[6+ 2] Cycloadditions catalyzed by titanium complexes

…, H Antropiusová, L Petrusová, V Hanuš, F Tureček…

Index: Mach, Karel; Antropiusova, Helena; Petrusova, Lidmila; Hanus, Vladimir; Turecek, Frantisek; Sedmera, Petr Tetrahedron, 1984 , vol. 40, # 17 p. 3295 - 3302

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Citation Number: 56

Abstract

The Ziegler catalyst TiCl4-Et2AlCl and the arenetitanium (II) complex (η6-C6H6) Ti (II)(AlCl4) 2 induce [6+ 2] cycloaddition reactions of cycloheptatriene with dienes and acetylenes. Addition to 1, 3-butadiene affords 7-endo-vinyl-bicyclo [4.2. 1] nona-2, 4-diene (main product) and bicyclo [4.4. 1]-undeca-2, 4, 8-triene, a product of [6+ 4] cycloaddition. Isoprene reacts similarly, yielding mainly 7-endo-isopropenyl-bicyclo [4.2. 1] nona-2, 4-diene. 2, 3- ...