C//-Methylene-insertion

The intensities of the Si-H stretching band ( 2080 cm ) and the Si-CH2-Si deformation band ( 1050 cm ) of the IR spectrum increase with an increase in pyrolysis temperature from 250 to 400 °C. Methylene insertion reactions are also suggested by changes in the CRAMPS, C MAS, and Si MAS NMR spectra. The observation of more than one distinct methylene carbon/proton resonance is consistent with the complicated chemistry of the system, wherein different reactions generate chemically distinct methylene environments. 

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