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where one of the single bonds is to a hydrogen. The group is also called methyne or methene, but its IUPAC systematic name is methylylidene or methanylylidene...

porphyrin ligands, TPP2− is highly symmetrical. Another difference is that its methyne centers are occupied by phenyl groups. Simplified view of heme, a complex...

related to the parent benzothiazole, but with an amino group at the unique methyne position on the thiazole ring. As confirmed by X-ray crystallography, it...

whose skeleton can be described as two pyrrole rings C 4N connected by a methyne bridge =CH– through their nitrogen-adjacent (position-2) carbons; the remaining...

feature of the dithiolanes and dithianes derived from aldehydes is that the methyne group can be deprotonated and the resulting carbanion alkylated. 1,2-Ethanedithiol...

a methylene spacer or methanediyl group. Methyl group Methylene group Methyne "Active methylene compound". House, Herbert O. (1972). Modern Synthetic...

acids are isomers of the truxillic acids with phenyl groups on adjacent methyne centers. Cohen, M. D.; Schmidt, G. M. J.; Sonntag, F. I. (1964). "Topochemistry...

methyl, –CH3), 15–55 (secondary, methylene, –CH2–), 20–60 (tertiary, methyne, C–H) and quaternary. The carbon-13 resonance of quaternary carbon atoms...

coplanar. The heterocyclic core of the molecule is readily substituted at the methyne (CH) centre in the thiazole ring. Thiazole is electron-withdrawing. Benzothiazoles...

treatment with ketones and aldehydes. When derived from aldehydes, the methyne (=CH−) group is sufficiently acidic that it can be deprotonated and the...

some D-amino acid residues. Racemization occurs via deprotonation of the methyne that is alpha to the amido group. Rates increase with pH. Many D-amino...

McMurry's in-bicyclo[4.4.4]-tetradecyl cation, the alkene across from the methyne hydrogen was protonated by trifluoroacetic acid (TFA) to allow a bridge...