A comprehensive survey has been made of all fatty acids containing halogen atoms covalently bonded to carbon and which are deemed as naturally occurring. Generally thought to be minor components produced by many different organisms, these interesting compounds now number more than 300. Recent research, especially in the marine area, indicates this number will increase in the future. Sources of ...

An efficient method for the simultaneous determination of the degradation products of nonylphenol polyethoxylates (NPnEOs, n = number of ethoxy units), i.e., nonylphenol (NP), NPnEOs (n = 1-3), nonylphenoxy carboxylic acids (NPnECs, n = 1-2, number of ethoxy units plus an acetate) and their halogenated derivatives (XNP, XNP1EO and XNP1EC; X = Br or Cl), in water samples were developed. After tr...

Earlier studies (Tamm et al., 1954; Tamm, 1954) showed that benzimidazole derivatives of very high inhibitory activity on influenza and mumps virus multiplication could be produced by multiple substitution of chlorine atoms in the benzenoid ring with ft-D-ribofuranose present at Ni in the imidazole ring. In subsequent reports (Tarm, 1955; Tamm, 1956) evidence was presented to show that the mode...

Naphthalene, anthracene and phenanthrene are metabolized in rats and rabbits to 1:2-dihydroxy compounds which have been proved to be 1:2dihydro-1:2-diols (Young, 1950; Boyland, 1950). In the benzene series, an o-dihydroxy compound, 4-chlorocatechol, is a major metabolite of chlorobenzene in the rabbit (Spencer & Williams, 1950; Smith, Spencer & Williams, 1950). Many monosubstituted benzenes, e....

Demosponges of the order Verongida such as Ianthella basta exhibit skeletons containing spongin, a collagenous protein, and chitin. Moreover, Verongida sponges are well known to produce bioactive brominated tyrosine derivatives. We recently demonstrated that brominated compounds do not only occur in the cellular matrix but also in the skeletons of the marine sponges Aplysina cavernicola and I. ...

It has been discovered during the past few years that demosponges of the order Verongida such as Aplysina cavernicola exhibit chitin-based skeletons. Verongida sponges are well known to produce bioactive brominated tyrosine derivatives. We could recently demonstrate that brominated compounds do not exclusively occur in the cellular matrix but also in the skeletons of the marine sponges Aplysina...

Heteroacenes developed to widely used building blocks in organic semiconductors for application electronics due their tunable structures and properties concomitant with inherent stability. Here, we report efficient preparation investigation of so far unknown heterotriacenes, basic anti- syn-dithienopyrazine 5 6. The comparison the two isomers respect electronic follow-up reactions gives insight...