POLYMER—SUPPORTED SINGLE AND MIXED AMMONIUM AND PHOSPHONIUM SALTS AS CATALYSTS FOR PHASE—TRANSFER REACTIONS

(整期优先)网络出版时间:2001-02-12
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Inthisstudywastoinvestigate,byphase-transfercatalysis,theactivityofsingleandmixedammoniumandphosphoniumsaltsgraftedona"gel-type"styrene-7%pinylbenzenecopolymerintheoxidationofbenzylalcoholwithhydrogenperoxide.Awidevarietyofcatalystswithdifferentquaternarygroupsanddifferentquaternarychainlengthsubstituentswereexamined.Theactivityofsingle"onium"saltsincreasesasaconsequenceoftheassociationofammoniumandphosphoniumsaltsgraftedonthesamepolymericsupport.Theactivityofpolymer-supportedammoniumandphosphoniumsaltsincreaseswiththenumberofcarbonatomscontainedinthealkylradicalsofthe-oniumandofthefunctionalizationdegreewithphosphoniumgroups.