Process for preparing an intermediate useful in the syntheis of

Details Process for preparing an intermediate useful in the syntheis of Process for preparing an intermediate useful in the syntheis of

1991-07-19

1992-10-20

Cintins, Marianne M.

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

Organic compounds

Sulfur containing

562 74, 562833, C07C31902

Patent

active

051571560

ABSTRACT:
A process for preparing 2,6-di-t-butyl-4-mercapto-phenol. This is accomplished by sulfonation of the phenol with a silylated sulfonating agent (e.g., trimethylsilyl-chlorosulfonate). The sulfonic acid is then reduced directly or is converted to the sulfonyl halide intermediate which is then reduced to yield the 2,6-di-t-butyl-4-mercapto-phenol.

REFERENCES:
patent: 3673247 (1972-06-01), Hill, Jr. et al.
patent: 4056568 (1977-11-01), Cisneg
patent: 4625000 (1986-11-01), Chao et al.
Tetrahedron Letters, vol. 21, pp. 1235-1238, Pergamon Press GB 1980, "Direct Reduction of Sulfonic Acid to the . . . "(Numata).
Tetrahedron Letters, vol. 21, pp. 4921-2924, Pergamon . . . UK, (1980) "Iodine Catalyzed reduction of Arenesulfonic . . . " (Fujimori).
Bull. Chem. Soc. Jpn. 56, 3802-3812 (1983) vol. 56, No. 12 "Reduction of Sulfonic Acids and Related Organosulfur . . . " (OAE).
Voronkov, M. G. et al., "Synthesis", (1982) p. 277-280.

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