and an acid addition salt of hydroxylamine in an alcohol solvent the reaction is conveniently carried out at the reflux temperature of the alcohol solvent but temperatures from 40 u00b0 to 200 u00b0 c are operable alcohol solvents useful for this reaction include but are not limited to ethanol methanol propanol isopropanol butanol 2 methoxyethanol ethylene glycol and propylene glycol salts of hydroxylamine useful in this reaction include salts with organic or inorganic acids having a pka of less than 2 such as hydroxylamine hydrochloride hydroxylamine hydrobromide and hydroxylamine sulfate the time required for the reaction varies from a few minutes when more reactive isocyanate adducts or higher boiling alcohols are used to a few days or even weeks when less reactive isocyanate adducts or lower boiling alcohols are used the product quinazolinone oxides can be isolated from the reaction mixture by conventional means in most cases the quinazolinone oxides are considerably less soluble than the reactants and will precipitate during the course of the reaction when this occurs the product quinazolinone oxides can be isolated by simply filtering the reaction mixture the 2 aminobenzophenone isocyanate adducts used as starting material can be prepared by the reaction of 2 aminobenzophenones with organic isocyanates as illustrated in the following examples or.