Tri-n-propyl carbinol

Triphenylcarbinol, 811, 813, 814, 816 Triphenylchloromethane, 811, 815, 952 Triphenylguanidine, 643 Triphenylmethane, 509, 515 Triphenylmethyl sodium, 477,479 Triple point, 37, 38 Tri-n-propyl carbinol. 259 Trityl chloride, 815... 

Alkyl and aryl groups have a stabilising effect on the cyclopropenium cation, the former being the more effective, e.g. p g+ values for the tri-n-propyl and triphenyl derivatives are, respectively, 7,2 and 0.5 [5]. Of a series of trialkylcyclopropenium salts the plfg+ values indicated stabilities in the order methyl > n-propyl > isopropyl t-butyl [27]. This order is not that to be expected solely from a consideration of inductive effects. Steric factors may play a role in that vicinal crowding is lessened when the carbinol is formed ... 

Solvent extraction by tributyl phosphate (TBP) (13, 96), dithizone (20, 71, 72), cupferron (89), thenoyl trifluoroacetone (TTA) (55), diiso-propyl ketone (26), mesityl oxide (92), tri-n-benzylamine and methyl di-n-octylamine (99), diisopropyl and diisobutyl carbinol (100) have all found some application on the trace scale. Acetylaeetone and methyl isobutyl ketone extract milligram amounts of polonium almost quantitatively from hydrochloric acid, but the stable polonium-organic compounds which are formed make it difficult to recover the polonium in a useful form from solutions in these ketones (7). Ion exchange (22, 115, 119) and paper chromatography (44, 87) have also been used for trace scale separations of polonium, but the effects of the intense alpha-radiation on organic com-... 

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