Toluene → N-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propanamido]-2-isododecenylsuccinimide

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A mixture of 2-isododecenylsuccinic anhydride (31.2 g, 111 mmol), 3-(3,5-di-t-butyl-4-hydroxy-phenyl)propanoic acid hydrazide (32.6 g, 111 mmol) and 60 ml of toluene was refluxed for 90 minutes under a nitrogen atmosphere with the azeotropic removal of water (Dean-Stark assembly). The bulk of the solvent was distilled off followed by vacuum stripping of the hot (135° C.) melt for 25 minutes to remove last traces of solvent. After cooling to room temperature, the vacuum was removed. Additional cooling in an acetone/dry ice bath allowed for easy removal of the thermally fractured solid from the vessel. 61.7 g of an amber solid was obtained having a melting range of 62°-68° C.

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