Cyclic and high molecular weight chiral binaphthoxy-phosphazene polymers carrying Br or trimethylsilyl-acetylene groups期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Cyclic and high molecular weight chiral binaphthoxy-phosphazene polymers carrying Br or trimethylsilyl-acetylene groups

Authors:	Gabino A. Carriedo^{,Francisco J. Garcí} a Alonso,José L. Garcí a Á lvarez,Alejandro Presa Soto

Affiliation:	Departamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, Oviedo 33071, Spain

Abstract:	The new chiral and functionalized cyclic binaphthoxyphosphazenes R,R,R-[N₃P₃(O₂C₂₀H₁₀Br₂)₃] (R-1), R,R,R-[N₃P₃(O₂C₂₀H₁₀(CCSiMe₃)₂)₃] (R-2), and the high molecular weight linear polymers R/S-[NP(O₂C₂₀H₁₀Br₂)]_n (R/S-3), R-[NP(O₂C₂₀H₁₀Br₂)]_n (R-3), and R-{NP[O₂C₂₀H₁₀(CCSiMe₃)₂]}_n, (R-4), with M_w on the order of 10⁶ and very high T_g, have been synthesized and characterized by IR and NMR spectroscopy. The optically active polymer (R-3) was configurationally stable below 300 °C, but at higher temperatures an atropisomerization process took place that became faster near the glass transition temperature (ca. 350 °C).

Keywords:	Chiral phosphazenes Binaphthoxyphosphazenes Cyclophosphazenes
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