| abstract |
The present invention relates to an isoprene oligomer having a trans structure and a cis structure represented by the following formula (1), wherein at least one of the atoms or atomic groups contained in the trans structure is replaced by another atom or atomic group substitution. Furthermore, it also relates to polyisoprene biosynthesized from the isoprene oligomer and prenyl diphosphate. Also provided are rubber compositions comprising the isoprene oligomer and/or the polyisoprene, and applications of the rubber composition to various parts of tires (for example, treads, sidewalls). Pneumatic tires. [chemical 1] In formula (1), n represents the integer of 1-10. m represents the integer of 1-30. Y represents a hydroxyl group, a formyl group, a carboxyl group, an ester group, a carbonyl group, or a group represented by the following formula (2). [Chem 2] |