Rubber Chemistry and Technology · 1983 · 37 citations · 0 references
Abstract The chemical structure of naturally occurring cis -polyisoprene isolated from Solidago altissima was determined by 13 C 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.