The chemical structure of naturally occurring cis-polyisoprene isolated from Solidago altissima was determined by 13C NMR spectroscopy. The alignment of the isoprene units in the polymer was estimated to be in the order: dimethylallyl terminal unit, three trans units, about 1000 to 2200 of internal cis units, and a cis allyl alcohol terminal unit. This demonstrates that the biosynthesis of cis-polyisoprene in this higher plant starts from trans,trans,trans-geranylgeranyl pyrophosphate.
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Tanaka et al. (1983) studied this question.
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