Copper-Catalysed Allylic Substitution Using 2,8,14,20-Tetrapentylresorcinarenyl-Substituted Imidazolium Salts
Tarih
2015Yazar
Kaloglu, MuratSahin, Neslihan
Semeril, David
Brenner, Eric
Matt, Dominique
Ozdemir, Ismail
Kaya, Cemal
Toupet, Loic
Üst veri
Tüm öğe kaydını gösterÖzet
Unsymmetrical imidazolium salts, each having one nitrogen atom (N1) substituted by a cavity-shaped TPR group (TPR = 2,8,14,20-tetrapentylresorcinaren-5-yl), were tested in situ as proligands for the copper-catalysed allylic arylation of cinnamyl bromide with arylmagnesium halides. The catalytic systems produced mixtures of linear (l) and branched (b) arylated compounds in variable proportions, with the b/l ratio being the highest (78:22) for the most crowded imidazolium salt used, namely that in which the second nitrogen atom (N2) was substituted by a mesityl group. An N-heterocyclic carbene complex obtained from one of the imidazolium salts was characterised by an X-ray diffraction study.
Kaynak
EUROPEAN JOURNAL OF ORGANIC CHEMISTRYSayı
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