Gudeangadi Prashant G, Sakamoto Takeshi, Shichibu Yukatsu, Konishi Katsuaki, Nakano Tamaki
Catalysis Research Center (CRC) and Graduate School of Chemical Sciences and Engineering, Hokkaido University, N21, W10, Kita-ku, Sapporo 001-0021, Japan.
Faculty of Environmental Earth Sciences, Hokkaido University, N10, W5, Kita-ku, Sapporo 060-0810, Japan.
ACS Macro Lett. 2015 Sep 15;4(9):901-906. doi: 10.1021/acsmacrolett.5b00477. Epub 2015 Aug 12.
()-1,1'-Bi(2-naphthol) was reacted with 1,4-phenylene diisocyanate leading to a mixture of linear polyurethane and cyclic compounds including a cyclic dimer and a cyclic trimer. The structure of the cyclic dimer was elucidated by X-ray crystal structure analysis. The polymer was proposed to possess a rather stiff, π-stacked, 2/1-helical conformation on the basis of NMR, CD, and UV spectra and molecular dynamics simulations. The conformation was stable in the range of temperature of 0-60 °C.
（-）-1,1'-联（2-萘酚）与1,4-亚苯基二异氰酸酯反应，生成线性聚氨酯和环状化合物的混合物，其中包括环状二聚体和环状三聚体。通过X射线晶体结构分析阐明了环状二聚体的结构。基于核磁共振、圆二色光谱和紫外光谱以及分子动力学模拟，推测该聚合物具有相当刚性的、π堆积的2/1-螺旋构象。该构象在0-60°C的温度范围内稳定。
