Catalytic hydrogenation of sulfolenes

Details Catalytic hydrogenation of sulfolenes Catalytic hydrogenation of sulfolenes

Filed on

1985-03-29

Date issued

1985-12-10

Examiner

Siegel, Alan

Patent Class

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

SubClass

Organic compounds

SubSubClass

Heterocyclic carbon compounds containing a hetero ring...

Other Related Categories

C07D33348

Type

Patent

Status

active

Patent number

045581380

Description

ABSTRACT:
A sulfolene compound, especially 3-sulfolene, containing dissolved sulfur dioxide as impurity is contacted with an oxidizing agent selected from the group of (a) peroxomonosulfuric acid, (b) peroxodisulfuric acid, (c) peroxomonosulfates and an acid having a pKa less than 4, and (d) peroxodisulfates and an acid having a pKa of less than 4, so as to remove at least a portion of dissolved SO.sub.2. Preferred agents are KHSO.sub.5 and H.sub.2 SO.sub.4. The thus purified sulfolene compound, particularly 3-sulfolene, can be hydrogenated to a sulfolane compound over a suitable catalyst, e.g., Raney nickel.

REFERENCES:
patent: 3152144 (1964-10-01), Middlebrook
patent: 3417103 (1968-12-01), Warner
patent: 3514469 (1970-05-01), Phillips et al.
patent: 3622598 (1971-11-01), Willis
patent: 4188327 (1980-02-01), Kubicek
"Comprehensive Inorganic Chemistry", vol. 2, by J. C. Bailar et al., 1973, Pergamon Press, pp. 882, 883.

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