6πe − versus 8πe − Electrocyclization of 1-Aryl- and Heteroaryl-Substituted (1 Z ,3 Z )-1,3,5-Hexatrienes: A Matter of Aromaticity †
✍ Scribed by García-Rubín, Silvia; Varela, Jesús A.; Castedo, Luis; Saá, Carlos
- Book ID
- 126925264
- Publisher
- American Chemical Society
- Year
- 2009
- Tongue
- English
- Weight
- 830 KB
- Volume
- 11
- Category
- Article
- ISSN
- 1523-7060
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1,6-Disubstituted (E,Z,E)-1,3,5-hexatrienes (4 and 5) were hex-1-ene (19) or by Wittig-Horner-Emmons olefination of 2bromocyclohexene-1-carbaldehyde ( 24) and subsequent prepared by vicinal twofold Heck coupling reactions from 1,2-dibromocyclopentene (1), 1,2-dibromocyclohexene (2), Heck reaction of