Chemistry

Bipartisan Catalyst

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Science  05 Jan 2001:
Vol. 291, Issue 5501, pp. 15
DOI: 10.1126/science.291.5501.15c

Polymers can be made in which two different kinds of chains (for example, one hydrophobic and the other hydrophilic) are linked together; this can produce effects such as nanophase separation. Usually, the chemistries needed to make different kinds of chains require that the polymerization reactions be performed sequentially. Bielawski et al. now report on a ruthenium catalyst that can perform both the ring-opening metathesis polymerization (ROMP) of 1,5-cyclooctadiene and the atom-transfer radical polymerization of methacrylate. They combined a ROMP catalyst and allyl-2-bromo-2-methylpropionate to prepare a catalyst that can perform both polymerizations at once, thus growing the two kinds of chains outward from the middle. — PDS

J. Am. Chem. Soc.122, 12872 (2000).

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