°C (7 torr), which crystallized in the receiver. Recrystallization from 95% ethanol gave crystals, mp 98-99 °C.Preparation of Dipropionylmesitylene. In a 250-mL three-necked flask fitted with a condenser protected by a drying tube and a magnetic stirrer was placed 5.0 g (0.04 mol) of mesitylene, 14.8 g (0.16 mol) of propionyl chloride, and 75 mL of carbon disulfide. Aluminum chloride (30 g, 0.22 mol) was added to the stirred mixture and the reaction mixture was heated to reflux for 1 h. Carbon disulfide was removed by distillation and the residue was decomposed with ice water, producing a white solid precipitate. The solid was collected on a filter, dried, and recrystallized from petroleum ether (bp 60-80 °C), giving 8.0 g (83%) of white fluffy crystals: mp 101-102 °C (a mixture with 1,1 -dimesitylpropene melted at 77-80 °C); NMR (CDC13) 1.2 (t, 6 ), 2.05 (s, 3 ), 2.18 (s, 6 H), 2.68 (q, 4 H), 7.25 (s,
Aus den α‐Oxo‐ketendithioacetalen (I) entstehen mit Organolithiumverbindungen die Alkohole (II), aus denen mit HBF4 die Folgeprodukte (III) und (IV) erhalten werden.
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