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DOI: 10.1055/s-0030-1260788
Preparation and Reactivity of Polystyrene-Supported Iodosylbenzene: Convenient Recyclable Oxidizing Reagent and Catalyst
Publication History
Publication Date:
15 June 2011 (online)
Abstract
A facile preparation of novel polystyrene-supported iodosylbenzene (PS-ISB, loading of IO up to 1.50 mmol/g) from iodopolystyrene is described. This resin has been successfully used for efficient oxidation of a diverse collection of alcohols to aldehydes and ketones in the presence of BF3˙OEt2. PS-ISB can also be employed as efficient co-catalyst in combination with RuCl3 in the catalytic oxidation of alcohols and aromatic hydrocarbons, respectively, to corresponding carboxylic acids and ketones using Oxone as the stoichiometric oxidant.
Key words
polymers - iodine - oxidation - iodosylbenzene - recyclable reagent
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References and Notes
Preparation of PS-ISB (2) PS-DIB (1,7 1.430 g, 3.0 mmol) and NaOH (0.400 g, 10.0 mmol) were grinded intensively in a mortar at r.t. for 10 min. The resulting mixture was left to stay at r.t. for 2 h, then H2O (15 mL) was added and stirred overnight, the mixture was filtered, washed with H2O (3 × 3 mL), acetone (3 × 3 mL), and Et2O (3 × 3 mL) subsequently, and then dried in vacuum to give a yellow powder (1.05 g). Elem. Anal. (%): O, 8.68; I, 37.19. IR (KBr): ν = 761 (I=O) cm-¹.
10
General Procedure
for Oxidations Using PS-ISB (2)
To
a vigorously stirred suspension of PS-ISB (2,
0.3 mmol) in CH2Cl2 (2 mL), BF3˙OEt2 (0.040
mL) was added, and the resulting mixture was stirred at r.t. for
15 min. To the mixture, the appropriate alcohol (0.2 mmol) or Ph3P
(0.2 mmol) or anthracene (0.1 mmol) was added. The resulting mixture
was stirred at r.t. for the indicated time (Table
[¹]
). A portion of the crude
reaction mixture (100 µL) was poured into a flask with
Et2O (0.5 mL) to precipitate PS-IB, then the mixture
was passed through a 2-3 cm of silica gel suspended in
a Pasteur pipette, and the resulting solution was analyzed by GC-MS
to determine the conversion of organic substrates.
Typical Procedure of the PS-ISB/RuCl 3 -Cocatalyzed Oxidation of Alcohols Oxone (0.92 g, 1.5 mmol) was added to a mixture of 1-phenylethanol (122 mg, 1 mmol, Table [²] , entry 7), PS-ISB (2, 0.070 g, 0.1 mmol, 10 mol%), and RuCl3 (10 µL of 0.20 M solution in H2O, 0.002 mmol, 0.2 mol%) in MeCN (3 mL) and H2O (3 mL) in one portions under stirring at r.t. (the reaction was monitored by TLC by the disappearance of 1-phenylethanol). Then EtOAc (15 mL) and H2O (20 mL) were added, and the mixture was stirred for 5 min. The polymeric catalyst (PS-ISB) was filtered, washed with H2O (2 × 2 mL) and EtOAc (2 × 2 mL), and collected for next run. The organic solution was separated, and the aqueous phase and extracted with EtOAc (2 × 15 mL). The organic solutions were combined, washed with NaCl (sat. solution, 20 mL), and dried over anhyd Na2SO4. Removal of the solvent under vacuum afforded acetophenone (114 mg, 95%). The oxidation of other alcohols and hydrocarbons (Table [²] ) was performed by using a similar procedure.