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.

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The reaction of trialkylboranes with wtosyloxy-l-lithio-1-alkynes can induce transfer of a n alkyl group froiii the boron atom to the alkynyl carbon atom with concomitant formation of four-through

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