Pentacarbonyl(tellurobenzaldehyd)wolfram: Erzeugung, Thermolyse und Reaktionen mit konjugierten Dienen

Article abstract of DOI:10.1016/0022-328X(91)80121-Y

Benzylidene(pentacarbonyl)tungsten reacts with tellurocyanate, ^-, by insertion of the telurium atominto the benzylidene-tungsten bond to give pentacarbonyl(tellutobenzaldehyde)tungsten (3).The complex 3 is thermally very labile.When thermolyzed the binuclear tellurobenzaldehyde-bridged complex <(CO)5W>2<μ₂-η¹,η²-Te=C(Ph)H> (4) is formed.The reaction of 3 with 2,3-dimethyl-1,3 butadiene affords (7).In solution, tow isomers of 7 are detectable, the phenyl group ocuupying the equatorial position in both.The <4+2>-cycloaddition of cyclopentadiene to 3 is stereoselective.Two isomers, exo-8 and endo-8 (Ph endo and (CO)5W exo>, are formed in the ratio 11/1.The structure of the main isomer exo-8 is confirmed by an X-ray analysis.