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2,2-Di-(2-phthalimidoethoxy)propane (46.2 gm, 0.11 mole), sodium hydroxide (43.7 gm, 1.10 mole) and 100 mL of H2O were combined and refluxed for 20 hours. After cooling this solution was extracted with p-dioxane in a liquid-liquid extractor for 20 hours. The p-dioxane was removed by rotary evaporation to give a yellow oil. The oil was distilled under reduced pressure yielding 12.5 gm of a clear colourless oil: 0.077 mole, 71%. bp 107°-110° C./0.18 mm Hg. NMR δ(CDCl3)3.41(tr, 4 H, J=6 Hz, CH2O), 2.78(tr, 4 H, J=6 Hz, NCH2), 1.33 (s, 6 H, geminal (CH3)2), 1.20(s, 4 H, NH2).

1. temperaturerefluxed for 20 hours
2. temperatureAfter cooling this solution
3. extractionwas extracted with p-dioxane in a liquid-liquid extractor for 20 hours
4. customThe p-dioxane was removed by rotary evaporation
5. customto give a yellow oil
6. distillationThe oil was distilled under reduced pressure