Inclusion complexes of cyclodextrins and strong inorganic oxy-acids and process for their preparation
AssigneeChinoin Gyogyszer es Vegyeszeti Termekek Gyara Rt.
InventorsJozsef Szejtli, Zsuzsanna Budai, Gabriella Pap nee Imrenyi, Andras Kerekes
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Abstract
Inclusion complexes of cyclodextrin and strong inorganic oxy acids are disclosed as well as a process for the preparation of the complexes. The complexes are useful for analytical purposes, internal buffering, introducing acids into anhydrous media, substitutions or introduction of radicals, or as catalysts.
Claims13
An inclusion complex of a cyclodextrin and a strong inorganic oxy-acid.
A process for the preparation of an inclusion complex of a cyclodextrin and a strong inorganic oxy-acid which comprises reacting a solid .alpha.-, .beta.- or .gamma.-cyclodextrin or a mixture of one of said cyclodextrins and a linear dextrin containing at least 60% by weight cyclodextrin while stirring with 0.25 to 4 ml (for each gram of cyclodextrin) of
- a 30 to 85% by weight aqueous phosphoric acid solution or
- a 30 to 75% by weight aqueous sulfuric acid solution or
- a 20 to 65% by weight aqueous nitric acid solution of a temperature between -5.degree. C. and +25.degree. C.
Dependencies are inferred from the claim text.