Disubstituierte Acetylene R-C =C-R (R = CH3, CzH5, C&) bilden bei Temperaturen unter 0" mit Gold(1)-chlorid Komplexe des Typs (R-C =C-R) .AuCI, mit Gold(II1)-chlorid solche des Typs (R--C=C-R),.AU~CI~ (n = 1 oder 2). Der ,,Mischkomplex'6 (DMA)2. AuzC14 wurde mit Hilfe seines 197Au-MoI3bauer-Spektrums als komplexiertesGold (1)-Salz der Tetrachloro-goldsaure [(D MA)2. A d ] +[AuC14]-erkannt. Die bei der Darstellung dieses Komplexes aus iiberschiissigem Dimethylacetylen (DMA) eintretende halftige Reduktion des Gold(IL1)-chlorids zu Gold(1) wird durch DMA bewirkt; dabei entsteht trans-3.4-Dichlor-tetramethyl-cyclobuten. Die neue Formulierung der ,,Mischkomplexe" wird durch die Ubeduhrung von Tolan-AuCl in polan. AuI]+[AuC14]-durch Umsetzung mit Gold(II1)-chlorid bestatigt. Die beim ,,Erwarmen" von DMA . AuCl und (DMA)2 .Au2C14 auftretenden 4 Chlorierungsprodukte des DMA wurden identifiziert.

Gold(ll1)-chlorid tritt mit unterschussigen bzw. aquivalenten Mengen Dimethylacetylen be;tiefen Temperaturen zu roten x-Komplexen (3 bzw. 4) zusammen, die sich in kurzer Zeit spontan in Gold(lI1)-a-Verbindungen (5 bzw. 6 ) mit der Anordnung 2-Chlor-I-methylpropenylgold-dichlorid urnlagern. Diese Gruppe liefert mit weiterem, iiberschiissigen Dimethylacetylen das 3.4-Dichlor-l.2.3.4-tetramethyl-cyclobuten-(l) (2), wobei das a-gebundene Gold zur einwertigen Stufe reduziert wird. Das andere isolierbare Endprodukt dieser Umsetzung ist der schon bekannte x-Komplex Bis(dimethy1acetylen)-gold(1)-tetrachloroaurat (1). x-and a-Complexes from Dimethylacetylene and Gold(III) Chloride as Intermediates for the Formation of 3.4-DichlorotetramethylcyclobuteneAt low temperatures gold(Il1) chloride with deficient or equivalent amounts of dimethylacetylene forms red x-complexes (3 or 4) which, after a short time, spontaneously rearrange to gold(II1) o-compounds (5 or 6), containing the 2-chloro-1-methylpropenylgold dichloride group. With an excess of dimethylacetylene this group reacts to give 3.4-dichloro-l.2.3.4-tetramethyl-1-cyclobutene (2). In the course of this reaction the a-bonded gold is reduced to gold@), which can be isolated as the known x-complex bis(dimethylacetylene)gold(I) tetrachloroaureate (1). HVor kurzem konnten wir uber die Darstellung von Goldkomplexen disubstituierter Acetylene berichten 2). Wahrend Gold( I)-chlorid bei unter 0" in einfacher Addition x-Komplexe des Typs R-CYC-R R = CH3, CzH,, CcH,

Bei der Reaktion vonLBDt man Gold(II1)-chlorid auf iiberschiissiges HMDB in Methylenchlorid bei -78" unter Stickstoff einwirken, so erhalt man nicht den erwarteten HMDB .Au&14-Komplex3), sondern in einer Ausbeute von 40-50 % des eingesetzten Goldsalzes eine gelbe, kristalline Verbindung 1 mit der iiberraschenden Zusammensetzung 1) Diplomarbeit, Univ. Munchen, 1971. 2) Diplomarbeit, Univ. Miinchen, 1970.

Trochanteric femoral fractures are frequently associated with severe osteoporosis in elderly patients. The failure of devices intended to repair trochanteric fractures, such as the gamma locking nail (GLN), might be related to reduced bone density. Osteoporosis may also influence pain and walking ability because of low stability in the fracture area. In 74 patients (mean age 76 ± 16.5 years), the stability and clinical outcome following treatment with GLN were prospectively evaluated and recorded after 9 (n = 43) and 24 months (n = 34). Vertebral bone mineral density (BMD) was measured via quantitative computed tomography (QCT) at time of operation. Mechanical failure of GLN was recorded by radiographs of the hip. Assessment of outcome included the Harris Hip Score. Regression analysis was done to show the influence of age and BMD on clinical outcome. 9 months after treatment, complete fracture healing without dislocation of the lag screw of the GLN was observed even in patients with low BMD (< 55 mg/cm 3 trabecular BMD). Clinical outcome assessed by the Harris Hip Score was independent of BMD at both follow-ups. At the first follow-up, outcome depended on the patient's age, with younger patients (< 70 years) showing better results than elderly patients. The stability of fracture also seemed to influence the outcome.Our results indicate that stabilization of unstable osteoporotic fractures with GLN is associated with few complications and can be accomplished with identical clinical and radiologic results seen in patients with high BMD. The critical factor influencing outcome is patient's age, stability of fracture and not BMD.

Hospital mortality after hip fracture in elderly patients has decreased significantly in previous years. However, patients often show reduction of daily life activity. The aim of the following study was to assess clinical and radiological results nine months after operation of hip fracture. A total of 127 patients (mean age 77.2 years) were stabilized by arthroplasty because of femoral neck fractures or by gamma locking nail because of trochanteric fractures. Modified Harris-Hip-Score as well as social situation at time of follow-up compared to pretrauma situation were evaluated. Hospital mortality was 3.2 percent. Follow-up could be performed in 78 patients clinically and radiologically by examination in the hospital. At time of follow-up 19.7 percent of patients had already died independent of the operative procedure. Only 65 percent of patients were able to live at home. Modified Harris-Hip-Score at follow-up was decreased significantly by 16 points compared to the situation before the trauma. The reduction of the score was caused mainly by deterioration of hip function and less by femoral or hip pain. In future the main scope after hip fracture must be an improvement of rehabilitation of elderly patients.