19064-90-5Relevant articles and documents
New reactivity of functionalised organolithium compounds in the presence of Cu(I) or Cu(II) salts: Conjugate addition, acylation or dimerisation
Pastor, Isidro M,Yus, Miguel
, p. 2371 - 2378 (2001)
The reaction of functionalised organolithium compounds 1 with electrophilic olefins 2 in the presence of copper(I) iodide and HMPA in THF at -78°C leads, after hydrolysis with a saturated solution of ammonium chloride, to the corresponding products 3 resulting from a conjugate addition. The same process but using an acyl chloride instead of the electrophilic olefins affords the expected ketone 4 from an acylation process. Finally, when intermediates 1 are treated with copper(II) chloride in THF at -78°C, the corresponding dimers 5 are isolated after the same hydrolytic treatment.
Copper(I) or (II)-mediated conjugate addition or dimerisation of functionalised organolithium compounds
Pastor, Isidro M.,Yus, Miguel
, p. 1589 - 1592 (2007/10/03)
The reaction of different functionalised organolithium intermediates 1- 3 with several electrophilic olefins 6 (2-cyclopentenone, 2-cyclohexenone, methyl vinyl ketone, benzylideneacetone, benzylideneacetophenone and ethyl acrylate) in the presence of copper(I) salts (bromide and iodide) in THF at -78°C gives, after hydrolysis with ammonium chloride, the expected products resulting from a conjugate addition. In the presence of copper(II) chloride intermediates 1-5 undergo dimerisation to yield the expected dimers. (C) 2000 Elsevier Science Ltd.
Selective Preparation of Polycyclic Aromatic Hydrocarbons. Part 7. A Preparative Route to 10,11-Dihydro-5H-dibenzo-cycloheptenes Using Friedel-Crafts Intramolecular Cyclobenzylation
Yamato, Takehiko,Sakaue, Naozumi,Komine, Masayasu,Nagano, Yoshiaki
, p. 1708 - 1735 (2007/10/03)
Cyclobenzylation of 2-hydroxymethyldiphenylethanes 4 and 2,2'-bis(hydroxymethyl)diphenylethanes 13 in the presence of a solid perfluorinated sulfonic acid resin, Nafion-H, as a catalyst results in novel polycyclic aromatic hydrocarbons, dibenzocyclopentenes.Dibenzocyclopentenes were also prepared from diphenylethanes by a benzylation reaction, which incorporates chloromethylation of a hydrocarbon followed by Friedel-Crafts intramolecular cyclization reaction.The present method involving the action of ClCH2OMe and TiCl4 on a variety of diphenylethanes (constructed such that electrophilic substitution occurs ortho to the diphenylethane linkage) offers a convenient, mild one-pot synthesis of substituted dibenzocycloheptenes.The mechanism of these reactions is also discussed.