Cyclization of synthetic cis‐1,4‐polyisoprene was carried out by using TiCl4 and p‐toluenesulfonic acid catalyst. The average cyclicity and structure of the polymers cyclized to a different degree was studied by infrared and high‐temperature NMR spectroscopy. The methods of synthesizing an average mono‐, bi‐, tri‐, or polycyclic polymer that could be distinguished by high‐temperature NMR spectroscopy and followed by gel‐permeation chromatography are discussed.
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Agnihotri et al. (1972) studied this question.
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