1. Synthesis and x-ray crystal structure of the first transition-metal cluster involving framework phosphorus-phosphorus double bonds
2. Ein Diphosphen als Tetrahedran-Baustein: Synthese von [Fe2(CO)6(P2tBu2)]
3. Selected physical data: 2a: m.p. = 166°C, ?(P) = 500.9, 412.3 (AB, 1J(PP) = 517.6 Hz), UV (cyclohexane): ?max = 460 nm; 3a: 136°C, ? = 393.9, 384.9 (603.0 Hz), 473 nm; 2b: 163°C, ? = 486.3, 395.0 ppm (518.8 Hz), 435 nm; 3b: 123°C, ? = 398.4, 359.0 (585.9 Hz), 456 nm; 2c: 177°C, ? = 461.9, 352.4 (528.8 Hz), 436 nm; 3c: 128°C, ? = 393.1, 322.4 (576.8 Hz), 459 nm. Note added in proof (March 22, 1985): We have meanwhile found a new synthesis of 2: Chem. Lett., in press.
4. Synthesis and structure of bis(2,4,6-tri-tert-butylphenyl)diphosphene: isolation of a true phosphobenzene