| 摘要 |
Prodn. of 2-alkenyl-2-oxazolines (I) comprises first reacting anhydrous 2-alkyl-2-oxazoline (II) and HCHO at mole ratio >=1.5:1, to give a 2-(alpha-hydroxymethylalkyl)-2-oxazoline (III). (III) is then recovered and reacted with an alkali(ne earth)hydroxide to give (I). (II) esp. have a 1-18C alkyl substit., opt. with inert substits., having a substitutable H atom on the alpha-C. Pref. first stage is at 90-115 degrees C and at least at 95-200 degrees C. Prodn. of 2-aminoethylmethacnylate salt (IV) comprises reacting equimolar amts. of 2-isopropenyl-2-oxazoline (Ia) and an inorganic acid at is not >20 degrees C in a liq., aq. medium, pref. in presence of a polymerisation inhibitor. (I) and (IV) are useful monomers. They are both obtd. in good yields and (IV) are prod. free from coloured impurities. |
