Some hexachloronaphthalene (HxCN) isomers may be classified as having an order of magnitude grater dioxinlike potency as compared to octachloro- and octabromo dibenzo-p-dioxin and dibenzofuran
Summary: Aervfuranoside (1), a new chlorinated dibenzofuran
glycoside together with ten (2-11) known compounds were isolated from ethyl acetate soluble fraction of methanolic extract of the flowers of Aerva javanica.
These include zeorin, methyl-[beta]-orcinolcarboxylate, methylorsellinate [16, 35], sekikaic acid, salazinic acid, and dibenzofuran
usnic acid .
Lichens synthesize unique secondary metabolites, especially depsides, depsidones, and dibenzofuran
derivatives with phenol groups in their structure and mainly through the acetyl polymalonyl biosynthetic pathway .
Consequently, oxygen containing heterocycles (benzofuran, methylbenzofuran, dibenzofuran
), carbonyl groups characterizing aldehydes and ketones (acetonaphthones, benzophenones, benzoquinones, benzaldehydes and their hydroxyl- and hydroxylmethyl derivatives), sulfur containing heterocycles (benzothiazole, benzoisothiazole), and nitriles (benzonitrile and aliphatic nitriles with long hydrocarbon chains) represent other groups of organic compounds identified in this extract.
On the other hand, two pulvinic acid derivatives, vulpinic acid ([t.sub.R] = 30.336 min) and pinastric acid ([t.sub.R] = 32.350 min), and dibenzofuran
usnic acid ([t.sub.R] = 39.463 min) were the predominant metabolites in the Vulpicida canadensis methanol extract.
Infection or malnutrition, nutritional deficiency for example hypovitaminosis,5 and environmental factors (Polychlorinated biphenyls and Dibenzofuran
) also contribute in the pathogenesis of natal teeth.6,7 Natal teeth are associated with genetic conditions and other diseases such as, Hallermann-Strieff syndrome,8
The relative abundance of dibenzothiophene (SF) in TFs, which include fluorene (F), dibenzothiophene (DBT) and dibenzofuran
(DBF), is very high, even up to 78.94% (Fig.
On the other hand, cyclopentenediones, furans, furfurals, levoglucosenone and dibenzofuran
originate from fresh and/or degraded carbohydrates (Buurman and Roscoe 2011).
The various heterocyclic rings substituted on the dibenzofuran
scaffold do not seem to have strong interactions with the binding pocket of MMP-12 as it was suggested previously by X-ray crystallography .
accolens (Staiger & Kalb, 1995) which contains epithecial pigment haematommone and the medullary dibenzofuran
These papers represent some of the latest developments and covers some surprisingly multidisciplinary topics, such as the elucidation of electron-transfer pathways in copper and iron proteins by pulse radiolysis; peptide- or protein-cleaving agents based on metal complexes; the structure of coordination polymers of the lanthanide elements; the supramolecular chemistry of gases; the organometallic chemistry of Rh-, Ir , Pd- and Pt-based radicals; unique complexes in the diverse world of metal-alkyne chemistry; oxygen activation chemistry of Pacman and Hangman porphyrin architecture based on xanthene and dibenzofuran
spacers; metal-containing nucleic acid structures based on synergetic hydrogen and coordination bonding; and bispidine coordination chemistry.