cyclization


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cyclization

[‚sī·klə′zā·shən]
(organic chemistry)
Changing an open-chain hydrocarbon to a closed ring.
References in periodicals archive ?
Although we observed near complete consensus in the cyclization sequence at each terminus between these 4 viruses, FRV had higher levels of identity to SEPV and WESSV than YFV across the respective upstream AUG regions.
1], its intensity also decreased with the dose increasing of irradiation, it demonstrated that the cyclization reaction occurred in PAN precursors after irradiation.
Although peroxyl radical 43 is easily converted to hydroperoxide 44, there is no evidence that the former undergoes cyclization to form dioxetanyl derivatives 47 and 48, because aldehydic products expected from the decomposition of the latter two have not been reported.
Structurally, there is a restriction in maleic anhydride imposed by cis double bond preventing the bonding through a single -COOH group; instead a cyclization product is obtained.
It can be seen that with the increase of temperature, the content of most cycloalkanes increased, indicating that the cyclization reaction was accelerated at higher temperatures.
The absence of carbon and ferric carbide in the solid phase show that lower paraffin hydrocarbons and, chiefly, methane without subjecting to the degradation with the formation of hydrogen and carbon can take part in the chemical addition reactions and cyclization of hydrocarbons.
From a single digest and run, users can gain identity and purity information with 100% coverage in a peptide map; heterogeneity information with ultra-sensitive glycopeptide quantification; and stability information identifying, deamidation, cyclization and oxidation.
ABSTRACT: A copper metal complex has been synthesized by condensation and cyclization methodology.
The following step is a classical diazo moiety forming cyclization at low temperature to generate the benzoicjcinnolines.
Included are stereoselective oxidation and reduction methods; stereoselective additions; cyclizations; metatheses and different types of rearrangements; asymmetric transition-metal-catalyzed, organocatalyzed, and biocatalytic reactions; methods for the formation of carbon-heteroatom and heteroatom-heteroatom bonds like asymmetric hydroamination and reduction amination, carboamination and alkylative cyclization, cycloadditions with carbon-heteroatom bond formation, and stereoselective halogenations; and methods for the formation of carbon-sulfur and carbon-phosphorus bonds and asymmetric sulfoxidation.
The probable reason for the failure may be the steric hindrance posed by bulky isobenzofuran component for cyclization pathway.
1a] standard can be explained by the cyclization that occurs during TEGDMA polymerization.