Process for production of methylene disulfonate compound

Details Process for production of methylene disulfonate compound Process for production of methylene disulfonate compound

2007-04-04

2010-11-09

Andres, Janet L (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S019000

Reexamination Certificate

active

07829730

ABSTRACT:
The present invention provides a process for producing a methylene disulfonate compound in a simple manner at low cost.The present invention provides a process for producing a methylene disulfonate compound represented by General Formula (2) comprising:reacting, in the presence of a dehydrating agent, a formaldehyde compound with a sulfonic acid compound represented by General Formula (1):wherein R1and R2are independently a hydrogen atom or a C1-4alkyl group whose hydrogen atom may be substituted with halogen atom; n is an integer from 1 to 4; and when n is an integer from 2 to 4, n R1s and n R2s may be the same or different:wherein, R1, R2, and n are the same as those described above for General Formula (1).

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Hcaplus 2005:1282975, “Preparation of disulfonic acid cyclic diesters”, Higo et. al., 2005.
International Search Report of PCT/JP2007/057599, date of mailing Jun. 19, 2007.

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