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ThesaurusAntonymsRelated WordsSynonymsLegend: - of a chemical compound having a ring with seven membersseven-membered - of a chemical compound having a ring with seven members
membered - having members; normally used in chemistry in combination with a number
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In a proof-of-concept study, a Streptomyces enzyme forms five-, six-, and even seven-membered rings at mild temperatures.
However, naturally occurring seco-ring-A friedelane triterpenoids with the A ring expanded to seven-membered ring containing compounds, are relatively rare among secondary metabolites.
The reason for this reversal twist/ distortion could be due to the advantageous thermodynamically stable seven-membered dioxybiphenyl ring conformation by imparting reduced 6,6' hydrogen-hydrogen contacts without broadening the O-P-O angl.
Organic chemists from many countries look at such topics as fluorinated three-membered ring heterocycles, five-membered nitrogen-containing species, synthesizing fluorinated sugars from fluorine-containing synthons, the synthesis and chemical transformation of six-membered aromatic heterocycles containing perfluoro-alkyl groups, and seven-membered and even larger ring-fluorinated heterocycles.
These seven-membered heterocycles have been prepared by a variety of different routes, but the preparation of a completely unsaturated thiazepinone ring has not been reported.