Pentethylcyclanone can be prepared by alkylation of the anion of the self-condensation product of cyclopentanone with N-(2-chloroethyl)-morpholine.[1]
References
^DE 1059901, Ueberwasser H, "Verfahren zur Herstellung von substituierten 2-Amino-alkylcycloalkanonen bzw, ihren Salzen [Process for the preparation of substituted 2-amino-alkylcycloalkanones or their salts]", published 1959-06-25, assigned to Ciba AG