Oxidation products of paramethyl-substituted hindered phenols

Details Oxidation products of paramethyl-substituted hindered phenols Oxidation products of paramethyl-substituted hindered phenols

1986-11-04

1990-04-10

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Cyclohexadiene having atoms double bonded directly at the 1-...

2604105, 558335, 558339, 558340, 560 8, 560106, 560186, 560188, 560221, 560254, 564389, 568430, 568432, 568435, 568607, 568644, 568662, 568764, 568774, C07C 4106, C07C 4538, C07C 4602, C07C 5030, C07C 6704, C07C 6916

Patent

active

049158759

ABSTRACT:
Paramethyl-substituted hindered phenols are selectively oxidized by contacting with an oxidizing agent at elevated temperatures in the presence of a heterogeneous oxidative coupling catalyst. In the absence of an optional nucleophile the products comprise carbon-carbon oxidative coupling products. In the presence of a nucleophile, addition products result that may be further oxidized by continued exposure to the oxidizing agent to yield substituted p-hydroxybenzaldehydes.

REFERENCES:
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patent: 4119671 (1978-10-01), Bauer et al.
patent: 4429163 (1984-01-01), Nishizawa et al.
Filar, Tetrahedron Letters, No. 25, pp. 9-16, 1960.
Cook et al., "Oxidation of Hindered Phenols", pp. 3797-3799, (1956).
Balogh et al., J. Org. Chem., 36(10), pp. 1339-1341, 1971.
Macomber, J. Org. Chem., 47, pp. 2481-2483, (1982).
Olmura, J. Org. Chem., 49, pp. 3046-3050, (1984).

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