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High-Yield Syntheses of Sterically Demanding Bis(N-heterocyclic carbene) Complexes of Palladium,

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journal contribution
posted on 13.09.1999, 00:00 by Wolfgang A. Herrmann, Jürgen Schwarz, Michael G. Gardiner
The synthesis of bis(N-heterocyclic carbene) chelates of formula (E = spacer linkage; R = alkyl, aryl; X = halide) is presented via improved high-yielding, air-stable procedures (for E = CH2). A detailed study of the intermediates involved in the preparation of (X = Br, I) provide evidence for the difficulty in extending our synthetic procedures to include chelates of different ring sizes and also in preparing the analogous nickel complexes.