title: Synthesis ofCis,syndiotacticA-alt-B Copolymers from Two Enantiomerically PureTrans-2,3-Disubstituted-5,6-Norbornenes.
abstract: Cis,syndiotacticA-alt-Bcopolymers, whereAandBare two enantiomerically puretrans-2,3-disubstituted-5,6-norbornenes with "opposite" chiralities, can be prepared with stereogenic-at-metal initiators of the type M(NR)(CHR')(OR")(pyrrolide). Formation of a high percentage of alternatingABcopolymer linkages relies on an inversion of chirality at the metal with each propagating step and a relatively fast formation of anABsequence as a consequence of a preferred diastereomeric relationship between the chirality at the metal and the chirality of the monomer. This approach to formation of an alternatingABcopolymer contrasts dramatically with the principle of formingABcopolymers from achiral monomers and catalysts.
authors.affiliation: Department of Chemistry 6-331, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Eun Sil
authors.initials: ES
authors.lastname: Jang
authors.affiliation: Department of Chemistry 6-331, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: John
authors.affiliation: Department of Chemistry 6-331, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Richard R
authors.initials: RR
authors.lastname: Schrock