JOC 65,8.2000 - 2348 - Lot's a thanks to
ning who retrieved the article!
Reaction of Phenol with H2O2 catalyzed by Cis-Cu.cis-Bisglycinato copper(II) monohydrate (50mg, 0.225 mmol), phenol (473mg, 5.32 mmol), and H2O2 (1ml, 30%)
were mixed together in a flask and stirred at room temperature. The white paste obtained slowly turned brown, and
the color intensified with time. After 24h of continuous stirring, the reaction mixture was washed
several times with petroleum ether (4 x 20ml) to obtain a paste, and this paste was washed with water (1ml) and dried
in evacuated desiccator to obtain a black solid (0,24g).
Reaction of o-Cresol. Similar reaction of o-cresol
(540 mg, 5 mmol) with H2O2 (1ml 30%) and cis-Bisglycinato copper(II) monohydrate (50 mg, 0,225 mmol) gave
2,5-dihydroxytoluene in 98% yield
o-cresol from phenol, HCOH and Ca(OH)
2:
Patent US2401608
preparation of cis-Bisglycinato copper(II) monohydrate1. Weigh, to the nearest 0.01 g, 4g of copper (II) acetate monohydrate and place in a 250 ml flask. Add 40 ml of H2O and heat, with stirring, until the salt completely dissolves.
2. Keeping the solution warm, add 40 ml of hot 95% ethanol to the flask.
3. Weigh out 3 g of glycine and place in a 50 ml beaker. Add 40 ml H2O and heat until dissolution occurs.
4. Add the hot glycine solution to the hot copper solution and swirl.
5. Cool the flask in an ice bath until the product precipitates.
6. Collect the product using a Büchner funnel. The filtrate may be used to rinse out any product remaining in the flask.
7. Wash the product once with approximately 60 ml of 95% ethanol.
8. Suction dry the product for a few minutes, then put on a watch glass and dry in an oven at about 50ºC for 40 minutes.
9. Weigh the final, dry product and place in a pre-weighed vial (with cap).
Ref:
http://wwwchem.uwimona.edu.jm%3A1104/lab_manuals/c31lex1.html
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