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Na condensation of CH3SiHCI2 gives polysilanes of the type ((CH,SiH),(CH3Si),), (wherex + y = 1) whose pyrolysis in a stream of Ar gives Sic and a substantial amount of elemental Si. Treatment of such polysilanes with catalytic quantities of group-IV-metal-organometallic complexes, ((11-C 5H j)2 ZrH2),I, Ti(CH3)r, results in cross-linking processes such that pyrolysis of these polysilanes gives close to stoichiometric SIC (295 wt %) and only very little elemental Si. [

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Hallux rigidus is a common problem of the first metatarsophalangeal joint and is particularly common in the 31-69 year old age group. Loss of articular cartilage narrowing of joint space and formation of periarticular osteophytes are present and increase over time, often leading to palpable osteophyte formation. The authors suggest that a diagnosis of hallux rigidus be made if at least 4 of the following are present at the big toe: pain, stiffness, palpable exostosis, positive X-ray findings, positive axial grind test, occasional synovitis, decreased motion on motion palpation (particularly dorsiflexion). This case study follows a 36-year-old male professional tennis player over a 7 year period under various forms of management including orthopaedic, physical therapy and chiropractic care. Initial surgery provided some relief, subsequent physiotherapy did not significantly reduce the patient's pain while chiropractic manipulation and mobilization on two separate occasions provided marked reduction in pain scores. NSAID usage and "punching out" his shoes also provided some relief. There is a reasonable possibility that general foot and big toe mobilization and the Brantingham "protective" big toe manipulation may reduce the pain of hallux rigidus. A randomized-controlled study should be done to ascertain the efficacy of such a treatment protocol.

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Die Reaktion des FeRu‐Clusters (I) mit einer Reihe von tert. Phosphinen und Phosphiten L führt zu den Mono‐ und Disubstitutionsprodukten (II).

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