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substitution group

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  • Substitution reaction — In a substitution reaction, a functional group in a particular chemical compound is replaced by another group.[1][2] In organic chemistry, the electrophilic and nucleophilic substitution reactions are of prime importance. Organic substitution… …   Wikipedia

  • substitution reaction — Chem. the replacement of an atom or group of atoms in a compound by another atom or group. * * * ▪ chemical reaction       any of a class of chemical reactions in which an atom, ion, or group of atoms or ions in a molecule is replaced by another… …   Universalium

  • Substitution cipher — In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the units may be single letters (the most common), pairs of letters, triplets of letters,… …   Wikipedia

  • substitution — 1. In chemistry, the replacement of an atom or group in a compound by another atom or group ( e.g., s. of H by Cl in CH4 to give CH3Cl). 2. In psychoanalysis, an unconscious defense …   Medical dictionary

  • Substitution tiling — A tile substitution is a useful method for constructing highly ordered tilings. Most importantly, some tile substitutions generate aperiodic tilings, which are tilings whose prototiles do not admit any tiling with translational symmetry. The most …   Wikipedia

  • substitution */ — UK [ˌsʌbstɪˈtjuːʃ(ə)n] / US [ˌsʌbstɪˈtuʃ(ə)n] noun [countable/uncountable] Word forms substitution : singular substitution plural substitutions the action of replacing someone or something with someone or something else The substitution was made… …   English dictionary

  • substitution reaction — noun a reaction in which one functional group is replaced with another See Also: nucleophilic substitution, electrophilic substitution …   Wiktionary

  • substitution — sub|sti|tu|tion [ ,sʌbstı tuʃn ] noun count or uncount * the action of replacing someone or something with someone or something else: The substitution was made just minutes before the end of the game. The election led simply to the substitution… …   Usage of the words and phrases in modern English

  • Substitution-permutation network — In cryptography, an SP network, or substitution permutation network (SPN), is a series of linked mathematical operations used in block cipher algorithms such as AES.These networks consist of S boxes and P boxes that transform blocks of input bits …   Wikipedia

  • substitution reaction — Chem. the replacement of an atom or group of atoms in a compound by another atom or group …   Useful english dictionary

  • substitution reaction — a chemical reaction in which one atom or functional group replaces another in a molecule …   Medical dictionary

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