Macromolecular salen catalyst with largely enhanced catalytic activity

Organic Letters

Volumn 10, Issue 2, 2008, Pages 241-244

  Striegler, Susanne ^a,b   Gichinga, Moses G ^a   Dittel, Michael ^b  

^a AUBURN UNIVERSITY   (United States)

^b UNIVERSITY OF ULM   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

COPPER; ETHYLENEDIAMINE DERIVATIVE; N,N' DISALICYLIDENEETHYLENEDIAMINE; UNCLASSIFIED DRUG;

ARTICLE; CATALYSIS; CHEMICAL STRUCTURE; CHEMISTRY; OXIDATION REDUCTION REACTION;

CATALYSIS; COPPER; ETHYLENEDIAMINES; MODELS, MOLECULAR; MOLECULAR STRUCTURE; OXIDATION-REDUCTION;

EID: 38749130126     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol702672k     Document Type: Article

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27. Control reactions were performed (a) without oxygen and (b) without copper(II) complex. While the oxidation was completely inhibited in a sealed cuvette containing degassed, nitrogen-purged methanol, slow spontaneous oxidation of 3,5-DTBC to 3,5-DTBQ was observed in the presence of oxygen. The rate constant was determined from spectral data collected over a 1 h period.
28. Typical procedure for emulsion polymerization: Poly(acrylate) beads were prepared by mixing of 3 g of butyl acrylate and 3 g of styrene in 500 mg of decane with 48 mL of water containing 144 mg of sodium dodecyl sulfate (SDS). Ligand 2 (144 mg, 0.26 mmol) dissolved in 1 g of DMSO was then added and the resulting mixture was stirred vigourously for 1 h followed by sonication for 2 min. The polymerization was initiated by addition of aqueous potassium peroxysulfate at 72 °C and allowed to proceed for 3 h. The polymer particles obtained were purified by ultracentrifugation using micropore filters with a 10 000 MW cutoff. A sample aliquot of the aqueous polymer solution was dried for elemental analysis.
29. The kinetic experiments were conducted after addition of appropriate amounts of aqueous copper(II) acetate solution to prepare a 0.09 mM aqueous catalyst stock solution that was subsequently diluted into methanol to yield a final 1.5 μM concentration of catalyst pol3a.