aluminium trichloride in neat (no solvent) byproducts: (CH3)3SiCl, (CH3)3SiCCH; allowing mixture of educts and AlCl3 to stand overnight (thick-walled ampoule, inserted into a steel pipe), heating at 100°C for 6h (vac.), pyrolysis at 800-1200°C (vac. or Ar); EEL-spectroscopy, X-ray diffraction;