Rivularia firma

They were obtained for the most part from animal rather than plant sources, but some that do fall within the scope of this review include 5 -deoxy-5-iodotubercidin (88), obtained from the Western Australian red alga Hypnea valendiae [104], and the bisindole 89 from the blue-green alga Rivularia firma [105]. 

Optically active polybrominated biindoles 344 and 345 presenting a hindered rotation about the N-C bond have been isolated from Rivularia firma algae collected in Westernport Bay (Australia). They were fully characterized by spin-lattice relaxation data. 

After having shown some examples of aromatic bromi-nated derivatives and more complex molecules having a vinyl bromine, it is a good idea to mention a particular series of polybrominated bis-indoles, all isolated from the species Rivularia firma and collected in Australia. 

Norton, R.S. and Wells, R.J. (1982) A series of chiral polybrominated biindoles from the marine blue-green alga Rivularia firma. Application of C NMR spin-lattice relaxation data and C- H coupling constants to structure elucidation. J. Am. Chem. Soc., 104, 3628-3635. 

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