ethyl 2-methyl-1-(2-pentyn-1-yl)-3-cyclopenten-5-one-1-carboxylate

3-bromo-2-[(Z)-2-pentenyl]-2-cyclopenten-1-one

1-iodopent-2-yne

3-(2-methylpropoxy)cyclopent-2-en-1-one

3-isobutoxy-5-methyl-2-cyclopentenone