Inside Cover, Volume 50, Issue 13


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The cover image illustrates the isotactic enchainment of propylene by a highly stereospecific class of octahedral chiral group 4 bisphenolate ether complexes, as presented by Sören Randoll, Elizabeth T. Kiesewetter, and Robert M. Waymouth on page 2604. Catalysts derived from these complexes are highly stereo- and regioselective for propylene polymerization, affording isotactic polypropylene with melting points as high as 165 °C. Occasional regioerrors occur, as illustrated by a bound propylene poised to undergo a 2,1-secondary insertion.