Combined DEFT 1D and INEPT DQF COSY 2D experiments in Si-29 NMR spectroscopy of alkoxysilane polymers .2. Applications of Si-29 NMR to polymerization reactions in dimethyldiethoxysilane

Polymerization reactions in dimethyldiethoxylsilane were studied using a new high-resolution Si-29 NMR method, This method is a combination of two polarization transfer experiments (DEFT) with a Si-29-Si-29 two-dimensional INEPT DQF COSY NMR experiment, The structures of oligomers were identified, including linear oligomers up to hexamers and cyclic oligomers with three, four or five silicon atoms, The distribution of species was determined from the intensities of resonance lines, giving some information on the polymerization pathways.