658711-27-4 1,3,5,7-Tetraoxa-2,4,6-trisila-8-boracyclooctane,8-(3-methoxyphenyl)-2,2,4,4,6,6-hexamethyl- 658711-32-1 1,3,5,7-Tetraoxa-2,4,6-trisila-8-boracyclooctane,8-butyl-2,2,4,4,6,6-hexamethyl- 105890-85-5 1,3,5,7-Tetraoxa-2,4,6-trisila-8-germacyclooctane,8,8-dichloro-2,2,6,6-tetrakis(1,1-dimethylethyl)-4,4-dimethyl-