Synthese und Reaktionen von (CO)5Mo

Article abstract of DOI:10.1016/0022-328X(90)85006-K

The pentacarbonyl(α-ethoxybenzyl)molybdates NEt4<(CO)5Mo> react with HBF4 .Et2O by abstraction of the ethoxy group to give the benzylidene complexes (CO)5Mo (R = Me (2a), OMe (2b)).The compounds 2 are thermally very labile and react rapidly even at -100 deg C with a number of nucleophiles.The addition of PPh3 to the benzylidene carbon atom of 2a gives the ylide complex (CO)5Mo and that of PPh2Cl gives the phosphine complex (CO)5MoPPh2 under rearrangement.The reaction of 2b with PPhCl2 stereoselecti vely gives RS/SR-(CO)5Mo> and with ^- (X = S, Se) gives the heterobenzaldehyde complexes (CO)5Mo (X = S (6b), Se (7b)).The thioacrylamide complex (CO)5Mo is obtained from the reaction of 6b with MeC<*>CNEt2.The <4 + 2>-cycloaddition of 7b with cyclopentadiene gives a (CO)5Mo-coordinated selenanorbornene derivative.Cyclopropanation is observed in the reaction of 2b with cyclopentadiene.The resulting bicyclo<3.1.0>hexene which is coordinated to (CO)5Mo via the C=C bond can be cleaved off the metal by air.