Synthesis of indenes from phenylpropanones using alumina catalystM, Jayamani and Nalin, Pant and S, Ananthan and K, Narayanan and C N, Pillai (1986) Synthesis of indenes from phenylpropanones using alumina catalyst. Tetrahedron , 42 (15). pp. 4325-4332.
Abstract1,3-Diphenylpronan-2-one undergoes dehydration over alumina at around 400° C to form 1,3-diphenylallene which cyclizes to 2-phenylindene. Since the parent ketone can be obtained under the reaction conditions from phenylacetic acid, the present reaction forms a one step syntheses of 2-phenylindene from phenylacetic acid. 3- and 4-methylphenylacetic acids also give the corresponding indenes. 1,3-Diphenylpropan-1-ones also give phenylindenes, presumably by a direct cyclodehydration reaction.
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