کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5187302 | 1381126 | 2006 | 7 صفحه PDF | دانلود رایگان |
The asymmetric oxidative coupling copolymerization of 6,6â²-dihydroxy-2,2â²-binaphthalene and dihexyl 6,6â²-dihydroxy-2,2â²-binaphthalene-7,7â²-dicarboxylate with the copper(I)-diamine catalysts under an O2 atmosphere was carried out. The copolymerization using the CuCl-(S)-(â)-2,2â²-isopropylidenebis(4-phenyl-2-oxazoline) catalyst [(S)Phbox], afforded a polymer with the high cross-coupling selectivity of 93%, that is, a copolymer with a mainly alternating structure, in 80% yield. The number-average molecular weight of the methanol-ethylacetate (1/3 v/v)-insoluble part of the copolymer was 1.1Ã104. To estimate the enantioselectivity with respect to the cross-coupling linkage in the obtained copolymer, the model asymmetric oxidative cross-coupling reaction with CuCl-(S)Phbox was also examined, and the products showed a 96% cross-coupling selectivity and enantioselectivity of 43% ee (S).
Journal: Polymer - Volume 47, Issue 6, 8 March 2006, Pages 1845-1851