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Transition-metal-free hydrogenation of alkenes can be carried out with simple organocalcium catalysts (20 bar H2, 20 °C). Both steps in the proposed catalytic cycle, hydride addition to the double bond and σ-bond metathesis with H2, have been confirmed. Alkenes sensitive to polymerization are also hydrogenated in good yields.
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Spielmann et al. (2008) studied this question.
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