Hongzhi Tang, H. Miura, Ichiro Imae
Nov 1, 1999
Citations
0
Influential Citations
2
Citations
Journal
Polymer Journal
Abstract
Optically active (R)-spiro[3.3]heptane-2,6-dicarboxylic acid was obtained by optical resolution with brucine. Its optical purity was confirmed by HPLC analysis on optically active stationary phase. The specific optical rotations of model compounds having one and two spiran units increased with increasing the number of spiran unit in sulfuric acid solution. On the contrary, the specific optical rotations showed opposite sign in organic solvents, such as N,N-dimethylformamide and N,N-dimethylacetamide, and the absolute values decreased with increasing the number of spiran unit. Polycondensation of (R)-spiro[3.3]heptane-2,6-dicarboxylic acid chloride and 3,3′-dimethoxybenzidine gave a polymer soluble in common organic polar solvents. This polymer showed a large positive Cotton effect.