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Abstract
Including recent examples the phosphorus-31 chemical shift range of (E)-diphosphenes extends from δ = 192 to 816. For a given substituent at PA the chemical shift δA decreases when the substituent at PB changes from electron accepting to electron donating. The smallest δA values (and also the smallest coupling constants 1JAB) are found for diphosphenes with an ylide substituent at PB, the largest δA value is found for a disilyl diphosphene.