Cyclopentanone reacts with arylidenemalononitriles 1a–c to give dihydro‐4,6‐indenedicarbonitriles 5a–c . Similarly, the diethyl dihydro‐4,6‐indenedicarboxylate derivative 6 is formed when treating ethyl α‐cyanocinnamate ( 1d ) with cyclopentanone. Cyclopenta[ b ]pyrans 5a–c are obtained from the reaction of diarylidene derivatives of cyclopentanone with malononitrile.
No takes yet. Share an insight, caveat, or question.
Sofan et al. (1989) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: