US PATENT SUBCLASS 554 / 96
.~.~.~.~ Carbon bonded directly to -S(=O)(=O)OH or to -O-S(=O)(=O)OH, wherein H may be replaced by a cation or by an ester forming group (e.g., sulfonic acid sulfate monoester, etc.)


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554 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ Fatty compounds having an acid moiety which contains the carbonyl of a carboxylic acid, salt, ester, or amide group bonded directly to one end of an acyclic chain of at least seven (7) uninterrupted carbons, wherein any additional carbonyl in the acid moiety is (1) part of an aldehyde or ketone group, (2) bonded directly to a noncarbon atom which is between the additional carbonyl and the chain, or (3) attached indirectly to the chain via ionic bonding {23}
85  DF  .~.~ Sulfur containing {4}
88  DF  .~.~.~ Sulfoxy containing (e.g., sulfones, etc.) {5}
96.~.~.~.~ Carbon bonded directly to -S(=O)(=O)OH or to -O-S(=O)(=O)OH, wherein H may be replaced by a cation or by an ester forming group (e.g., sulfonic acid sulfate monoester, etc.) {4}
97  DF  .~.~.~.~.~> Metal salt
98  DF  .~.~.~.~.~> Processes utilizing anhydrous sulfur trioxide (e.g., in gaseous form, in sulfur dioxide solution, etc.)
99  DF  .~.~.~.~.~> Processes of sulfonating in the presence of lower carboxylic acid, anhydride, acid halide, or phosphorus containing material
100  DF  .~.~.~.~.~> Purification or recovery


DEFINITION

Classification: 554/96

(under subclass 88) Compounds which contain a sulfonic acid or a sulfate monoester substituent, or a salt or ester of the substituent.