Ps. Parameswaran et al., HALOGENATED TERPENOIDS FROM THE BROWN ALGA PADINA-TETRASTROMATICA (HAUCK), Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 33(10), 1994, pp. 1006-1008
Three novel halogenated norsesquiterpenoids, 2-chloro-2, 6, 10-trimeth
ylundecanoic acid (1), its 2-bromo analog (2) and methyl 2-chloro-2-ca
rboxy-6, 10-dimethylundecanoate (3), alongwith fucosterol, 7-ketochole
sterol as well as several fatty acids ranging from 14:0 to 22:0 with p
almitic acid (16:0, 67.4%) and oleic acid (18:1, 17.1%) being the majo
r constituents, have been isolated from the pet. ether soluble fractio
n of the methanol extract of the brown alga Padina tetrastromatica and
their structures elucidated from the respective spectral data.