Information om | Engelska ordet ELECTROCYCLIZATION

Exempel på hur man kan använda ELECTROCYCLIZATION i en mening

• After the 6π electrocyclization of the Z form to the "close-ring" form, most unsubstituted diarylethenes are prone to oxidation, leading to a re-aromatization of the π-system.
• The resulting conjugated species 7 equilibrated to conformer 8, which more readily underwent an 8π-conrotatory electrocyclization to the highly strained intermediate 9.
• Further mechanistic studies conclude that this is not a concerted transformation, but rather an initial alkyne hydroarylation followed by a series of non-obvious intramolecular rearrangements, concluding with a 6π electrocyclization and rearomatization.
• The dienylketene then undergoes a six-electron electrocyclization to give a hexadienone intermediate which rapidly tautomerizes to yield a highly substituted phenol or naphthol structures.
• Percec has made scientific contributions in diverse areas, including the discovery of all helical stereoisomers of polyphenylacetylene, their interconversion and intramolecular electrocyclization with applications in chiral separation, sensors, membranes, molecular machines, the discovery of liquid crystals based on conformational isomerism: polyethers, poly(vinyl ether)s, macrocyclics, covalent and supramolecular dendrimers He revealed double-helices disregarding chirality and deracemization in crystal state, designed the sequence-rearrangement concept to transform dynamic racemic (atactic) into homochiral (isotactic) supramolecular polymers and demonstrated acceleration of self-assembly and disassembly by fluorine and fluorous phase.
• The major difference is that the cyclopropanone intermediate is replaced by a cyclobutanone intermediate, and therefore the intermediate's formation cannot be viewed as a 2-electron electrocyclization reaction.

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