Abstract: 3-and 4-allyl-1,2-bis (β-hydroxyethoxy) benzene were synthesized from ethylene chlorohydrin and 3-or 4-allyleatechol, respectively. Reacting 3-aUyl-1,2-bis (hydroxyethoxy) benzene with diethylene glycol ditosylate or reacting 4-allyl-1, 2-(hydroxyethoxy) benzene with 1, 2-bis (hydroethoxy) benzene ditosylate, two benzo crown ethers, 3'-propenyl-2, 3-benzo-1, 4, 7, 10, 13, 16-hexaoxa-cyclooctadec-2-ene and 4'-propenyl-2, 3, 11, 12-dibenzo-1,4,7, 10, 13, 16-hexaoxa-cy-clooctadeca-2,11-diene,were obtained. The benzo crown ethers were subjected to hydrosilylation with trichlorosilane,followed by immobilization on silica, to give the title silica-bound benzo crown ethers.The silica-bound benzo crown ethers could coordinate with platinum. The both platinum complexes were found to be an effective catalyst for hydrosilylation of olefins with triethoxysflane.

Key words: crowns, organopolysiloxane, supported crown ether, platinum complex, hydrosilylation catalyst