... 4) T. Kametani, F. Satoh, H. Yagi, and K. Fukumoto, ]. ... caused a Hofrnann type elimination to give the known indene (28), mp 83——85O (lit.,7' 81—-82°), whose nuclear magnetic resonance (NMR) spectrum showed 5) T. Kametani and K. Fukumoto, Tetrahedvon Lettezs ...