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The FLP-mesityl azide addition products 5, formed by FLP-addition to the terminal azide nitrogen atom, undergo N-N bond cleavage in an unusual variant of the Staudinger reaction upon thermolysis or photolysis to give an internally borane stabilized [P]=NH phosphinimine and a dimethylindazole derivative.
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Stute et al. (2012) studied this question.
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