Membered Ring

Some articles on membered ring, ring, rings:

Endohedral Hydrogen Fullerene - Organic Synthesis
... of the first step, the creation of a 13 membered ring orifice on the fullerene surface ... In this reaction nitrogen is expulsed and an 8-membered ring is formed (3) ... with singlet oxygen in carbon tetrachloride which causes one of the ring alkene groups to oxidize to a ketone ...
Cyanogen Bromide - Biochemical Applications - Protein Cleavage - Mechanism
... This attack is followed by the formation of a five-membered ring as opposed to a six-membered ring, which would entail the formation of a double bond in the ring between nitrogen and carbon ... This double bond would result in a rigid ring conformation, thereby destabilizing the molecule ... Thus, the five-membered ring is formed so that the double bond is outside the ring, as shown in the figure ...
Smiles Arbitrary Target Specification - SMARTS Syntax - Cyclicity
... As originally defined by Daylight, the R descriptor is used to specify ring membership ... In the Daylight model for cyclic systems, the smallest set of smallest rings (SSSR) is used as a basis for ring membership ... For example indole is perceived as a 5-membered ring fused with a 6-membered ring rather than a 9-membered ring ...
Cannabinoid Receptor Antagonist - Drug Design - Other Derivatives
... used to develop analogs of rimonabant was to replace central pyrazole ring by another heterocycle ... An example of these is a purine derivative where a pyrimidine ring is fused to an imidazole ring ... Several research groups have studied six-membered ring pyrazole bioisosteres ...

Famous quotes containing the word ring:

    What is a novel? I say: an invented story. At the same time a story which, though invented has the power to ring true. True to what? True to life as the reader knows life to be or, it may be, feels life to be. And I mean the adult, the grown-up reader. Such a reader has outgrown fairy tales, and we do not want the fantastic and the impossible. So I say to you that a novel must stand up to the adult tests of reality.
    Elizabeth Bowen (1899–1973)