pericyclic การใช้

• The pericyclic transitions states involving concerted synchronous or concerted asynchronous processes.
• The reaction proceeds via an pericyclic [ 1 + 4 ]-process.
• The second step of the Buchner reaction involves a pericyclic concerted ring expansion.
• Research on ene and retro-ene, also known as pericyclic reactions.
• The reaction proceeds via a cascade of four subsequent pericyclic reactions ( Scheme 3 ).
• In pericyclic reactions, explanation by orbital interactions give a better picture than simple discrete electron transfers.
• This prediction agrees with experiment as the Diels-Alder reaction is a rather facile pericyclic reaction.
• Calcium oxalate crystals and pericyclic fibers have been isolated from " D . thapsi ".
• Another example of the preference in the equilibrium within the area of pericyclic reaction is shown below.
• The following observations support the concerted pericyclic mechanism, and refute the stepwise diradical or the stepwise polar pathway.
• By the above rules, for a 4n electron pericyclic reaction of 2 components, there must be one antarafacial component.
• In the Dewar-Zimmerman analysis, one is concerned with the topology of the transition state in the pericyclic reaction.
• 1, 3-Dipolar cycloadditions are pericyclic reactions, which obey the Dewar-Zimmerman rules and the Woodward Hoffmann rules.
• The basic reaction types are : addition reactions, elimination reactions, substitution reactions, pericyclic reactions, rearrangement reactions and redox reactions.
• The stereochemistry of pericyclic reactions is governed by the Woodward Hoffmann rules and that of many elimination reactions by the Zaitsev's rule.
• A pericyclic reaction is one that involves a transition state with a cyclic array of atoms and an associated cyclic array of interacting orbitals.
• A [ ? 4 + ? 2 ] cycloaddition is a concerted 2-component pericyclic reaction exemplified by the Diels-Alder reaction.
• When ketenes are formed in the presence of alkynes they proceed through pericyclic reactions to generate a substituted aromatic ring ( Scheme 2 ).
• Cyclic rearrangements include cycloadditions and, more generally, pericyclic reactions, wherein two or more double bond-containing molecules form a cyclic molecule.