2-Vinylmethylenecyclopropane/3-Methylenecyclopentene Rearrangement: Matrix-Infrared Spectroscopic Identification of 4-Methylene-2-pentene-1,5-diyl (1,2‘-Bisallyl Diradical)

2-Vinylmethylenecyclopropane/3-Methylenecyclopentene Rearrangement: Matrix-Infrared Spectroscopic Identification of 4-Methylene-2-pentene-1,5-diyl (1,2‘-Bisallyl Diradical)