Synthesis and Reactions of the Carbene Complexes L> (M = Mo or W; L = η-C5H5, η-C5Me5 or indenyl), (η-C5H5)> (M = Mo or W) and (η-C5H5) (M = Mo or W, R = Me or Ph). X-Ray Crystal Structures of
Treatments of the tricarbonyls with LiPh followed by results in the formation of the carbenes L> in good to high yields.Related reactions of but using LiMe afford (η-C5H5)>.The complex trans-(η-C5Me5)> is monoclinic, a=14.611(36), b=16.788(20), c=16.183(30) Angstroem, β=96.08(18) deg, and R=0.0888 for 2117 independent reflections.While the η-C5H5 and indenyl complexes exist as pairs of isomers in solution generated by rotation apout the M=Ccarbene bond, the η-C5Me5 complexes exist as single isomers in solution.Treatment of (η-C5H5)> (M = Mo or W) with I2 results in formation of the iodometalspecies (η-C5H5)>.The complex (η-C5H5)> is monoclinic, a=9.34(3), b=13.00(2), c=13.53(3) Angstroem, β= 97.8(2) deg, and R=0.0812 for 2091 independent reflections.In solution this compound exists as three trans isomers and one cis.Treatment of (η-C5Me5)> with I2 results in the eventual formation of in the molybdenum case and in both cases.
Adams, Harry,Bailey, Neil A.,Bentley, Gary W.,Hough, Gordon,Winter, Mark J.,Woodward, Simon