Volume 100, Number 4 April 2000
Frontiers in Metal-Catalyzed Polymerization: Designer Metallocenes, Designs
on New Monomers, Demystifying MAO, Metathesis De´shabille´
This thematic issue of Chemical Reviews does not systems are delineated and contrasted. Coates sub-
come with the customary Guest Editor, normally a sequently analyzes plex factors controlling
prominent researcher in the field. Rather, it is edited stereochemistry in polymers derived from R-olefins,
by an informed spectator, one of the regular Editorial conjugated and nonconjugated dienes, cycloalkenes,
staff. This might be viewed as a less auspicious and other monomers. This theme is further developed
strategy. However, the expertise of the authors is by Resconi, Cavello, Fait, and Piemontesi, who dis-
widely known, and their outstanding collection of sect the intricate nuances of mechanism and selectiv-
articles speaks for itself. The subject is so topical and ity underlying propylene polymerization, from cata-
important, both in academic and industrial contexts, lyst symmetry to ic models.
that little introduction is actually needed. In a tour-de-force with respect to the arcane patent
The modern era of metal-catalyzed polymerization literature, Hlatky reviews heterogeneous single-site
begins of course with Ziegler and Natta. However, catalysts. This plemented by an article by Fink,
over the last 15 yearssthe approximate time frame Steinmetz, Zechlin, Przybyla, and Tesche on the
of the advances reviewed hereinsthe field has evolved specific subject of propylene polymerization with
in ways that these founding fathers could never have silica-supported metallocene/MAO catalysts. The
dreamed of. These developments elegantly illustrate mechanistic role of MAO and other activators is then
the synergies possible between pure and applied analyzed by Chen and Marks. They define structure-
research. The latest improvements in analytical activity relationships that are certain to promot
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