2-(2-Hydroxyalkylidene) cyclopentanones (1) and 5-(2-hydroxyoctylidene)-2- cyclopentenone (2) were synthesized by the aldol reaction of cyclopentanone-enolate (3)/cyclopentenone-enolate (19) with 2-bromoalkanals (4)/2-bromooctanal (4c) and
[Ashikari, Yosuke; Shimizu, Akihiro; Nokami, Toshiki; Yoshida, Jun-Ichi Journal of the American Chemical Society, 2013 , vol. 135, # 43 p. 16070 - 16073]