis(cyanomethyl)arenes successfully afforded 1,2-dicyano[2.n]metacyclophan-1-enes in good yield. The obtained cyclophanes show photochromism and the lifetime of the colored form is dependent on the chain length (n).
Syntheses and photochromic properties of 1,2-dicyano[2.n]metacyclophan-1-enes are described. Dicyanometacyclophan-1-enes have been prepared by novel intramolecular coupling reaction of 1,n-bis[(cyanomethyl)phenyl]alkanes in the presence of phase transfer catalyst. The photocyclization reaction of the prepared metacyclophan-1-enes took place upon irradiation with UV light and the pale yellow solution