Modern Friedel-Crafts chemistry. Part-29. Cyclialkylation of some triphenylated propane, butane and pentane substrates to diphenylated indans under Friedel-Crafts conditions

Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt E-mail: khalafal@anu.edu.eg Manuscript received 9 January 2007, revised 5 November 2007, accepted 26 November 2007 Reactions under Friedel-Crafts cyclialkylation conditions produced : isomeric 1,2-diphcnylindans from 1,2,3- triphcnyl-(1- or 2-)propanol and 1-chloro-2,3,3-triphcnylpropane, trans-2-bcnzyl-1-phenylindan from 2-benzyl-1,3-diphenyl· 2-propanol, isomeric 1-methyl-1,2-diphcnylindans from 2,3,4-triphenyl-2-butanol, 1,1-dimethyl-3,4-diphcnylindan from 2-methyl-3,4,4-triphcnyl-2-butanol, and isomeric 1-ethyl-1,3-diphcnylindans from 1,1,3-triphenyl-3-pentanol. Mechanistic interpretations and product identifications arc offered