Dinuclear site Epoxides

The authors postulated that on these materials complete site isolation is not mandatory in order to have active and selective titania-silica epoxidation catalysts . The 100% selectivity of the dinuclear, silica-supported... 

Titanium alkoxides are effective homogeneous catalysts for the epoxidation of substituted olefins. Their propensity for association to multinuclear species is also well-established (6). The active form of a homogeneous, enantioselective titanium-tartrate catalyst was demonstrated to be dinuclear in titanium (7). In contrast, heterogeneous catalysts consisting of titanium embedded in an aluminosilicate framework contain mostly isolated titanium sites (8), although the assertion that such sites are uniquely responsible for catalyst activity is based on... 

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