1361241-55-5Relevant academic research and scientific papers
Molybdenum monoaryloxide pyrrolide alkylidene complexes that contain mono-ortho-substituted phenyl imido ligands
Lichtscheidl, Alejandro G.,Ng, Victor W. L.,Mueller, Peter,Takase, Michael K.,Schrock, Richard R.
, p. 2388 - 2394 (2012/06/04)
Monaryloxide pyrrolide (MAP) molybdenum imido alkylidene complexes of the type Mo(NArX)(CHCMe2R)(Me2Pyr)(OR′) (Me2Pyr = 2,5-dimethylpyrrolide) have been prepared in which NAr X is an ortho-substituted phenylimido group (X = Cl (NAr Cl), CF3 (NArCF3), i-Pr (NAriPr), t-Bu (NArtBu), mesityl (NArM), or TRIP (TRIP = triisopropylphenyl; NArT)) and OR′ = O-2,3,5,6-(C 6H5)4C6H (OTPP), O-2,6-(2,4,6-Me3C6H2)2C 6H3 (OHMT), or O-2,6-(2,4,6-i-Pr3C 6H2)2C6H3 (OHIPT). The object was to explore to what extent relatively "large" NAr M or NArT ligands would alter the performance of MAP catalysts in reactions that have been proposed to depend upon the relative size of the imido and OR′ groups. Preliminary studies employing the ring-opening metathesis polymerization of 5,6-dicarbomethoxynorbornadiene as a measure of selectivity suggest that a single phenylimido ortho substituent, even in an NArM or NArT group, does not produce any unique behavior and that the outcome of the ROMP reaction correlates with the overall relative size of the imido and OR′ group. Single-crystal X-ray structures of six species that contain the new NArM or NArT groups are reported.
