FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2093962621> ?p ?o ?g. }

• W2093962621 endingPage "555" @default.
• W2093962621 startingPage "545" @default.
• W2093962621 abstract "Abstract Substitution of the phenyl group in 2‐hydroxychalcones by a 4‐pyridine unit dramatically changes the network of chemical reactions of this compound: trans ‐chalcone‐type ( Ct ), cis ‐chalcone‐type ( Cc ), and a hemiketal (hydroxy‐4‐pyridinechromene) ( B ) and their protonated forms are formed, but the presence of a flavylium‐type cation could not be detected even at very acidic pH values. Moreover, whereas in 2‐phenyl‐2‐benzopyrylium compounds B and Cc are generally elusive species whose kinetic processes in aqueous solutions occur on the sub‐second timescale, in the present compound these species equilibrate on a timescale four orders of magnitude lower. Complete characterization of the equilibrium and kinetics of the reaction network could thus be achieved by 1 H NMR spectroscopy and UV/Vis spectrophotometry. The network of chemical reactions exhibits cis – trans photoisomerization, as well as photochromism between the hemiketal and the chalcone‐type species. The irradiation of Ct in MeOH/H 2 O (1:1) at 365 nm produces B almost quantitatively through two consecutive photochemical reactions: Ct → Cc photoisomerization followed by Cc → B photo ring closure with a global quantum yield of 0.02. On the other hand, irradiation of B at 254 nm leads to a photostationary state composed by 80 % Ct and 20 % B , with a quantum yield of 0.21." @default.
• W2093962621 created "2016-06-24" @default.
• W2093962621 creator A5017821254 @default.
• W2093962621 creator A5050319862 @default.
• W2093962621 creator A5087861336 @default.
• W2093962621 date "2009-12-28" @default.
• W2093962621 modified "2023-10-18" @default.
• W2093962621 title "Hydroxypyridinechromene and Pyridinechalcone: Two Coupled Photochromic Systems" @default.
• W2093962621 cites W1965554479 @default.
• W2093962621 cites W1966638831 @default.
• W2093962621 cites W1969572284 @default.
• W2093962621 cites W1972155932 @default.
• W2093962621 cites W1973314832 @default.
• W2093962621 cites W1973605908 @default.
• W2093962621 cites W1973892244 @default.
• W2093962621 cites W1976546482 @default.
• W2093962621 cites W1984523847 @default.
• W2093962621 cites W1984936931 @default.
• W2093962621 cites W1990565692 @default.
• W2093962621 cites W1992608985 @default.
• W2093962621 cites W1992925079 @default.
• W2093962621 cites W1994694051 @default.
• W2093962621 cites W1996400848 @default.
• W2093962621 cites W1996818423 @default.
• W2093962621 cites W2002019120 @default.
• W2093962621 cites W2011434404 @default.
• W2093962621 cites W2012202826 @default.
• W2093962621 cites W2017408612 @default.
• W2093962621 cites W2017710660 @default.
• W2093962621 cites W2020596724 @default.
• W2093962621 cites W2022953676 @default.
• W2093962621 cites W2026716256 @default.
• W2093962621 cites W2027184062 @default.
• W2093962621 cites W2028776546 @default.
• W2093962621 cites W2029204613 @default.
• W2093962621 cites W2035000532 @default.
• W2093962621 cites W2038738311 @default.
• W2093962621 cites W2042951368 @default.
• W2093962621 cites W2045205152 @default.
• W2093962621 cites W2045970108 @default.
• W2093962621 cites W2049246166 @default.
• W2093962621 cites W2053036921 @default.
• W2093962621 cites W2053363861 @default.
• W2093962621 cites W2058896010 @default.
• W2093962621 cites W2066131188 @default.
• W2093962621 cites W2068352516 @default.
• W2093962621 cites W2070605378 @default.
• W2093962621 cites W2071481697 @default.
• W2093962621 cites W2072900207 @default.
• W2093962621 cites W2081296345 @default.
• W2093962621 cites W2081425008 @default.
• W2093962621 cites W2090314065 @default.
• W2093962621 cites W2091364349 @default.
• W2093962621 cites W2093003561 @default.
• W2093962621 cites W2098205015 @default.
• W2093962621 cites W2113920575 @default.
• W2093962621 cites W2131536169 @default.
• W2093962621 cites W2136287154 @default.
• W2093962621 cites W2155919734 @default.
• W2093962621 cites W2156108763 @default.
• W2093962621 cites W2159215382 @default.
• W2093962621 cites W2267891332 @default.
• W2093962621 cites W2324692696 @default.
• W2093962621 cites W2331368120 @default.
• W2093962621 cites W2339013633 @default.
• W2093962621 cites W2949876262 @default.
• W2093962621 cites W2950157165 @default.
• W2093962621 doi "https://doi.org/10.1002/chem.200901884" @default.
• W2093962621 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19918818" @default.
• W2093962621 hasPublicationYear "2009" @default.
• W2093962621 type Work @default.
• W2093962621 sameAs 2093962621 @default.
• W2093962621 citedByCount "18" @default.
• W2093962621 countsByYear W20939626212012 @default.
• W2093962621 countsByYear W20939626212013 @default.
• W2093962621 countsByYear W20939626212014 @default.
• W2093962621 countsByYear W20939626212015 @default.
• W2093962621 countsByYear W20939626212016 @default.
• W2093962621 countsByYear W20939626212017 @default.
• W2093962621 countsByYear W20939626212019 @default.
• W2093962621 countsByYear W20939626212020 @default.
• W2093962621 countsByYear W20939626212023 @default.
• W2093962621 crossrefType "journal-article" @default.
• W2093962621 hasAuthorship W2093962621A5017821254 @default.
• W2093962621 hasAuthorship W2093962621A5050319862 @default.
• W2093962621 hasAuthorship W2093962621A5087861336 @default.
• W2093962621 hasConcept C121332964 @default.
• W2093962621 hasConcept C126661725 @default.
• W2093962621 hasConcept C134121241 @default.
• W2093962621 hasConcept C145148216 @default.
• W2093962621 hasConcept C161790260 @default.
• W2093962621 hasConcept C171001562 @default.
• W2093962621 hasConcept C178790620 @default.
• W2093962621 hasConcept C185592680 @default.
• W2093962621 hasConcept C191897082 @default.
• W2093962621 hasConcept C192562407 @default.
• W2093962621 hasConcept C2780764945 @default.
• W2093962621 hasConcept C30095370 @default.

• next