PINENE, HEPTANE, 6.6-DIMETHYL-2-METHYLENE

Synonym P-Pinene d, or nopinene p-Pinene l, or 2(10)-pinene Chemical Name 6,6-dimethyl-2-methylene bicyclo[3,l,l]heptane CAS Registry No 19172-67-3... 

Nopinene j3-Pinene Terebenthene 6,6-Dimethyl- 2-methylene bicyclo [2 3.1.1 heptane 2(10)-Pinene... 

Bornane monoterpenes are exemplified by camphene (2,2-dimethyl-3-methylene-bicyclo[2,2,1]heptane), a structure in which two fused cyclopentane rings share three Cs. We can simply represent the camphene skeleton as a cyclohexane with a methylene (—CH2—) cross-link (G6(-CH2—)). The keto derivative camphor (camphor smell), the ether eucalyptol (eucalyptus smell) and the simple bornene a-pinene (pine smell) are familiar examples. 

Synonyms 6,6-Dimethyl-2-methylenebicyclo [3.1.1] heptane 6,6-Dimethyl-2-methylene [3.1.1.] heptane Nopinen Nopinene 2(10)-Pinene... 

Next to isobutene, other 1,1-dialkyl substituted ethenes can also be polymerized cationically. Suitable monomers are 2-methyl-1-butene, 2-methyl-1-pentene, and 2,3-dimethyl-1-butene [613] Polymers with very high molecular weights of Mn>300000 are obtained by catalysis with aluminum alkyl halogenides. Also, cyclic hydrocarbons with a methylene group (methylenecyclopropane, methylene cyclobutane, methylene cyclohexane, a-pinene) are suitable monomers [614-619]. 1,1-Disubstituted ethenes with stronger steric hindrance as camphene or 2-methylene-bicyclo-[2.2.1] heptane, however, could not be polymerized cationically [574]. 

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