Abstract
Protonation of sodium 1,2-diphospha-3,4,5-triphenylcyclopentadienide occurs with a [1,5]-proton shift and leads to rac-trans-1,2,6,7-tetraphosphatricyclo[5.3.0.02,6]-3,9-decadiene, the product of an unusual [2 + 2] cycloaddition reaction
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