Ei‐ichi Negishi1, Thinh Nguyen1, John Paul Maye1, Daniele Choueiri1, Noriyuki Suzuki2, Tamotsu Takahashi2
1Department of Chemistry, Purdue University
2Coordination Chemistry Laboratories, Institute for Molecular Science
Tóm tắt
Abstract
Competitive β-hydrogen abstraction of “mixed” dialkylzirconocenes and kinetic measurements of decomposition of methyl(alkyl)zirconocenes reveal unexpected relative reactivity of alkyl groups as β-hydrogen donors, such as s-Bu > t-Bu ≥ Et > n-Bu > i-Bu, which correlate well in most cases with the reactivity order of: β-methyl > β-methylene > β-methine. Some mechanistically crucial features of the reaction are also discussed.
