
%0 Journal Article
%A Coll, JC 
%A Wright, AD 
%T Tropical Marine Algae. III. New Sesquiterpenes From <I>Laurencia majuscula</I> (Rhodophyta, Rhodophyceae, Ceramiales, Rhodomelaceae)
%J Australian Journal of Chemistry
%D 1989/09/01
%V 42
%N 9
%P 1591-1603
%K 
%R https://doi.org/10.1071/CH9891591
%U https://www.publish.csiro.au/paper/CH9891591 
%X The isolation and structural elucidation of new sesquiterpenes from Laurencia  majuscula, collected from Zoe Bay, Hinchinbrook Island, North Queensland, are reported. One collection contained the novel triquinane derivative: (1S*,2S*,3S*,5S*,8S*,9S*)- tricyclo [6.3.0.01.5] undecan-2-ol (3), and four halogenated chamigrene derivatives: the known 1(15)Z compound (4) and the new (1(15)E,2Z,4S,8R,9S)-8,15-dibromochamigra-1(15,2,1112-trien-9-ol (5), the known isoobtusadiene (6) and the new metabolite (1S,2S,4R,8R,9S)-1-chloro-2,8-dibromochamigr-11(12)-en-9-ol (7). A second collection afforded the same range of sesquiterpenes (3)-(7)and an additional tricyclic sesquiterpene related to ( &#916;10)- rhodolaureol (16), namely ( &#916; 11(12))-isorhodolaureol (8). The relationship was confirmed by oxidation of (8) to give the expected non-conjugated enone (15) which rearranged in slightly acidic chloroform to the conjugated enone (17), identical with the oxidation product from rhodolaureol (16). 
