Abstract
A dialkyl-substituted dodecahexayne derivative of 15,17,19,21,23,25-tetracontahexayne (THY) was found to polymerize spontaneously in the solid state at ambient temperature without irradiation. The polymerization ofthe THY crystals was monitored by IR and visible-near IR absorption, 13 C NMR and ESR spectra, and X-ray diffraction. The following polymerization scheme is proposed. First, a polydiacetylene substituted by alkyl and 1,3,5,7-alkatetraynyl groups is formed by 1,4-addition polymerization of the dodecahexayne moiety. Next, polymerization occurs at the 9,12-positions (on the opposite side) of the original dodecahexayne moiety to give a ladder polymer of two polydiacetylenes bonded by butadiynylene groups
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