Myrcene has been polymerized by treatment with triisobutylaluminum and titanium tetrachloride, triisobutylaluminum and vanadium trichloride, and by free radical initiation in emulsion systems. The polymers thus obtained vary in molecular weight range but all have a predominantly 1,4‐arrangement of the diene unit in the polymer chain. It is not possible to say whether this is a cis or trans structure on the basis of present information. Different samples of the polymyrcene obtained by the action of triioso‐butylaluminum and vanadium trichloride have inherent viscosities of 2 to 5.5. Myrcene polymerized by boron trifluoride etherate appears to have a cyclic recurring unit and is probably identical in structure with polymers prepared from β‐pinene by cationic initiation.
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Marvel et al. (1960) studied this question.
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