130495-60-2Relevant academic research and scientific papers
Synthesis, Characterization, and Some Reactions of Tricarbonyl(cyclobutabenzene)chromium(0) Derivatives
Wey, Hans G.,Betz, Peter,Butenschoen, Holger
, p. 465 - 474 (2007/10/02)
The tricarbonyl(cyclobutabenzene)chromium(0) complexes 12-20, have been prepared from the free ligand and triammin-tricarbonylchromium(0) or hexacarbonylchromium(0).The complexes have been characterized by spectroscopic methods (IR, 1H NMR, 13C NMR) and mass spectrometry, and 1H-NMR signal assignments have been verified by an NOE experiment.Diastereomeric ratios have been determined by 1H NMR and the diasteromers of the 1-methyl derivative 16 separated by HPLC.A crystal-structure analysis is presented for exo-16.A photochemical ligand exchange takes place in 70percent yield for the 1-trimethylsilyl derivative 19.Metalation with n-butyllithium/tmeda at -78 deg C has been observed only for aromatic and not for the benzylic protons.
