N. Celebi et al., 1,3-DIPOLAR CYCLOADDITION REACTIONS OF SOME 3-ARYL-PHTHALAZINIUM-1-OLATES .2., Bulletin des Societes chimiques belges, 104(10), 1995, pp. 595-598
Reactions of some new 3-aryl-phthalazinium-1-olates were studied with
olefinic and acetylenic dipolarophiles giving the expected cycloadduct
s. However, the cycloaddition of ,6'-dimethylpyrimidin-2'-yl)-phthalaz
inium-1-olate with ethyl acetylenecarboxylate was not regioselective a
nd gave a mixture of two possible regioisomers.