Matches in SemOpenAlex for { <https://semopenalex.org/work/W1996764903> ?p ?o ?g. }
Showing items 1 to 91 of
91
with 100 items per page.
- W1996764903 endingPage "3163" @default.
- W1996764903 startingPage "3155" @default.
- W1996764903 abstract "A two-step synthetic approach to penta- and hexahelicenes substituted at the terminal aromatic rings has been studied. This approach is based on the Diels–Alder reaction of 5,5′,8,8′-tetramethyl-3,3′,4,4′-tetrahydro-[1,1′]-binaphthalene (2b), 3-vinyl-1,2-dihydronaphthalene (5a), 5,8-dimethyl-3-vinyl-1,2-dihydronaphthalene (5b) and 3-vinyl-1,2-dihydrophenanthrene (15) followed by the aromatization of the cycloadducts. This method is flexible, efficient and of wide application to the synthesis of several benzenoid and nonbenzenoid penta- and hexahelicenes. The racemization energy barriers of helicenes 3, 9, 10, 13, 14, 17 and 18 were computed with the semiempirical quantum method AM1. The computed values show that, when methyl groups are introduced at the inner position of the terminal aromatic rings, the racemization barriers increase markedly. A structure analysis of the reaction products by 1H- and 13C-NMR spectroscopy is also presented." @default.
- W1996764903 created "2016-06-24" @default.
- W1996764903 creator A5001983808 @default.
- W1996764903 creator A5034285581 @default.
- W1996764903 creator A5054923636 @default.
- W1996764903 creator A5059562766 @default.
- W1996764903 creator A5076946926 @default.
- W1996764903 date "1999-11-01" @default.
- W1996764903 modified "2023-10-16" @default.
- W1996764903 title "An Efficient Synthetic Approach to Substituted Penta- and Hexahelicenes" @default.
- W1996764903 cites W10698245 @default.
- W1996764903 cites W1979046104 @default.
- W1996764903 cites W1984743010 @default.
- W1996764903 cites W1993174917 @default.
- W1996764903 cites W2001746553 @default.
- W1996764903 cites W2003741550 @default.
- W1996764903 cites W2004620410 @default.
- W1996764903 cites W2012206068 @default.
- W1996764903 cites W2013726323 @default.
- W1996764903 cites W2015805721 @default.
- W1996764903 cites W2017378995 @default.
- W1996764903 cites W2031980030 @default.
- W1996764903 cites W2036098447 @default.
- W1996764903 cites W2039778042 @default.
- W1996764903 cites W2050435642 @default.
- W1996764903 cites W2060143120 @default.
- W1996764903 cites W2069186479 @default.
- W1996764903 cites W2090361975 @default.
- W1996764903 cites W2092923062 @default.
- W1996764903 cites W2106545984 @default.
- W1996764903 cites W2131124255 @default.
- W1996764903 cites W2169251938 @default.
- W1996764903 cites W2171724749 @default.
- W1996764903 cites W2198205683 @default.
- W1996764903 cites W2278836485 @default.
- W1996764903 cites W2326448569 @default.
- W1996764903 cites W4211185038 @default.
- W1996764903 doi "https://doi.org/10.1002/(sici)1099-0690(199911)1999:11<3155::aid-ejoc3155>3.0.co;2-s" @default.
- W1996764903 hasPublicationYear "1999" @default.
- W1996764903 type Work @default.
- W1996764903 sameAs 1996764903 @default.
- W1996764903 citedByCount "42" @default.
- W1996764903 countsByYear W19967649032012 @default.
- W1996764903 countsByYear W19967649032013 @default.
- W1996764903 countsByYear W19967649032014 @default.
- W1996764903 countsByYear W19967649032018 @default.
- W1996764903 countsByYear W19967649032020 @default.
- W1996764903 countsByYear W19967649032022 @default.
- W1996764903 crossrefType "journal-article" @default.
- W1996764903 hasAuthorship W1996764903A5001983808 @default.
- W1996764903 hasAuthorship W1996764903A5034285581 @default.
- W1996764903 hasAuthorship W1996764903A5054923636 @default.
- W1996764903 hasAuthorship W1996764903A5059562766 @default.
- W1996764903 hasAuthorship W1996764903A5076946926 @default.
- W1996764903 hasConcept C147597530 @default.
- W1996764903 hasConcept C161790260 @default.
- W1996764903 hasConcept C178790620 @default.
- W1996764903 hasConcept C185592680 @default.
- W1996764903 hasConcept C2779325354 @default.
- W1996764903 hasConcept C60002323 @default.
- W1996764903 hasConcept C66974803 @default.
- W1996764903 hasConcept C71240020 @default.
- W1996764903 hasConceptScore W1996764903C147597530 @default.
- W1996764903 hasConceptScore W1996764903C161790260 @default.
- W1996764903 hasConceptScore W1996764903C178790620 @default.
- W1996764903 hasConceptScore W1996764903C185592680 @default.
- W1996764903 hasConceptScore W1996764903C2779325354 @default.
- W1996764903 hasConceptScore W1996764903C60002323 @default.
- W1996764903 hasConceptScore W1996764903C66974803 @default.
- W1996764903 hasConceptScore W1996764903C71240020 @default.
- W1996764903 hasIssue "11" @default.
- W1996764903 hasLocation W19967649031 @default.
- W1996764903 hasOpenAccess W1996764903 @default.
- W1996764903 hasPrimaryLocation W19967649031 @default.
- W1996764903 hasRelatedWork W1996764903 @default.
- W1996764903 hasRelatedWork W1997327214 @default.
- W1996764903 hasRelatedWork W2022399555 @default.
- W1996764903 hasRelatedWork W2049434445 @default.
- W1996764903 hasRelatedWork W2132206446 @default.
- W1996764903 hasRelatedWork W2949676535 @default.
- W1996764903 hasRelatedWork W2950384969 @default.
- W1996764903 hasRelatedWork W2950386412 @default.
- W1996764903 hasRelatedWork W2950530731 @default.
- W1996764903 hasRelatedWork W2951469888 @default.
- W1996764903 hasVolume "1999" @default.
- W1996764903 isParatext "false" @default.
- W1996764903 isRetracted "false" @default.
- W1996764903 magId "1996764903" @default.
- W1996764903 workType "article" @default.