ring substitution
1Substitution 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… …
2ring-in — /ˈrɪŋ ɪn / (say ring in) noun Colloquial 1. a racehorse or greyhound substituted for another in a race. 2. the act of making such a substitution. 3. a person substituted for another at the last minute: Pat couldn t come, so I m the ring in. 4. a… …
3Electrophilic aromatic substitution — or EAS is an organic reaction in which an atom, usually hydrogen, appended to an aromatic system is replaced by an electrophile. The most important reactions of this type that take place are aromatic nitration, aromatic halogenation, aromatic… …
4Nucleophilic aromatic substitution — A nucleophilic aromatic substitution is a substitution reaction in organic chemistry in which the nucleophile displaces a good leaving group, such as a halide, on an aromatic ring. There are 6 nucleophilic substitution mechanisms encountered with …
5Composition ring — In mathematics, a composition ring, introduced in (Adler 1962), is a commutative ring (R, 0, +, −, ·), possibly without an identity 1 (see non unital ring), together with an operation such that, for any three elements one has …
6Arene substitution patterns — are part of organic chemistry IUPAC nomenclature and pinpoint the position of substituents other than hydrogen in relation to each other on an aromatic hydrocarbon. Contents 1 Ortho, meta, and para substitution 2 Ipso, meso, and peri substitution …
7Aromatische elektrophile Substitution — Unter der elektrophilen aromatischen Substitution abgekürzt als SEAr versteht man eine elektrophile Substitutionsreaktion an einer aromatischen Verbindung. Während bei Aliphaten Substitutionen häufig nukleophiler Natur sind, werden Aromaten… …
8Elektrophile aromatische Substitution — Unter der elektrophilen aromatischen Substitution – abgekürzt als SEAr – versteht man eine elektrophile Substitutionsreaktion an einer aromatischen Verbindung. Während bei Aliphaten Substitutionen häufig nukleophiler Natur sind, werden Aromaten… …
9Heterozyklischer Ring — Struktur von Thiophen Heterocyclen sind cyclische chemische Verbindungen mit ringbildenden Atomen aus mindestens zwei verschiedenen chemischen Elementen. Der Name setzt sich zusammen aus griechisch hetero = anders, fremd und lateinisch cyclus =… …
10Nucleophilic substitution — In organic and inorganic chemistry, nucleophilic substitution is a fundamental class of reactions in which an electron nucleophile selectively bonds with or attacks the positive or partially positive charge of an atom or a group of atoms called… …
