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Synthesis and Diethylamine Induced Ring-Opening of exo and endo Hexahydro-7-oxa-2,5,6a-triaza-cyclopenta[a]pentalene-1,3-diones. -The title reaction results in stereoselective formation of endo-fused ring systems of type (III). The degree of selectivity slightly depends on the nature of the maleimide substituents. In the presence of secondary amines, the endo and exo products undergo an interesting and unprecedented ring-opening giving imidazolines of type (V). The expected double cis-elimination to pyrrolidin-3-ols does not occur. - (COSKUN*, N.; MERT, H.; ARIKAN, N.; Tetrahedron 62 (2006) 7, 1351-1359; Dep. Chem., Uludag Univ., TR-16059 Bursa, Turk.; Eng.) -Jannicke 24-128