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The synthesis and characterization of N,N'-dimesityl-4,6-diketo-5,5-dimethylpyrimidin-2-ylidene is reported; this crystalline N,N'-diamidocarbene was found to split ammonia and engage in other reactions not exhibited by typical N-heterocyclic carbenes.
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Hudnall et al. (2010) studied this question.
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