ring closure reaction

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• ring closure — noun : a chemical reaction in which an open chain of atoms is closed to form a ring : cyclization …   Useful english dictionary

• Nazarov cyclization reaction — The Nazarov cyclization reaction (often referred to as simply the Nazarov cyclization) is a chemical reaction used in organic chemistry for the synthesis of cyclopentenones. The reaction is typically divided into classical and modern variants,… …   Wikipedia

• Electrocyclic reaction — In organic chemistry, an electrocyclic reaction is a type of pericyclic rearrangement reaction where the net result is one pi bond being converted into one sigma bond. These reactions are usually unnamed, being categorized by the following… …   Wikipedia

• Pictet-Spengler reaction — The Pictet Spengler reaction is a chemical reaction in which a beta; arylethylamine such as tryptamine undergoes ringclosure after condensation with an aldehyde. Usually an acidic catalyst is employed and the reaction mixture heated, [] An… …   Wikipedia

• Prins reaction — are formed. HistoryThe original reactants employed by Dutch chemist Hendrik Jacobus Prins in his 1919 publication were styrene ( scheme 2 ), pinene, camphene, eugenol, isosafrole and anethole. In 1937 the reaction was investigated as part of a… …   Wikipedia

• Homologation reaction — A homologation reaction, also known as homologization, is any chemical reaction that effects an overall increase of the carbon skeleton of a saturated reactant molecule. [ Encyclopedia of Inorganic Chemistry DOI|10.1002/0470862106.id396] The… …   Wikipedia

• Bingel reaction — The Bingel reaction in fullerene chemistry is a fullerene cyclopropanation reaction to a methanofullerene first discovered by C. Bingel in 1993 with the bromo derivative of diethyl malonate in the presence of a base such as sodium hydride or DBU… …   Wikipedia

• Glucose — This article is about the naturally occurring D form of glucose. For the L form, see L Glucose. D glucose …   Wikipedia

• Baldwin's rules — 42(24), 3846 (1977). doi|10.1021/jo00444a011] .The rules classify ring closures in three ways:*the number of atoms in new ring formed *into exo and endo ring closures, depending whether the bond broken during the ring closure is inside (endo) or… …   Wikipedia

• Regioselectivity — In chemistry, regioselectivity is the preference of one direction of chemical bond making or breaking over all other possible directions [JerryMarch] [http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch06/ch6 0 1.html Regioselectivity… …   Wikipedia

• inosinicase — An enzyme that functions in purine biosynthesis and catalyzes the ring closure reaction that produces inosinic acid from 5′ phosphoribosyl 5 formamidoimidazole 4 carboxamide …   Medical dictionary