geminal


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geminal

[′jem·ə·nəl]
(organic chemistry)
Referring to like atoms or groups attached to the same atom in a molecule.
References in periodicals archive ?
It is interesting to note that the two geminal methyl groups show a difference of nearly 10 ppm in chemical shift values in [sup.13]C NMR spectrum.
The differences in the [sup.1]H NMR chemical shift of the [H.sub.2]-26 geminal protons ([[DELTA].sub.ab] = 3.92 - 3.63 = 0.29 ppm) and comparison with the chemical shift values in literature (Agrawal 2005; Farid et al.
8,921,299 B2; The Procter & Gamble Company has patented a detergent composition comprising tiron (1,2-dihydroxybenzene-3,5-disulfonic acid, or mono- or di-sulfonate salts of the acid); a ligand capable of chelating to Fe3+, wherein the ligand has a binding constant for Fe3+ that is greater than 1018 M-1, and wherein the ligand is selected from the group consisting of aminocarboxylates containing at least two N atoms, amino-phosphonates containing at least two N atoms, and geminal bisphosphonates; an iron-displacing species selected from the group consisting of phenyl boronic acid, A13+' and mixtures thereof; and at least about 0.2 ppm Fe3+.
GEMINAL DIFLUORINATION OF THE PYRAZOLE RING OF 3,5-DIPHENYL-PYRAZOLE USING AN N-F REAGENT"*, Allyson L.
van Gulick, "The geminal alkyl effect on the rates of ring closure of bromobutylamines," Journal of Organic Chemistry, vol.
2-Acrylamido-2-methyl-1-propane sulfonic acid (AMPS) as the anionic monomer has high reactivity and good hydrolytic stability due to the geminal dimethyl groups and ionization even at low pH values.
Feringa, "Geminal bis-ureas as gelators for organic solvents: gelation properties and structural studies in solution and in the gel state," Chemistry, vol.
These two geminal protons were observed as dd, J, 6.6Hz, 6.8Hz, are the characteristic of the presence of CH2-OH group [19].
As silica contains a large number of silanol groups on its surface in the form of vicinal, geminal, and isolated, it can be considered a very polar filler.
Pandurangan, "Synthesis of geminal diacetates (acylals) using heterogeneous [H.sub.3][PW.sub.12][O.sub.40] supported MCM-41 molecular sieves," Catalysis Communications, vol.
Variations in potency and in the ability of the compounds to bind to crystals in bone one determined by the chemical and three-dimensional structure of the two side chains, [R.sub.1] and [R.sub.2], attached to the central, geminal carbon atom [1-4].