67946-07-0Relevant articles and documents
Stereoselective synthesis and reactivity of dienyl zirconocene derivatives
Chinkov, Nicka,Majumdar, Swapan,Marek, Ilan
, p. 2411 - 2417 (2004)
Stereoselective dienyl zirconocene derivatives have been prepared via a tandem allylic C-H bond activation isomerization-elimination reaction. These reagents can be either trapped directly with electrophiles or transmetalated to copper to participate in s
Stereoselective Preparation of Dienyl Zirconocene Complexes via a Tandem Allylic C-H Bond Activation-Elimination Sequence
Chinkov, Nicka,Majumdar, Swapan,Marek, Ilan
, p. 13258 - 13264 (2007/10/03)
Several dienyl zirconocene derivatives were easily prepared, as unique geometrical isomers, from simple non-conjugated unsaturated enol ethers with (1-butene)ZrCp2 complexes. This new methodology is based on a tandem allylic C-H bond activation-elimination sequence and the mechanism has been mapped out by deuterium labeling experiments. The stereochemical outcome of this process was determined by addition of several electrophiles. Moreover, when the organometallic derivative is vinylic as well as allylic such as in 44-47Zr, an unexpected reversal of the stereochemistry has been found during the zirconium to copper transmetalation step.