A synthesis for dihydrofarnesene, H⋅[CH2⋅CMe:CH⋅CH2]3⋅H⁠, has been devised which appears to be capable of utilization in the formation of other low-molecular dihydropolyisoprenes, H⋅[CH2⋅CMe:CH⋅CH2]n⋅H⁠, in which the individual isoprene units are uniformly arranged in head-to-tail fashion. This synthesis, starting from geraniol, gives a triene hydrocarbon which differs in one of its additive properties from a product described as dihydrofarnesene in the literature. The reason for the difference has been investigated. A new synthesis for squalene has been devised which appears to be capable of utilization in the formation of other symmetrical dihydropolyisoprenes, H⋅[CH2⋅CMe:CH⋅CH2]n⋅[CH2⋅CH:CMe⋅CH2]n⋅H⁠, of the squalene type. This starts from geranylacetone and the Grignard derivative from 1,4-dibromobutane.

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