Acetals useful for the preparation of polysaccharide derivatives

Details Acetals useful for the preparation of polysaccharide derivatives Acetals useful for the preparation of polysaccharide derivatives

1987-04-10

1989-02-14

Rollins, John W.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31906

Patent

active

048047694

ABSTRACT:
Polysaccharide aldehydes having the formula Sacch-O-CH.sub.2 -CH.dbd.CH-CHO, Sacch-O-CH.sub.2 -C.tbd.C-CHO, ##STR1## such as starch, cellulose, and gum aldehydes, are useful for imparting wet, dry, or temporary wet strength to paper. They are prepared by a non-oxidative method which involves reacting the polysaccharide base, in the presence of alkali, with a derivatizing acetal reagent having the general structure ##STR2## and then hydrolyzing the acetal by adjusting the pH to less than 7, preferably 2-4. In the formulas, n is 1-3; R.sup.11 and R.sup.12 are independently an alkyl, aryl, aralkyl, or alkaryl group when n is 1, R.sup.11 or R.sup.12 is one of the groups when n is 2, or R.sup.11 and R.sup.12 are not present when n is 3; R.sup.13 is an alkyl group, optionally containing an ether linkage, or an aralkyl group; R.sup.14 and R.sup.15 are individually a hydrogen or a methyl group; R.sup.16, R.sup.17, and R.sup.18 are individually an alkyl group; Y.sup.- is an anion; Z is an organic group capable of reacting with the polysaccharide base to form an ether derivative and selected from the group consisting of an epoxide, ethylenically unsaturated group, halohydrin, and halogen; R.sup.19, if present, is a divalent organic group containing no reactive substiuents; and A and A' are lower alkyls or together form at least a 5-membered cyclic acetal.

REFERENCES:
patent: 2698937 (1955-01-01), Staerkle et al.
patent: 3519618 (1970-07-01), Parmerter
patent: 4048435 (1977-09-01), Rutenberg et al.
patent: 4276414 (1981-06-01), Tessler

Affiliated with

Also associated with

Rating

Acetals useful for the preparation of polysaccharide derivatives does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Acetals useful for the preparation of polysaccharide derivatives, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acetals useful for the preparation of polysaccharide derivatives will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1366730