Synthesis of C 1- and C 3ν-symmetric porphyrin trimers based on triphenylmethane cores

This work describes the synthesis of a new class of tripodaphyrin derivatives with a triphenylmethane core. Both C₁- and C3ν-symmetric tetrahedral large molecules with covalently linked rigid elements were obtained

Über die direkte Photolyse von Cyclohexan in der Gasphase

The photolysis of cyclohexane at 1.0. 0.5, and 0.2 mm pressure and room temperature with an unfiltered hydrogen lamp led to hydrogen, acetylene, ethylene, propene. 1.3-butadiene and cyclohexene as the major products, and other minor products. A consideration of the stoichiometry, the effect of increasing pressure, the dependence on time, and the energetic requirements, suggest that only four processes are important which may arise from an excited state of the cyclohexane molecule. These are (1) (C6H12)*→C6H10 + H2; (2) (C6H12)*→-C4H6 + C2H4 + H2; (3) (C6H12)*2 C3He6: (4) (C0H11)*→3 C2H4. The formation of acetylene is considered to be a secondary process.</jats:p