A new polyaniline-based catalyst for the oxidation of alkenes

Synlett

Volumn , Issue 12, 2002, Pages 2107-2109

  Kowalski, Grzegorz ^a   Pielichowski, Jan ^a  

^a CRACOW UNIVERSITY OF TECHNOLOGY   (Poland)

Author keywords

Alkenes; Catalysts; Conjugated polymers; Oxidation; Polyaniline based catalysts

Indexed keywords

2 METHYLANILINE; ALKENE DERIVATIVE; POLYANILINE;

ARTICLE; ATMOSPHERIC PRESSURE; CATALYST; CHEMICAL REACTION; OXIDATION; ROOM TEMPERATURE;

EID: 0036456059     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2002-35566     Document Type: Article

References (22)

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16. Method of Synthesis of Co(II)Salen: In 50 mL of 95% boiling EtOH 4.9 g (40 mmol) of salicylaldehyde was dissolved. To this solution 1.2 g (20 mmol) of ethylenediamine was added dropwise. The reaction was stirred for 3.5 h. After completion, the reaction mixture was cooled. N,N′-Bis(salicylidene)ethylenediimine yellow crystals were precipitated, filtered out, washed with 20 mL of EtOH and finally dried. Subsequently, 2 g (7.45 mmol) of Schiff base was dissolved in 120 mL of EtOH. The reaction was carried out under argon atmosphere. The cobalt(II) acetate 1.85 g (8.37 mmol) solution in 15 mL of warm water (60°C) was added dropwise. A brown-red gelatinous product was formed, which next changed to red crystals. The reaction was stirred for 1 h. After cooling, the crystals of Co(II)Salen complex were filtered and dried at 60°C (under vacuum) overnight.
17. 3 solution for 6 h. Deprotonated polymer was dried at 60°C for 24 h and washed again with water and MeOH. All these purification steps are important for the entire removal of all oligomeric species accompanying the polymer.
18. (a) Preparation of Polyaniline Supported Cobalt(II) Acetate is Representative for the Procedure Employed for Cobalt(II) Acetate Based Catalysts: A mixture of polyaniline (500 mg) and cobalt acetate (500 mg) was stirred in an MeCN (25 mL) and HOAc (25 mL) mixture for 72 h at r.t. Then the reaction mixture was filtered and the solid catalyst was washed with MeCN (5 × 5 mL). The catalyst was dried at 110°C for 24 h.
19. (b) Preparation of Polyaniline Supported Co(II)Salen is Representative for the Procedure Employed for Co(II)Salen Based Catalysts: A mixture of polyaniline (500 mg) and Co(II)Salen (500 mg) was stirred in 50 mL of MeCN for 48 h at r.t. The reaction mixture was filtered and the solid catalyst was stirred again with 50 mL of HOAc for 1 h at r.t. The reaction mixture was filtered and the solid filtrate was first washed with HOAc (3 × 10 mL) and then MeCN (5 × 5 mL). The catalyst was dried at 110°C for 24 h.
20. 4 and the evaporation of solvent yielded the desired product, which was purified by Kugelrohr distillation.
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