Process for the preparation of alkyl 3-chlorosulfonylthiophene-2

Details Process for the preparation of alkyl 3-chlorosulfonylthiophene-2 Process for the preparation of alkyl 3-chlorosulfonylthiophene-2

1985-03-07

1988-08-02

Terapane, John F.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D33332, C07D33334

Patent

active

H00005045

ABSTRACT:
A process for preparation of chlorosulfonyl thiophene compounds comprising contacting a thiophenamine with sodium or potassium nitrite to produce a diazonium salt, then contacting said salt with sulfur dioxide and cuprous or cupric chloride, or bromide. Addition of gaseous HCl, concentrated H.sub.2 SO.sub.4, or oleum to the diazotization mixture enhances yield.

REFERENCES:
patent: 2623050 (1952-12-01), Graenacher et al.
patent: 2653927 (1953-09-01), Graenacher et al.
Chemische Berichte, vol. 90 (1957) pp. 841-852, Meerwein et al.
The Chemistry of Heterocyclic Compounds, pp. 228-235, "Thiophene and its Derivatives".
Huddleston et al., J. Chem. Research, 1980, pp. 238-239.
Hentschel et al., J. Prakt. Chemie. 316, 5, 1974, pp. 878-880.
Bull. Soc. Chem. Fra., 1925, pp. 1437-1438.

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