Mc. Aversa et al., 1,5-BIS-(2-HYDROXYBENZYL)-1,5-DIAZOCANE-2,6-DIONES FROM 3-(2-HYDROXYBENZYLAMINO)ALKANECARBOXYLIC ACIDS, Journal of chemical research. Synopses, (12), 1993, pp. 492-493
A mixture of phosphorus oxychloride and zinc chloride under reflux con
verts 3-(2-hydroxybenzylamino)alkanecarboxylic acids into 1,5-bis-(2-h
ydroxybenzyl)-1,5-diazocane-2,6-diones with moderate to good yields.