Condensation derivatives of 4-isopropylbenzaldehyde with acetophenone from the red alga Laurencia tristicha

Seven undescribed condensation derivatives of 4-isopropylbenzaldehyde with acetophenone, including one 1,3,5-trisubstituted pentane-1,5-dione, two 1,3,4,5,7-pentasubstituted heptane-1,7-diones and four 1,2,3,4,5-pentasubstituted cyclohexanols, together with two known flavonoids, were obtained from the red alga Laurencia tristicha. The relative configurations were elucidated by extensive spectroscopic data analysis of MS, 1D and 2D NMR, while the...