The Effects of Media on the Intramolecular Photocycloaddition of 3-(3-Butenyl)cyclohex-2-enone

In this work, we applied the 1D nutation NMR method for the analysis of the local structural environments in powdered borosilicates . Spin dynamics during a rf irradiation for spin I=3/2 was analytically calculated with a density ma trix formalism. Spectral simulation programs were written in MATLAB on a PC. Two borosilicates prepared by the sol-gel process at different stabilization temperature were used for the 1D nutation NMR experiment. The NMR parameters, quadrupole coupling constants and asymmetry parameters (η), for each borosilicate were extracted from the nonlinear least-squares fitting. The effects of heat treatments on the local structures of boron sites in borosilicates were discussed.