phenyl)phosphinous Chloride (2b), and 1,6-Diphosphatriptycene (10). A mixture of 68.2 g (2.2 g-atoms) of elemental phosphorus, 588 g (4 mol) of o -dichlorobenzene, 7 g (0.043 mol) of anhydrous ferric chloride, and 1.3 g (0.0068 mol) of titanium tetrachloride was heated for 4 hr at 325°C (see general remarks) in a sealed tube. After cooling the reaction product was filtered through a coarse fritted glass filter funnel. The crystalline 1,6-diphosphatriptycene (10, 45 g) was washed with methanol and recrystallized from tetrachloroethylene. It melted at 313-315°C; ir spectrum (KBr) bands at 3050,

In den drei Arbeiten wird die Hydrierung von Alkenen und Alkadienen auf katalytischem Wege oder mit Diimid insbesondere unter Berücksichtigung der sterischen Faktoren untersucht.