Definition of substituent in English:

substituent

noun səbˈstɪtjʊəntˌsəbˈstɪtʃəwənt

Chemistry

An atom or group of atoms taking the place of another atom or group or occupying a specified position in a molecule.
〔化〕取代基（团）；取代原子
displacement of alkyl substituents
as modifier the presence of substituent hydrogen atoms
Example sentencesExamples
- Under rigorous conditions benzene will undergo substitution for one of its hydrogen substituents, by a process called electrophilic aromatic substitution.
- In an interstitial solid solution, substituent atoms or ions are added to void spaces (interstitial sites) between normal atomic sites.
- Other substituents coax beta-peptides into antiparallel hairpin and sheetlike structures.
- These compounds differ in the level of oxidation of the flavane nucleus and in the number and position of hydroxyl, methyl, and methoxyl substituents.
- Any groups attached to the main chain are called substituents, they are there in place of hydrogen atoms.

Origin

Late 19th century: from Latin substituent- 'standing in place of', from the verb substituere (see substitute).

Definition of substituent in US English:

substituent

nounˌsəbˈstɪtʃəwəntˌsəbˈstiCHəwənt

Chemistry

An atom or group of atoms taking the place of another atom or group or occupying a specified position in a molecule.
〔化〕取代基（团）；取代原子
displacement of alkyl substituents
as modifier the presence of substituent hydrogen atoms
Example sentencesExamples
- Other substituents coax beta-peptides into antiparallel hairpin and sheetlike structures.
- Any groups attached to the main chain are called substituents, they are there in place of hydrogen atoms.
- In an interstitial solid solution, substituent atoms or ions are added to void spaces (interstitial sites) between normal atomic sites.
- These compounds differ in the level of oxidation of the flavane nucleus and in the number and position of hydroxyl, methyl, and methoxyl substituents.
- Under rigorous conditions benzene will undergo substitution for one of its hydrogen substituents, by a process called electrophilic aromatic substitution.

Origin

Late 19th century: from Latin substituent- ‘standing in place of’, from the verb substituere (see substitute).

词汇	substituent
释义	Definition of substituent in English: substituent noun səbˈstɪtjʊəntˌsəbˈstɪtʃəwənt Chemistry An atom or group of atoms taking the place of another atom or group or occupying a specified position in a molecule. 〔化〕取代基（团）；取代原子 displacement of alkyl substituents as modifier the presence of substituent hydrogen atoms Example sentencesExamples Under rigorous conditions benzene will undergo substitution for one of its hydrogen substituents, by a process called electrophilic aromatic substitution. In an interstitial solid solution, substituent atoms or ions are added to void spaces (interstitial sites) between normal atomic sites. Other substituents coax beta-peptides into antiparallel hairpin and sheetlike structures. These compounds differ in the level of oxidation of the flavane nucleus and in the number and position of hydroxyl, methyl, and methoxyl substituents. Any groups attached to the main chain are called substituents, they are there in place of hydrogen atoms. Origin Late 19th century: from Latin substituent- 'standing in place of', from the verb substituere (see substitute). Definition of substituent in US English: substituent nounˌsəbˈstɪtʃəwəntˌsəbˈstiCHəwənt Chemistry An atom or group of atoms taking the place of another atom or group or occupying a specified position in a molecule. 〔化〕取代基（团）；取代原子 displacement of alkyl substituents as modifier the presence of substituent hydrogen atoms Example sentencesExamples Other substituents coax beta-peptides into antiparallel hairpin and sheetlike structures. Any groups attached to the main chain are called substituents, they are there in place of hydrogen atoms. In an interstitial solid solution, substituent atoms or ions are added to void spaces (interstitial sites) between normal atomic sites. These compounds differ in the level of oxidation of the flavane nucleus and in the number and position of hydroxyl, methyl, and methoxyl substituents. Under rigorous conditions benzene will undergo substitution for one of its hydrogen substituents, by a process called electrophilic aromatic substitution. Origin Late 19th century: from Latin substituent- ‘standing in place of’, from the verb substituere (see substitute).
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