10.1021/jo00395a028
The study investigates the synthesis and structural elucidation of various halogenated alicyclic monoterpenes derived from the red algae Plocamium violaceum and Plocamium cartilagineum. Key chemicals involved include cyclohexanone, which is used as a reactant in the initial synthesis steps, and aluminum isopropanoxide, which acts as a catalyst. Lithium acetylide-ethylenediamine complex is employed to introduce ethynyl groups, while hydrochloric acid and sodium bicarbonate are used in subsequent steps for acidification and neutralization, respectively. The study also involves the isolation and characterization of specific compounds such as plocamene D, plocamene D', plocamene E, and plocamene C, which are identified through spectroscopic methods including NMR and GC/MS. These compounds exhibit distinct structural features and mass spectral fragmentation patterns, providing insights into their biosynthetic pathways and potential biological activities.