[C:1]([O:7]C)(=O)[C:2]([CH3:5])([CH3:4])[CH3:3].[H-].[Na+].CO.[C:13](#[N:16])[CH2:14][CH3:15]>C1(C)C=CC=CC=1>[CH3:15][CH:14]([C:1](=[O:7])[C:2]([CH3:5])([CH3:4])[CH3:3])[C:13]#[N:16]234.6 grams (2 moles) of methyl pivalate and 120 grams (2 moles) of sodium hydride (80 weight % suspension in white oil) were heated to 90° C. in 1500 ml of dry toluene. There were dropped in at this temperature after addition of 1 ml of methanol 233.3 grams (2 moles) of propionitrile within 2.5 hours. After the end of the development of hydrogen the suspension was extracted with a total of 1200 ml of water and after phase separation the aqueous phase was acidified with concentrated HCl to a pH of 2. The deposited oil was separated off, the water phase extracted with chloroform, the organic extracts combined, dried and concentrated. The residue was fractionated in a water jet vacuum. 2,4,4-trimethyl-3-oxopentanenitrile came over at 87° C./11 Torr in an amount of 226.1 grams (81.2% of theory).
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