The Di-π-methane Photorearrangement of 2,3-Disubstituted Benzobarrelenes and Benzonorbornadiene − Substituent Effects in Regioselectivity
Yükleniyor...
Tarih
2002
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley-V C H Verlag Gmbh
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
2,3-Disubstituted benzobarrelene and benzonorbornadiene derivatives 16, 17, and 18, containing electron-withdrawing and electron-donating substituents, have been synthesized and subjected to triplet-sensitized photoisomerization. Methyl 3-methyl-2-benzobarrelenecarboxylate (16) gave two di-pi-methane rearrangement products. However, methyl 3-cyano-2-benzobarrelenecarboxyidte (17) underwent an intramolecular [2(pi) + 2(pi)] cycloaddition reaction, whilst methyl 3cyano-2-benzonorbornadienecarboxylate (18) formed dimer 40. The formation of these products is discussed in terms of the radical stabilizing effect of the substituents and the destabitizing effect on the formation of cyclopropane ring.
Açıklama
UZUN, ORHAN/0000-0001-7586-9075; Dastan, Arif/0000-0002-9577-2251
Anahtar Kelimeler
benzobarrelene, benzonorbornadiene, di-pi-methane rearrangement, photolysis
Kaynak
European Journal Of Organic Chemistry
WoS Q Değeri
Q2
Scopus Q Değeri
Cilt
2002
Sayı
3
Künye
closedAccess
