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Volumn 55, Issue 8, 1990, Pages 2478-2486

Intramolecular [4 + 2]-Cycloaddition Chemistry of Some 1,3-Dienyl-Substituted Cyclopropenes

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EID: 0011947021     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo00295a043     Document Type: Article
Times cited : (20)

References (125)
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    • Doering has shown that 2,5-diphenyl-l,5-heptadiene undergoes internal [2 + 2] thermal cycloaddition
    • See: ref 43
    • Doering has shown that 2,5-diphenyl-l,5-heptadiene undergoes internal [2 + 2] thermal cycloaddition. See: ref 43. Dewar, M.; Wade, L. E. J. Am. Chem. Soc. 1977, 99, 4419.
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    • Dewar, M.1    Wade, L.E.2
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    • Heating a sample of 2 produced 3 (30% yield) together with recovered starting material thereby suggesting an equilibration of both products under the thermal conditions employed
    • It should be noted that all attempts to detect the cis-vinyl-substituted alkene in the reaction mixture failed. Compound 4 was shown to be stable to the thermal conditions used and no isomerization of the exo-vinyl group to the endo isomer was detected
    • Heating a sample of 2 produced 3 (30% yield) together with recovered starting material thereby suggesting an equilibration of both products under the thermal conditions employed. The possibility also, exists that diradical intermediate 8 is directly involved in the cycloaddition of 1 to 2. However, this would require a prior isomerization about the trans double bond in cyclopropene 1. It should be noted that all attempts to detect the cis-vinyl-substituted alkene in the reaction mixture failed. Compound 4 was shown to be stable to the thermal conditions used and no isomerization of the exo-vinyl group to the endo isomer was detected.
    • The possibility also, exists that diradical intermediate 8 is directly involved in the cycloaddition of 1 to 2. However, this would require a prior isomerization about the trans double bond in cyclopropene 1
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    • It should be pointed out that the reaction of 9 could also occur by initial isomerization about the E double bond followed by a [2 + 2]-cycloaddition across the terminal jr-bond. This would result in the formation of cycloadduct i whose NMR properties would be very similar to structure 10
    • It should be pointed out that the reaction of 9 could also occur by initial isomerization about the E double bond followed by a [2 + 2]-cycloaddition across the terminal jr-bond. This would result in the formation of cycloadduct i whose NMR properties would be very similar to structure 10. NOE experiments are more consistent with 10 as the structure of the cycloadduct.
    • NOE experiments are more consistent with 10 as the structure of the cycloadduct
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.