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1 INTRODUCTIONCyclenderivativescontainingfourneutralpendentgroupsareeffectiveligandsforlanthanideandtransitionmetalions〔1~4〕.TheycanbeusedascatalystsforRNAtransesterification〔5〕orforcleavageofphosphateesters〔6〕orphosphoricanhydride〔7〕.Someofthemhaveb… 相似文献
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