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An abnormal aza-Wittig reaction was observed when resin-bound iminophosporanes were treated with aryl isocyanates on the solid-phase. The mechanism of the reaction may involve the loss of triphenylphosphinimide instead of triphenylphosphinoxide, resulting in the formation of isocyanates instead of carbodiimides as intermediates. The selectivity of the abnormal aza-Wittig reaction versus the normal...
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