Helical Disubstituted Polyacetylenes: Synthesis and Chiroptical Properties of Poly(phenylpropiolate)s
作者:Jacky W. Y. Lam、Yuping Dong、Kevin K. L. Cheuk、Ben Zhong Tang
DOI:10.1021/ma0349433
日期:2003.10.1
cholesteryl (4)], are prepared by esterifications of phenylpropiolic acids with borneol, menthol, and cholesterol. Polymerizations of 1−4 are effected by WCl6−Ph4Sn, giving poly(phenylpropiolate)s P1−P4 with high molecular weights in moderate yields. The structures and properties of the polymers are characterized and evaluated by IR, UV, NMR, CD, TGA, and SEM analyses. All the polymers are stable: neither
由于涉及合成困难,很少制备具有螺旋手性的二取代聚乙炔,我们这里报道了一种用于合成这种聚合物的简便聚合体系。两组手性乙炔,即C 6 H 5 C⋮CCO 2 R * R * = [(1 S)-内]]-(-)-冰片基(1),(1 R,2 S,5 R) -(-)-薄荷基(5),胆固醇基(6)}和C 6 H 5 C⋮CCO 2 C 6 H 4 CO 2 R * [R * =降冰片基(2),薄荷基(3),胆固醇基(4)]是通过苯丙酸与冰片,薄荷醇和胆固醇的酯化反应制得的。的聚合1 - 4由WCL实现6 -Ph 4的Sn,得到的聚(苯基丙)性s P 1 -P 4具有高分子量,产率中等。通过IR,UV,NMR,CD,TGA和SEM分析来表征和评估聚合物的结构和性质。所有聚合物都是稳定的:在将聚合物储存在架子上约3年后,分子量均未降低,光谱也未发现变化,并且将聚合物加热至300°C时,未发现重量损失。尽管