Cis and trans isomers of disilenes: photochemical and thermal interconversions

MJ Michalczyk, R West, J Michl

Index: Fink, Mark J.; Haller, Kenneth,J.; West, Robert; Michl, Josef Journal of the American Chemical Society, 1984 , vol. 106, # 3 p. 822

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Citation Number: 55

Abstract

Compound 2a gives a 29Si NMR signal at+ 90.3 ppm, even more deshielded than the+ 63.6 ppm resonance for 1. It exhibits UV maxima at-400 (sh) and 338 nm (Figure 1). Irradiation at 350 nm leads to a photostationary equilibrium mixture containing 63% of 2a and 37% of the cis isomer, 2b. 5 The isomerization can easily be followed by'H or