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To a solution of 15.00 g (105.49 mmol) 2,2-dimethyl-3,5-hexanedione in 50 mL of toluene loaded with 30.00 g sodium sulfate was added 12.47 g (210.97 mmol) isopropylamine. The mixture was refluxed for 4 days. Removal of toluene resulted in a yellow oil, which was subjected to vacuum transfer at 80° C. under 125 mTorr. 16.5 g of clear oil was obtained with a yield of 84%. 1H NMR (500 MHz, C6D6): δ=11.50 (s, 1H), 5.16 (s, 1H), 3.11 (m, 1H), 1.49 (s, 3H), 1.31 (s, 9H), 0.79 (d, 6H).

1. temperatureThe mixture was refluxed for 4 days
2. customRemoval of toluene
3. customresulted in a yellow oil, which
4. customwas subjected to vacuum transfer at 80° C. under 125