Substituted and crosslinked glucans, process and intermediates for preparing them and use thereof

Claim 2

A substituted and crosslinked glucan in which from 10 to 100% of the 2 position carbon atoms of the anhydroglucoside unit carry a substituent of formula: ##STR2## where R 1 is (a) hydrogen; (b) phenyl or 1-6 C alkyl; or (c) substituted phenyl or substituted 1-6 C alkyl, substituted by hydroxy, 1-3 C alkoxy, mercapto, 1-3 C alkylmercapto, carboxy, phenyl or hydroxyphenyl; and R 2 is a covalent bond, phenylene, 1-3 C alkylene or 1-3 C alkylene substituted by hydroxy or phenyl; and from 10 to 100% of the primary hydroxy groups on 6 position are crosslinked by means of a compound of formula X--(CH.sub.2).sub.n --CHY--CH.sub.2 Z (II) where X is halogen; Y is halogen, or together with Z, oxygen; Z is OH, SH, or together with Y, oxygen; and n is 1, 2, 3, 4, 5 or 6.

Claim 3

A method for removal or recovery of metal ions by chelation from a solution, wherein a solution containing metal ions is contacted with a substituted and crosslinked glucan according to claim 1 above.

Claim 4

A process for preparing a substituted and crosslinked glucan, in which a glucan, wherein from 10 to 100% of the 2 position carbon atoms of the anhydroglucoside unit carry a primary amino group, is reacted with a compound of formula R.sub.1 --CO--R.sub.2 --COOH (I) where R 1 is (a) hydrogen; (b) phenyl or 1-6 C alkyl; or (c) substituted phenyl or substituted 1-6 C alkyl, substituted by hydroxy, 1-3 C alkoxy, mercapto, 1-3 C alkylmercapto, carboxy, phenyl or hydroxyphenyl; and R 2 is a covalent bond, phenylene, 1-3 C alkylene or 1-3C alkylene substituted by hydroxy or phenyl; the imine thus obtained is reduced, and finally from 10 to 100% of the primary hydroxy group on 6 position are crosslinked by treatment with a compound of formula X--(CH.sub.2).sub.n --CHY--CH.sub.2 Z (II) where X is halogen; Y is halogen, or together with Z, oxygen; Z is OH, SH, or together with Y, oxygen; and n is 1, 2, 3, 4, 5 or 6.

Claim 5

A process for preparing a substituted and crosslinked glucan, in which a glucan, wherein from 10 to 100% of the 2 position carbon atoms of the anhydroglucoside unit carry a primary amino group, is reacted with a compound of formula R.sub.1 --CO--R.sub.2 --COOH (I) where R 1 is (a) hydrogen; (b) phenyl or 1-6 C alkyl; or (c) substituted phenyl or substituted 1-6 C alkyl, substituted by hydroxy, 1-3 C alkoxy, mercapto, 1-3 C alkylmercapto, carboxy, phenyl or hydroxyphenyl; and R 2 is a covalent bond, phenylene, 1-3 C alkylene or 1-3C alkylene substituted by hydroxy or phenyl; the imine thus obtained is reduced, and finally from 10 to 100% of the primary hydroxy group on 6 position are crosslinked by treatment with a compound of formula X--(CH.sub.2).sub.n --CHY--CH.sub.2 Z (II) where X is halogen; Y is halogen, or together with Z, oxygen; Z is OH, SH, or together with Y, oxygen; and n is 1, 2, 3, 4, 5 or 6.

Claim 6

A substituted glucan in which from 10 to 100% of the 2 position carbon atoms of the anhydroglucoside unit carry a substituent of formula ##STR3## where R 1 is (a) hydrogen; (b) phenyl or 1-6 C alkyl; or (c) substituted phenyl or substituted 1-6 C alkyl, substituted by hydroxy, 1-3 C alkoxy, mercapto, 1-3 C alkylmercapto, carboxy, phenyl or hydroxyphenyl; and R 2 is a covalent bond, phenylene, 1-3 C alkylene or 1-3 C alkylene substituted by hydroxy or phenyl, provided, however, that R 2 is not a covalent bond when R 1 is hydrogen.

Claim 7

A substituted glucan in which from 10 to 100% of the 2 position carbon atoms of the anhydroglucoside unit carry a substituent of formula ##STR3## where R 1 is (a) hydrogen; (b) phenyl or 1-6 C alkyl; or (c) substituted phenyl or substituted 1-6 C alkyl, substituted by hydroxy, 1-3 C alkoxy, mercapto, 1-3 C alkylmercapto, carboxy, phenyl or hydroxyphenyl; and R 2 is a covalent bond, phenylene, 1-3 C alkylene or 1-3 C alkylene substituted by hydroxy or phenyl, provided, however, that R 2 is not a covalent bond when R 1 is hydrogen.