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ABSTRACT:2-

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Application of 1,2-Bis(2-bromo-3,5-di-t-butylphenyl)ethane to the Preparation of Compounds Having Two Diphosphene Units.-Reaction of the dibromide (I) with phenyllithium gives the homo-coupling product (II), which on lithiation with BuLi followed by addition of PCl3 affords the bis-dichlorophosphino compound (III). Final coupling of (III) with an arylphosphine (IV) leads to the E,E-diphosphene (V). -(YOSHIFUJI, M.; SHINOHARA, N.; TOYOTA, K.; Tetrahedron Lett. 37 (1996) 43, 7815-7818;