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Retraction: An Efficient Synthesis of Poly(ethylene glycol)‐Supported Iron(II) Porphyrin using a Click Reaction and its Application for the Catalytic Olefination of Aldehydes
Author(s) -
Jain Suman L.,
Joseph Jomy K.,
Kühn Fritz E.,
Reiser Oliver
Publication year - 2009
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200800361
Subject(s) - chemistry , catalysis , ethylene glycol , alkyne , triphenylphosphine , click chemistry , azide , peg ratio , porphyrin , combinatorial chemistry , cycloaddition , olefin fiber , polymer chemistry , ethylene , organic chemistry , finance , economics
The first successful synthesis of poly(ethylene glycol) (PEG) immobilized iron(II) porphyrin using a copper‐catalyzed azide‐alkyne [3+2] cycloaddition is reported. In contrast to the existing methods for the synthesis of PEG‐immobilized metalloporphyrins, the click method offers better catalyst loading under comparatively mild reaction conditions. The prepared complex 5 (PEG‐C 51 H 39 FeN 7 O) was found to be an efficient catalyst for the selective olefination of aldehydes with ethyl diazoacetate in the presence of triphenylphosphine and afforded excellent olefin yields with high ( E ) selectivities. The PEG‐supported catalyst 5 was readily recovered by precipitation and filtration and was recycled for up to ten runs without significant loss of activity.