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4589phosphorus bond distance in 1 is much shorter than the reported average values in ( C 6~5 P ) 5 [2.217 (6) All6 and (C6H5P)6 [2.237(3) All7 in spite of the strong steric hindrance in 1, indicating that the bond in the diphosphene has considerably double bond character. All intermolecular approaches correspond to the van der Waals interactions. Reaction of 1 in carbon tetrachloride with chlorine gas at room temperature gave (2,4,6-tri-tert-butylphenyl)phosphonic dichloride almost quantitatively after treatment with water. The same result was obtained in the presence of methanol.The compound 1 is the first isolated phosphobenzene with a localized P==P bond in contrast to [ (trifluoromethy1)phosphinidene] tributylpho~phorane'~ with a delocalized P=P bond.Compound 1 may serve as a good model for theoretical studies as well as studies in organic and inorganic chemistry. Further investigation of the chemical properties and reactions of 1 is now in progress.

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