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A nonstandard method of carbene generation is provided by reaction of 1 with AgBF4 to give the transient metalladiphosphanylcarbene 2. This unique dicationic singlet carbene can be trapped with bases (pyridine (Py) for example, see scheme) showing its electrophilic character, which is also confirmed by DFT calculations.
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Ruiz et al. (2003) studied this question.
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