Photo rapid setting

The addition of halogens, e.g., bromine, to Xe matrices is a refinement of the technique for photo-chemically inducing reactions of vibrationally excited electronic ground-state molecules, which has been developed in the last few years. Thus, 1-methylcyclopropene (6) was found to be stable towards light of 248, 254, or 313 nm in Ar matrices but was photolyzed by 313 nm light in Brj-doped Xe matrices (Scheme 3). The stable products were identified by their IR absorptions as buta-l,3-diene (8) and methylallene (9), but an additional set of IR bands was also observed in the product spectra. These absorptions decreased in intensity rapidly on subsequent irradiation at 313 or 366 nm, while the absorptions of 6, 8, and 9... 

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