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Diphospha[4]radialene 1 is planar and highly symmetrical in the crystal, and accessible from the corresponding 1,2-dibenzyl-substituted cyclobutene by bromination and debromination. The UV/VIS spectra of 1 indicate an extended π-electron system. Ar = 2,4,6-tBu3C6H2.
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Toyota et al. (1993) studied this question.
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