What is metamerism? Give the structure and IUPAC name of metamers of 2- Methoxypropane.
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The terms metamerism, or metamer, in a sense of chemical isomerism (there are other meanings in zoology and colorimetry), are very old. Presently, they are not used nor mentioned in authoritative chemistry texts.
Even the old Watts’ Dictionary of Chemistry from 1892 states the related terms do not have conclusive definition:
ISOMERISM. Even a superficial reader of chemical literature will soon become aware that the term isomericand the kindred expressions allotropic, metameric, and polymeric are by no means always used in consistent senses, and he will have considerable difficulty in clearly realising their exact and relative import; (…)
(…)
METAMERISM. This term is generally applied to those cases if isomerismwherein compounds show identity of elementary composition, but belong to different types of classes (…).
(…)
(…) For example, it has long been a question whether ethylic acetoacetate is to be represented as CH3−CO−CH2−CO2EtCHX3−CO−CHX2−COX2Et or by the formula CH3−C(OH)=CH−CO2EtCHX3−C(OH)=CH−COX2Et. A discussion of such causes has been given by Laar (…), who proposes to term such isomerides tautomeric. But, as he practically himself admits, the use of such a term savours of tautology. V. Meyer subsequently brought forward a suggestion of Jacobson's to substitute desmotropicfor tautomeric. Hantzsch and Herrmann (…), while using the term tautomerism when speaking of compounds capable of passing from the one type into the other, proposed to limit the term desmotropic to each of the states. As the phenomena in question are the outcome of mobility and not of fixity, the new term also appears to be particularly ill chosen, and bearing in mind the intention of Berzelius in introducing the term metameric (see p. 81), it would appear that this old term is a peculiarly appropriate one to use in such cases. (…)
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The terms metamerism, or metamer, in a sense of chemical isomerism (there are other meanings in zoology and colorimetry), are very old. Presently, they are not used nor mentioned in authoritative chemistry texts.
Even the old Watts’ Dictionary of Chemistry from 1892 states the related terms do not have conclusive definition:
ISOMERISM. Even a superficial reader of chemical literature will soon become aware that the term isomericand the kindred expressions allotropic, metameric, and polymeric are by no means always used in consistent senses, and he will have considerable difficulty in clearly realising their exact and relative import; (…)
(…)
METAMERISM. This term is generally applied to those cases if isomerismwherein compounds show identity of elementary composition, but belong to different types of classes (…).
(…)
(…) For example, it has long been a question whether ethylic acetoacetate is to be represented as CH3−CO−CH2−CO2EtCHX3−CO−CHX2−COX2Et or by the formula CH3−C(OH)=CH−CO2EtCHX3−C(OH)=CH−COX2Et. A discussion of such causes has been given by Laar (…), who proposes to term such isomerides tautomeric. But, as he practically himself admits, the use of such a term savours of tautology. V. Meyer subsequently brought forward a suggestion of Jacobson's to substitute desmotropicfor tautomeric. Hantzsch and Herrmann (…), while using the term tautomerism when speaking of compounds capable of passing from the one type into the other, proposed to limit the term desmotropic to each of the states. As the phenomena in question are the outcome of mobility and not of fixity, the new term also appears to be particularly ill chosen, and bearing in mind the intention of Berzelius in introducing the term metameric (see p. 81), it would appear that this old term is a peculiarly appropriate one to use in such cases. (…)
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Hii dear here is your answer
The terms metamerism, or metamer, in a sense of chemical isomerism (there are other meanings in zoology and colorimetry), are very old. Presently, they are not used nor mentioned in authoritative chemistry texts.
Even the old Watts’ Dictionary of Chemistry from 1892 states the related terms do not have conclusive definition:
ISOMERISM. Even a superficial reader of chemical literature will soon become aware that the term isomericand the kindred expressions allotropic, metameric, and polymeric are by no means always used in consistent senses, and he will have considerable difficulty in clearly realising their exact and relative import; (…)
(…)
METAMERISM. This term is generally applied to those cases if isomerismwherein compounds show identity of elementary composition, but belong to different types of classes (…).
(…)
(…) For example, it has long been a question whether ethylic acetoacetate is to be represented as CH3−CO−CH2−CO2EtCHX3−CO−CHX2−COX2Et or by the formula CH3−C(OH)=CH−CO2EtCHX3−C(OH)=CH−COX2Et. A discussion of such causes has been given by Laar (…), who proposes to term such isomerides tautomeric. But, as he practically himself admits, the use of such a term savours of tautology. V. Meyer subsequently brought forward a suggestion of Jacobson's to substitute desmotropicfor tautomeric. Hantzsch and Herrmann (…), while using the term tautomerism when speaking of compounds capable of passing from the one type into the other, proposed to limit the term desmotropic to each of the states. As the phenomena in question are the outcome of mobility and not of fixity, the new term also appears to be particularly ill chosen, and bearing in mind the intention of Berzelius in introducing the term metameric (see p. 81), it would appear that this old term is a peculiarly appropriate one to use in such cases. (…)
Hope it's help u
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