title: Batchwise and continuous organophilic nanofiltration of Grubbs-type olefin metathesis catalysts.
abstract: A mass-tagged N-mesityl imidazolinium salt with four additional -CH(2)NCy(2) substituents was synthesized, leading to a molecular mass of nearly 1100 g mol(-1) in the corresponding carbene ligand. This mass-tagged ligand was used to generate the respective Grubbs II and Grubbs-Hoveyda type complexes. The catalytic activity of the latter complex was tested in several olefin metathesis reactions and found to be slightly superior to that of the related N-mesityl based complex. In batchwise solvent resistant nanofiltration experiments the ruthenium complex dissolved in toluene and following a metathesis reactions was efficiently retained (>99.8 %) by a single nanofiltration; the permeate contained less than 4 ppm of Ru. Equally efficient catalyst retention was observed in a membrane reactor utilized for the continuous synthesis of a RCM product.
authors.affiliation: Anorganische Chemie im Zintl-Institut, Petersenstr. 18, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Schoeps
authors.forename: Kristian
authors.initials: K
authors.lastname: Buhr
authors.forename: Marga
authors.initials: M
authors.lastname: Dijkstra
authors.forename: Katrin
authors.initials: K
authors.lastname: Ebert
authors.forename: Herbert
authors.initials: H
authors.lastname: Plenio