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Position isomers (also positional isomers or regioisomers) are structural isomers that can be viewed as differing only on the position of a functional group, substituent, or some other feature on the same "parent" structure.
Discounting isomers that are equivalent under rotations, there are nine isomers that differ by this criterion, and behave as different stable substances (two of them being enantiomers of each other). The most common one in nature ( myo -inositol) has the hydroxyls on carbons 1, 2, 3 and 5 on the same side of that plane, and can therefore be ...
There are two types of naphthylethylamines based on positional isomerism: 1-naphthylethylamines and 2-naphthylethylamines. Examples of these include 1-naphthylaminopropane (1-NAP) and 2-naphthylaminopropane (2-NAP), respectively.
The natural isomerism of cocaine is unstable and prone to epimerization. For example, the end product of cocaine biosynthesis contains an axial C2-carbomethoxy moiety which readily undergoes epimerization to the equatorial position via saponification .
There are several isomers of hexene, [1] depending on the position and geometry of the double bond in the chain. One of the most common industrially useful isomers is 1-hexene , an alpha-olefin . Hexene is used as a comonomer in the production of polyethylene .
Traditionally, double bond stereochemistry was described as either cis (Latin, on this side) or trans (Latin, across), in reference to the relative position of substituents on either side of a double bond. A simple example of cis–trans isomerism is the 1,2-disubstituted ethenes, like the dichloroethene (C 2 H 2 Cl 2) isomers shown below. [7]
Chemical structure of 2-chlorophenol. A chlorophenol is any organochloride of phenol that contains one or more covalently bonded chlorine atoms. There are five basic types of chlorophenols (mono- to pentachlorophenol) and 19 different chlorophenols in total when positional isomerism is taken into account.
Monobromrophenols have three isomers because there is only one bromine atom that can occupy one of three ring positions on the phenol molecule; 2-bromophenol, for example, is the isomer that has a bromine atom in the ortho position.