Propiolic acid was directly polymerized in water with water-soluble rhodium complexes in the presence of bases such as NaOH to yield the cis − transoidal poly(propiolic acid) sodium salt (poly- 1 −Na) in high yields. Moreover, poly- 1 −Na exhibited an induced circular dichroism (ICD) in the UV−visible region in water due to the formation of a predominantly one-handed helical structure responding to the chirality of the optically active amino alcohols. The stereoregularity of the polymer decreased when the poly- 1 −Na was converted into the acid form, poly(propiolic acid). However, poly(propiolic acid) also showed ICDs in the UV−visible region in water in the presence of optically active amino alcohols.
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Maeda et al. (2001) studied this question.
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