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The N-heterocyclic olefin, IPr=CH(2) (IPr = (HCNDipp)(2)C, Dipp = 2,6-(i)Pr(2)C(6)H(3)) has been demonstrated to be of sufficient Lewis basicity to stabilize main group hydrides in unusually low oxidation states.
Al-Rafia et al. (Sat,) studied this question.
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