Abstract
The incorporation of the first monomer unit in a growing chain of isotactic polypropylene affords an asymmetric carbon atom, and the orientation of subsequent monomer units has been explained on the basis of asymmetric induction. This hypothesis has now been tested by carrying out the polymerization of propylene in the presence of an optically active trialkylaluminium and α-titanium trichloride. The absence of optical activity in the resulting polymer, and in the products of its pyrolysis, would appear to disprove the above hypothesis. Polymerizations carried out in an optically active medium also failed to produce an optically active polypropylene.
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