“…29 Si NMR spectra of organomagnesiumoxane alumoxane siloxanes. In 1 Н,13 С NMR spectra of organomagnesiumoxane alumoxane siloxanes the following signals are recorded: 1 H-NMR (600.13 MHz, CDCl3) broad 0.7-1.5 ppm CH3 (С2H5O−); broad 1.5-2.4 ppm CH3 of acetoxy group; broad 3.5-4.5 ppm CH2 (С2H5O−); broad 4.5-5.6 ppm CH (CH=);13 С-NMR (600.13 MHz, CDCl3) broad 13-20 ppm CH3 (С2H5O−); broad 24-27 ppm CH3 of acetoxy group; broad 57-61 ppm CH2 (С2H5O−); broad 99-103 ppm CH (СH=); broad 170-175 ppm CO(O); broad 184-195 ppm C=O. The interpretation of the absorption bands of organomagnesiumoxane alumoxane siloxanes observed in the IR spectrum (Figure 6) is as follows: IR (cm −1 ), 595 ν(Mg−О−Al), 659, 688 ν(Mg−О; Al−О; Si−О), 863 ν(Al−О−Al), 940 ν(Mg−О), 967 ν(Al−О4; Si−О), 1030, 1071, 1101, 1176 ν(Mg−О−С; Al−О−С; Si−О−С), 787, 1268, 1291, 1303, 1398 δ{СН, C(CH3)} and ν(С-О), 1533 ν(С=С), 1602 ν(С=О from [CH3(O)CCH=C(CH3)О]), 1635 ν(С=О, bonded by coordination bond with Al atom), 2899, 2927, 2977 ν(СН), 3415 ν(ОH); it somewhat difficult due to the similarity of the spectra of the starting organoalumoxanes, (acac)2Mg and ethylsilicate-40.…”