4-(Succinimido)-1-butane sulfonic acid as an efficient and reusable Bronsted acid catalyzed the synthesis of pyrano[4,3-b]pyran derivatives under solvent-free c
The pyndazine hexafluorophosphate[C_4H_5N_2]~+[PF_6]~-(1) undergoes a reversible phase transition around140 K,which was confirmed by the DSC measurement.Variabl