K. Huben et al., PHOTOCHEMICAL-TRANSFORMATIONS OF 3,3,4,7-TETRAMETHYLPYRAZOLO[3,4-D]PYRIDAZINE IN SOLUTION AND FROZEN GAS MATRICES, Journal of the Chemical Society, Chemical Communications, (3), 1995, pp. 315-316
Photochemical transformations of pyrazolopyridazine 1 give isopropenyl
pyridazine 2 in addition to cyclopropapyridazine 3 in solution and to
the ring-opened diazo isomer 4 observed in frozen gas matrices.