Inside Back Cover: Well‐Defined Single‐Site Monohydride Silica‐Supported Zirconium from Azazirconacyclopropane (Chem. Eur. J. 11/2015)

Abstract

Monohydride silica‐supported zirconium The silica‐supported azazirconacyclopropane SiOZr(HNMe2)(η2‐NMeCH2)(NMe2) (1) leads exclusively under hydrogenolysis conditions (H2, 150 °C) to the single‐site monopodal monohydride silica‐supported zirconium species SiOZr(HNMe2)(NMe2)2H (2). Reactivity studies by allowing compound 2 to come into contact with ethylene, hydrogen/ethylene, propene, or hydrogen/propene, at a temperature of 200 °C revealed alkene hydrogenation. For more details, see the Full Paper by Jean‐Marie Basset et al. on

Evidence for Silica Surface Three- and Five-Membered Metallacycle Intermediates in the Catalytic Cycle of Hydroaminoalkylation of Olefins Using Single-Ti-Metal Catalysts

“…Therefore, in the present study, we have explored the possibility of grafting the homoleptic tetrakis­(dimethylamido) complexes [Ti­(NMe 2 ) 4 ] on highly dehydroxylated silica (SiO 2‑700 ), with the intent of drawing a full image of what was done previously in our group with the homoleptic zirconuim complex. − The objective was to isolate, using SOMC concepts and tools, − all or some of the elementary steps of the catalytic cycle of heterogeneous hydroaminoalkylation previously proposed in homogeneous catalysis. − …”