The phthalazine Reissert compound hydrofluoroborate undergoes condensation with alkynes to give pyrrolo[2,1‐α]phthalazines and with alkenes to give 2‐(1‐phthalazyl)pyrroles. The phthalazine Reissert compound undergoes acid catalyzed condensations with some alkenes but the intermediate is of sufficient stability to be isolated. This same type of intermediate can also be isolated in the acid‐catalyzed hydrolysis of the phthalazine Reissert compound.
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Bhattacharjee et al. (1980) studied this question.
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