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The cyclopenta[c]pyrrole‐4‐carbonitrile (3) is transformed by hyrlroxylamine in hot alcohol to 4,5,6,6a‐tetrahydro‐l‐imino‐3,5,5,6a‐tetramethyl‐4‐cyclopenta[c]pyrrole methyl ketone oxime (5) in contrast to the cyclopentapyrrole 10 which afforded 1,2‐diacetyl‐3,3,5,5‐tetramethyl‐cyclopentene dioxime (11). The cyclopenta[c]pyrrole‐4‐carboxamide 1 (R = C6H5) yielded the isomeric 2a,3,4,4a,5,6,6a,6b‐octahydro‐2a,4,4,6a‐tetramethyl‐5‐(phenylimino)pentaleno[1,6‐bc]‐pyrrol‐2‐(1H)one (12) in hot dilute hydrochloric acid or hot 99% phosphoric acid. The amide 1 (R = C6H5) was transformed in the solid state by oxygen over a period of several months to a mixture of the isomeric anils, 13 and 14 of 1,7‐diacetyl‐7‐hydroxy‐4,6,6‐trimethyl‐2‐azabicyclo‐[2.2.l.]heptan‐3‐one(16).

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