Bromopinacolone → 2-(3,3-Dimethyl-2-oxobutyl)-1H-isoindole-1,3(2H)-dione

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Reaction Steps

Potassium phthalimide (82.86 g, 0.447 mol) is added to a stirred solution of bromopinacolone (80.10 g, 0.447 mol) in toluene (300 ml). The-suspension is refluxed for 19 h, cooled, and then the precipitate is filtered off and discarded. The filtrate is cooled in an ice-bath and treated with petroleum ether (550 ml). The resulting precipitate is collected by filtration. The mother liquor is reduced to circa 100 ml by evaporation in vacuo, and a further quantity of precipitate which forms is collected by filtration and combined with the first crop, giving 2-(3,3-dimethyl-2-oxo-butyl)-isoindole-1,3-dione (total yield 83.5 g, 76%) as colourless crystals, m.p. 96-99° C.

Provenance & Evidence