[reaction: see text] A new poly(ethylene glycol)-supported porphyrin has been prepared and its ability as a promoter in photooxidation reactions has been studied. The PEG-supported catalyst exhibits high activity, comparable to that of a nonanchored sensitizer, and it is easily removable by filtration from the reaction mixture. The polymer-bound porphyrin has been recycled up to six times with no loss of chemical and stereochemical efficiency.

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Two new poly(ethylene glycol) supported manganese porphyrins have been prepared and their catalytic activity and recyclability were investigated for the epoxidation of alkenes using H2O2 and PhIO as stoichiometric oxidants.

Enantioselective synthesesEnantioselective syntheses O 0031 Immobilization of Catalysts Derived from Cinchona Alkaloids on Modified Poly(ethylene glycol). -(DANELLI, T.; ANNUNZIATA, R.; BENAGLIA*, M.; CINQUINI, M.; COZZI, F.; TOCCO, G.; Tetrahedron: Asymmetry 14 (2003) 4, 461-467; Dip. Chim. Org. Ind., Univ. Stud. Milano, CNR, I-20133 Milano, Italy; Eng.) -Nuesgen 25-040

Epoxidation Epoxidation O 0218 Synthesis of Poly(ethylene glycol)-Supported Manganese Porphyrins: Efficient, Recoverable and Recyclable Catalysts for Epoxidation of Alkenes. -Two new synthesized poly(ethylene glycol)-supported manganese porphyrins are used as effective catalysts for the epoxidation of alkenes. Good results are obtained in the presence of NMI as ligand using iodosobenzene or 30% aqueous H 2 O 2 as terminal oxidants. Only in the case of dodecene (VI), which is chosen as a model substance of poorly reactive compounds, low conversion is observed. -(BENAGLIA*, M.; DANELLI, T.; POZZI, G.; Org.

Photochemistry Photochemistry O 0160Poly (ethylene glycol)-Supported Tetrahydroxyphenyl Porphyrin: A Convenient, Recyclable Catalyst for Photooxidation Reactions. -The catalyst can be recycled up to 6 times with no loss of chemical and stereochemical efficiency. -(BENAGLIA*, M.; DANELLI, T.; FABRIS, F.; SPERANDIO, D.; POZZI, G.; Org. Lett. 4 (2002) 24, 4229-4232; Dip. Chim. Org. Ind., Univ. Stud. Milano, CNR, I-20133 Milano, Italy; Eng.) -Jannicke 15-055