Secondary (chemistry)
Term in organic chemistry used to describe degree of substitution of an atom in a molecule / From Wikipedia, the free encyclopedia
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Secondary is a term used in organic chemistry to classify various types of compounds (e. g. alcohols, alkyl halides, amines) or reactive intermediates (e. g. alkyl radicals, carbocations). An atom is considered secondary if it has two 'R' Groups attached to it.[1] An 'R' group is a carbon containing group such as a methyl (). A secondary compound is most often classified on an alpha carbon (middle carbon) or a nitrogen. The word secondary comes from the root word 'second' which means two.
Red highlighted central atoms in various groups of chemical compounds. Secondary central atoms compared with primary, tertiary und quaternary central atoms. | ||||
primary | secondary | tertiary | quaternary | |
Carbon atom in an alkane |
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This nomenclature can be used in many cases and further used to explain relative reactivity. The reactivity of molecules varies with respect to the attached atoms. Thus, a primary, secondary, tertiary and quaternary molecule of the same function group will have different reactivities.