Matches in SemOpenAlex for { <https://semopenalex.org/work/W1974533201> ?p ?o ?g. }
Showing items 1 to 96 of
96
with 100 items per page.
- W1974533201 endingPage "6966" @default.
- W1974533201 startingPage "6951" @default.
- W1974533201 abstract "The titled cation 4 has been synthesized and its properties and chemical reactivities investigated in detail. The cation 4 was shown to be formed in high yields not only by hydride abstraction from but also by the action of halogenoacetic acids upon the cycloheptatriene derivative 6. Based on the results of UV-Vis and NMR spectroscopies together with iodometric analysis, this reaction was shown to proceed via protonation of 6 followed by dehydrogenation with molecular oxygen. The cation 4 was also shown to be formed by the action of rather weak Brønsted acids such as H3PO4, H2CO3, H3BO3, C6H5OH, and CH3NO2 upon the 7-methoxycycloheptatriene 10. These facts are in agreement with the extraordinarily high thermodynamic stability of 4 as is shown by its pKR+ value, 13.0 (50% aqueous CH3CN, 25°C). The cation 4 does not show any reactivity towards the nucleophiles with the pKa of conjugate acid smaller than 10.3 except for the case of a slow reaction with CN− (pKa(NuH) 9.21). Also 4 does not react with the carbanions R− with pKa(RH) below 8.3, such as the tris(7H-dibenzo[c,g]fluorenylidenemethyl)methyl anion (Kuhn's anion, C67H39-) and the 9-cyanofluorenyl anion, and a new hydrocarbon salt, 4·C67H39-, was isolated. In contrast, the reaction of 4 with the carbanions R− with pKa(RH) larger than 11, such as dicyanomethyl, α-cyano-p- nitrobenzyl, 1,1-dicyanoethyl, and dibenzo[c,g]fluorenyl anions, afforded the covalent compounds 4-R. Whereas the compound 4-R (as represented by the case of R=dibenzo[c,g]fluorenyl) only regenerated the cation 4 upon treatment with the trityl cation, the 7-methylcycloheptatriene 13 afforded the fully substituted cation 14, which was found to be rather destabilized (pKR + 12.4) as compared with the hexasubstituted cation 4." @default.
- W1974533201 created "2016-06-24" @default.
- W1974533201 creator A5001230144 @default.
- W1974533201 creator A5023297489 @default.
- W1974533201 creator A5044056742 @default.
- W1974533201 creator A5057446098 @default.
- W1974533201 creator A5076857222 @default.
- W1974533201 creator A5086749142 @default.
- W1974533201 date "1991-08-01" @default.
- W1974533201 modified "2023-10-06" @default.
- W1974533201 title "Formation, properties, and reactions of the 1,2:3,4:5,6-tris(bicyclo[2.2.2]octeno)tropylium ion" @default.
- W1974533201 cites W1568044442 @default.
- W1974533201 cites W1971474997 @default.
- W1974533201 cites W1976246360 @default.
- W1974533201 cites W1992298164 @default.
- W1974533201 cites W2002270917 @default.
- W1974533201 cites W2005721103 @default.
- W1974533201 cites W2007406919 @default.
- W1974533201 cites W2017487211 @default.
- W1974533201 cites W2024229415 @default.
- W1974533201 cites W2052762590 @default.
- W1974533201 cites W2055868384 @default.
- W1974533201 cites W2069556934 @default.
- W1974533201 cites W2072489652 @default.
- W1974533201 cites W2078921032 @default.
- W1974533201 cites W2083337669 @default.
- W1974533201 cites W2330304021 @default.
- W1974533201 cites W2950897887 @default.
- W1974533201 cites W2952193952 @default.
- W1974533201 cites W3005271704 @default.
- W1974533201 cites W4245924049 @default.
- W1974533201 doi "https://doi.org/10.1016/s0040-4020(01)96150-2" @default.
- W1974533201 hasPublicationYear "1991" @default.
- W1974533201 type Work @default.
- W1974533201 sameAs 1974533201 @default.
- W1974533201 citedByCount "29" @default.
- W1974533201 countsByYear W19745332012014 @default.
- W1974533201 countsByYear W19745332012016 @default.
- W1974533201 crossrefType "journal-article" @default.
- W1974533201 hasAuthorship W1974533201A5001230144 @default.
- W1974533201 hasAuthorship W1974533201A5023297489 @default.
- W1974533201 hasAuthorship W1974533201A5044056742 @default.
- W1974533201 hasAuthorship W1974533201A5057446098 @default.
- W1974533201 hasAuthorship W1974533201A5076857222 @default.
- W1974533201 hasAuthorship W1974533201A5086749142 @default.
- W1974533201 hasConcept C142724271 @default.
- W1974533201 hasConcept C145148216 @default.
- W1974533201 hasConcept C155647269 @default.
- W1974533201 hasConcept C161790260 @default.
- W1974533201 hasConcept C178790620 @default.
- W1974533201 hasConcept C178907741 @default.
- W1974533201 hasConcept C185592680 @default.
- W1974533201 hasConcept C204787440 @default.
- W1974533201 hasConcept C20774148 @default.
- W1974533201 hasConcept C24961977 @default.
- W1974533201 hasConcept C2776793192 @default.
- W1974533201 hasConcept C2776910235 @default.
- W1974533201 hasConcept C30095370 @default.
- W1974533201 hasConcept C71924100 @default.
- W1974533201 hasConcept C82894169 @default.
- W1974533201 hasConceptScore W1974533201C142724271 @default.
- W1974533201 hasConceptScore W1974533201C145148216 @default.
- W1974533201 hasConceptScore W1974533201C155647269 @default.
- W1974533201 hasConceptScore W1974533201C161790260 @default.
- W1974533201 hasConceptScore W1974533201C178790620 @default.
- W1974533201 hasConceptScore W1974533201C178907741 @default.
- W1974533201 hasConceptScore W1974533201C185592680 @default.
- W1974533201 hasConceptScore W1974533201C204787440 @default.
- W1974533201 hasConceptScore W1974533201C20774148 @default.
- W1974533201 hasConceptScore W1974533201C24961977 @default.
- W1974533201 hasConceptScore W1974533201C2776793192 @default.
- W1974533201 hasConceptScore W1974533201C2776910235 @default.
- W1974533201 hasConceptScore W1974533201C30095370 @default.
- W1974533201 hasConceptScore W1974533201C71924100 @default.
- W1974533201 hasConceptScore W1974533201C82894169 @default.
- W1974533201 hasIssue "34" @default.
- W1974533201 hasLocation W19745332011 @default.
- W1974533201 hasOpenAccess W1974533201 @default.
- W1974533201 hasPrimaryLocation W19745332011 @default.
- W1974533201 hasRelatedWork W2059042954 @default.
- W1974533201 hasRelatedWork W2064211345 @default.
- W1974533201 hasRelatedWork W2136084156 @default.
- W1974533201 hasRelatedWork W2143258611 @default.
- W1974533201 hasRelatedWork W2409854391 @default.
- W1974533201 hasRelatedWork W2950145531 @default.
- W1974533201 hasRelatedWork W2953244698 @default.
- W1974533201 hasRelatedWork W3140252606 @default.
- W1974533201 hasRelatedWork W4246348712 @default.
- W1974533201 hasRelatedWork W3146339533 @default.
- W1974533201 hasVolume "47" @default.
- W1974533201 isParatext "false" @default.
- W1974533201 isRetracted "false" @default.
- W1974533201 magId "1974533201" @default.
- W1974533201 workType "article" @default.