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A pentacoordinated intermediate has been proposed to explain the β-H elimination in [PdEt2(PR3)2] to give ethane and ethene, where the addition of phosphine has little effect on the reaction rate:
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Other less-common mechanisms have been reported for β-H elimination in palladium allyls, such as direct deprotonation of a β-H in the presence of a base (see for example:
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