. Ml, The reaction mixture was placed at 80 °C for 3 days. The desired product was obtained as a yellow oil (11.8 g, 98% yield) 1 H NMR (500 MHz, trimethoxysilyl)propyl isocyanate (10.3 g, 9.6 mL CDCl 3 , 298 K): ? 0.47 (d, J = 8.6 Hz, 4H, CH 2 CH 2 Si), 1.44 (m, 4H, CH 2 CH 2 Si), 2.98 (m, 4H, CH 2 CH 2 NHCO), 3.39 (s, 18H, SiOCH 3 ), 4.47 (s, 4H, CH=CHCH 2 O), 5.53 (m, 2H, CH=CH) (Figure S9). 13 C{ 1 H} NMR (125 MHzCH 2 CH 2 Si), 43.2 (CH 2 CH 2 NHCO)OCONH) (Figure S10). ESI-HRMS: [M+Na] + (C 18 H 32 N 2 O 10 NaSi 2 ) calcd (g.mol ?1 )Figure S11). FTIR (cm ?1 ), pp.521-521, 1963.

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