AN IMPROVED SYNTHESIS OF 1,2,3,4,5-PENTAMETHYLCYCLOPENTADIENE

Article abstract of DOI:10.1016/0022-328X(83)80228-9

An inexpensive three-step synthesis for large-scale preparation of 1,2,3,4,5-pentamethylcyclopentadiene is reported.Improvement of Burger's route involving 2,3,5,6-tetrahydro-2,3,5,6-tetramethyl-γ-pyrone and 2,3,4,5,-tetramethylcyclopent-2-enone raised the overall yield to about 34percent of the desired compound (originally 8percent).