... Volume: Page: ... the appropriate 3-carbomethoxycycloalkenone 4, 1,9-11,14 the ketone was protected as the ethylene ketal 5 using PPTS 15 or p-TsOH ... the allylic alcohol 6 was performed using alcoholic LiAlH 4 17 or, preferably, DIBALH 18 in CH 2 Cl 2 or Et 2 O ...