In chemistry the descriptor vicinal (from Latin vicinus = neighbor), abbreviated vic, describes any two functional groups bonded to two adjacent carbon atoms (i.e., in a 1,2-relationship). The word comes from Latin gemini meaning "twins". In context|chemistry|lang=en terms the difference between geminal and vicinal is that geminal is (chemistry) describing identical atoms or groups attached to the same atom in a molecule while vicinal is (chemistry) describing identical atoms or groups attached to nearby (especially adjacent) atoms in a molecule. In a vicinal diol, the two OH groups are on adjacent carbons. A geminal diol, for example, is a diol (a molecule that has two alcohol functional groups) attached to the same carbon atom, as in methanediol. The key difference between geminal and vicinal coupling is that geminal coupling refers to the coupling of two hydrogen atoms that are bound to the same carbon atom.

In chemistry, the descriptor geminal refers to the relationship between two atoms or functional groups that are attached to the same atom. Geminal.
eg CH2CH2CHBr2, the bromines are geminal. Vicinal- comes from latin meaning neighbors. The relative arrangement of two functional groups can also be described by the descriptors α and β.. 1 H NMR Spectroscopy. A vicinal diol (a glycol). A geminal diol. But, vicinal coupling refers to the coupling of two hydrogen atoms that are bound to two adjacent carbon atoms.. Geminal is a see also of vicinal. Mostly, the use of the term vicinal is restricted to two identical functional groups. Illustrated Glossary of Organic Chemistry. For example, the molecule 2,3-dibromobutane carries two vicinal bromine atoms and 1,3-dibromobutane does not. Other articles where Geminal dihalide is discussed: organohalogen compound: Dehydrohalogenation of a dihalide: Treatment of a geminal dihalide (both halogens on the same carbon) or a vicinal dihalide (halogens on adjacent carbons) with a base such as sodium ethoxide (NaOCH2CH3) yields a … 2.

The related term vicinal refers to the relationship between two functional groups that are attached to adjacent atoms. Two atoms or groups being identical and are on neighboring carbons: eg CH2BrCH2Br, the bromines are vicinal. The key difference between geminal and vicinal dihalides is that geminal dihalides have both halide groups attached to the same carbon atom whereas vicinal dihalides have their two halide groups attached to two adjacent carbon atoms in the same compound.. The terms geminal and vicinal are used with chemical compounds having substitutes. Two atoms or groups identical on a carbon. 1.Geminal- comes from latin meaning twins. The prefix vic may be added to the molecule's name to indicate the vicinal relationship.


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