In organic chemistry, an electrocyclic reaction is a type of pericyclic rearrangement where the net result is one pi bond being converted into one sigma...

wanted to know whether certain electrocyclic reactions might help synthesize vitamin B12. Chemists knew that such reactions exhibited striking stereospecificity...

that twist is not possible and the reaction is not allowed. An electrocyclic reaction is a pericyclic reaction involving the net loss of a pi bond and...

An electrocyclic reaction can either be classified as conrotatory or disrotatory based on the rotation at each end of the molecule. In conrotatory mode...

the ring reforms electrocyclically: This same mechanistic process is seen below, without the final electrocyclic ring-closing reaction, in the interconversion...

precorrin-8x to hydrogenobyrinic acid non-enzymatic, photochemical electrocyclic ring opening and a (1,7) sigmatropic hydride shift in vitamin D synthesis...

organic reactions are electrocyclic reactions, radical reactions, photoisomerization, and Norrish reactions. Alkenes undergo many important reactions that...

process in cascade transformations, pericyclic reactions include cycloadditions, electrocyclic reactions and sigmatropic rearrangements. Although some...

result of this reaction. Reactions of conjugated double-bond systems can be synthesized into cycloalkenes through electrocyclic reactions. Addition of heat...

the reaction mechanism involves a cationic 4π-electrocyclic ring closure which forms the cyclopentenone product (See Mechanism below). As the reaction has...

637–647 Woodward, R.B.; Hoffmann, R. (1965). "Stereochemistry of Electrocyclic Reactions". Journal of the American Chemical Society. 87 (2): 395–397. doi:10...

second step, with an electrocyclic reaction opening the cyclopropane ring to form the 7-membered ring. The Buchner ring expansion reaction was first used in...

Ehrlich–Sachs reaction Einhorn variant Einhorn–Brunner reaction Elbs persulfate oxidation Elbs reaction Electrochemical fluorination Electrocyclic reaction Electrophilic...

the epidermal layer of skin, 7-dehydrocholesterol undergoes an electrocyclic reaction as a result of UVB light at wavelengths between 290 and 310 nm,...

their high thermodynamic stability. They operate by means of a 6-pi electrocyclic reaction, the thermal analog of which is impossible due to steric hindrance...

ketene-imine cycloaddition Dyotropic reaction Electrocyclic reaction Group transfer reaction Sigmatropic reaction Polymerization Ring-opening metathesis...

photolyzed by ultraviolet light in a 6-electron conrotatory ring-opening electrocyclic reaction; the product is previtamin D3. Second, previtamin D3 spontaneously...

ring-opening via an electrocyclic reaction (at least formally) to give the allene. Several different mechanisms for the electrocyclic rearrangement have...

compound instead first undergoes a tautomerization followed by an electrocyclic reaction to give the same intermediate, which then similarly undergoes a...

2-furyl carbinols. It was proposed by Piancatelli that the reaction is a thermal electrocyclic reaction of a conrotatory 4π electron system while studying specifics...

photochemically driven electrocyclic ring-closure of hexa-2,4-diene, which proceeds in a disrotatory fashion. Organic reactions that obey these rules are...

1021/ja00536a069. Kikuchi O. (1981). "A classification of the photochemical electrocyclic reactions of heteroatom conjugated systems". Tetrahedron Lett. 22 (9): 859–862...

hexaphenylbenzene. The adjacent pairs of benzene rings undergo oxidative electrocyclic reactions and aromatization by oxidation by iron(III) chloride in nitromethane...

Torquoselectivity is a special kind of stereoselectivity observed in electrocyclic reactions in organic chemistry, defined as "the preference for inward or...

Woodward, R. B.; Hoffmann, Roald (1965). "Stereochemistry of electrocyclic reactions". J. Am. Chem. Soc. 87: 395–397. doi:10.1021/ja01080a054. Longuet-Higgins...

molecular orbital control of stereochemistry in organometallic electrocyclic reactions". Journal of the Chemical Society, Chemical Communications (1):...

3-thiazepine in a 4-electron electrocyclic ring opening and then to a 7-thia-2-azanorcaradiene in a 6-electron electrocyclic ring, closing before extruding...

"A Claim on the Development of the Frontier Orbital Explanation Electrocyclic Reactions". Angewandte Chemie International Edition. 43 (48): 6586–6590....

isomer, the E isomer can also undergo a photochemically-induced electrocyclic reaction, forming a new ring and becoming a distinctly colored product called...

first to produce a zwitterionic oxyallyl cation before a disrotatory electrocyclic ring closure takes place to afford the cyclopropanone intermediate....