Sulfate Ion → HCID 86741743, compound

HRID 1789330Notes

Reaction equation

[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[OH:6][C@H:7]1[O:14][C@@H:13]2[CH2:15][O:16][C@@H:10]([C@H:11]2[OH:12])[C@H:8]1O>>[S:1]([O:5][C@H:8]([C@H:10]1[O:16][CH2:15][C@@H:13]([OH:14])[C@@H:11]1[OH:12])[CH:7]=[O:6])([OH:4])(=[O:3])=[O:2]

Participants

Reactant 2

HCID 1117Sulfate Ion

HCID 13037720HCID 13037720, compound

Product 1

HCID 86741743HCID 86741743, compound

Procedure

Carrageenans having a moleculr weight of from 100.000 to 800.000 Dalton are known; approximately 25% sulfate-content; various types: kappa-carrageenan: comprised of alternating 1,3 or 1,6, respectively, linked 3,6-anhydro-α-D-galactose and D-galactose-4-sulfate; gel-forming; only partially oxidizable lambda carrageenan: α-1,3-glycosidically linked D-galactose-2(4)-sulfate residues and 1,4-linked D-galactose-2,6-disulfate residues and 1,4-linked-D-galactose-2,6-disulfate residues; does not gel; and still partially oxidizable at C-6: i-carrageenan: from D-galactose-4-sulfate formed in 1,3-linkage and 3,6-anhydro-D-galactose-2-sulfate formed in 1,4-linkage; forms gel with Ca2+.

Workup

customgel-forming

Sources & evidence

ORD record: ord-eea5d259ce154d80a3a765c17b71a210
Source dataset: uspto-grants-1987_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04689322

Reaction notes

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