Molar extinction coefficients for the far ultraviolet absorption of cyclobutene, 1-methylcyclobutene, and methylenecyclobutane were measured between 40 000 cm—1 and 64 000 cm—1. These spectra show the characteristic absorption of π electrons with oscillator strengths of 0.3 and with band positions which are explicable on the basis of molecular structure. Photodecomposition to give ethylene was observed in the case of methylenecyclobutane and 1-methylcyclobutene.
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Loeffler et al. (1958) studied this question.