Bromonitroethenylfuran (BNEF) is prepared from furfural in a two-step process. A primary amine is reacted with furfural in an organic solvent at the reflux temperature of the solvent to form the Schiff base. The organic solvent and the water formed in the foregoing reaction are removed from the Schiff base, which is then dissolved in a polar, water-miscible solvent. Bromonitromethane is added to the Schiff base solution and reacts with the Schiff base to form BNEF, which can be readily isolated by precipitation.
Bromonitroethenylfuran(BNEF)是从
糠醛(furfural)经过两步反应制备而成。首先,在有机溶剂中,将一种一级胺与
糠醛在溶剂的沸点下反应,形成席夫碱(Schiff base)。然后,将席夫碱中产生的有机溶剂和
水去除,将其溶解在极性、可与
水混溶的溶剂中。接着,将
溴硝
甲烷加入席夫碱溶液中,与席夫碱反应形成BNEF,可以通过沉淀轻松地分离出来。