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Abstract
We report on the first phosphorus 1,1-σ-complexes, relatively stable in DMSO. Adducts of this type are important as possible intermediates in nucleophilic aromatic substitution reactions but for phosphorus nucleophiles 1,1-σ-complexes were never detected [1]. We have found that interaction of 1 with 2 in DMSO leads initially to 1,3-σ-complexes 3 which slowly rearrange to 1,1-σ-complexes 4.