The reaction of 1-arylpropenyl-lithium (1a–c) with t-alkylbromides proceeds by either a nucleophilic substitution or single electron transfer mechanism, the preferred pathway being a function of electronicsubstituenteffects and the absence or presence of tetramethylethylenediamine or hexamethylphosphoramide.
Reaction of phenyl-substituted allyllithiums with tert-alkyl bromides. Remarkable difference in the alkylation regiochemistry between a polar process and the one involving single-electron transfer
Un chemin reactionnel polaire favorise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Un chemin reactnel polaire favourise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Muraoka, Kiyoshige; Nojima, Masatomo; Kusabayashi, Shigekazu, Journal of the Chemical Society. Perkin transactions II, 1986, p. 761 - 768
Synthesis of Neolignan Ocimin and Analogues by Titanium Mediated Coupling of Methoxycinnamyl Alcohols
作者:M. Gaxiola、G. V. Rodríguez、M. Parra-Hake、R. Somanathan
DOI:10.1080/00397919808004450
日期:1998.9
Coupling of Methoxycinnamyl alcohols to form Ocimin, and its 1,6-bisdiaryl-(E)-(E)- hexa-1,5-diene analogues was effected using McMurry reagents TiCl3/Zn-Cu or TiCl3/LiAlH4. Linear and branched products were obtained with ratios depending on the Titanium reagent used.
MURAOKA, KIYOSHIGE;NOJIMA, MASATOMO;KUSABAYASHI, SHIGEKAZU;NAGASE, SHIGER+, J. CHEM. SOC. PERKIN TRANS., 1986, N 5, 761-767