T 2158 (OTTO) 2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, 95% Cas 2554-06-5 - used as an intermediate in organic synthesis. T 2158 (OTTO) 2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, 95% Cas 2554-06-5 - used in the preparation of 4-vinyl-benzoic acid ethyl ester. T 2158 (OTTO) 2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, 95% Cas 2554-06-5 - used to prepare styrene derivatives by cross-coupling with aryl bromide in the presence of palladium catalyst.