Propanol 1,1,3,3-tetraphenyl

A. H-[2,4-Bis(, 7>-diphenylimidazolidin-2-yl)-5-hydroxy-phenyl] acetamide. A 500-mL, 3-necked flask equipped with nitrogen inlet, mechanical stirrer, reflux condenser, and thermometer is charged with 88.8 g (0.2 mol) of l,l, 3,3 -tetraphenyl-2,2 -biimidazolidinylidene (Note 1) and 30.2 g (0.2 mol) of 3-acetami-dophenol (Note 2). The system is flushed with and maintained under nitrogen, and 100 mL of chlorobenzene (Note 3) is added. The suspension is stirred at 100°C for 6 hr (Note 4). 2-Propanol (250 mL) is added to the hot mixture, which is then allowed to cool to room temperature. A pale yellow solid precipitates which is filtered and washed with 200 mL of 2-propanol. Drying in vacuum affords 84.6-93.2 g (71-78%) of TV- [2,4-bis( 1,3-diphenylimi-dazolidin-2-yl)-5-hydroxyphenyl]acetamide, mp 254-256°C (Note 5). 

P,P,P, P -Tetraphenyl-p-phenylenediphosphine 218 (Chloro)diphenylphosphine (46 g, 0.2 mole) is dropped slowly into a dispersion of potassium (16 g, 0.4 mole) in dry tetrahydro-furan (250 ml) under nitrogen. The resulting deep red solution is treated, dropwise at room temperature, with a solution of p-dibromobenzene (24 g, 0.1 mole) in tetrahydrofuran (50 ml), and the mixture is heated for 8 h at 67°. After cooling, the product is hydrolysed with water (100 ml) and the organic phase is dried and freed from solvent. The residue is made into a slurry with ethanol and filtered off. The yield is 68% and the m.p. 170-171° (after recrystallization from propanol). 

The diphenylpropiophenone reacts normally with further phenylmagnesium bromide, giving 1,1,3,3-tetraphenyl-l-propanol, m.p. 95-96° 189... 

Recent studies on electrical potential oscillations across a liquid membrane consisting of an oil layer, 90% oleic acid and 10% 1-propanol, containing tetraphenyl phosphonium chloride (TPPC), between aqueous solutions of 0.5 M NaCl and KCl in tow different compartments have been reported by Yoshikawa and Matsubara [52]. TPPC is a cationic lipophilic salt, which can act as a surfactant. On exposure to amine vapour, initially upward deflection occurs, indicating that the KCl solution becomes negative with respect to NaCl solution. Electric potential oscillations did not occur when the concentration of ammonia was below a critical value. 

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