blocking group

blocking group

[′bläk·iŋ ‚grüp]
(organic chemistry)
In peptide synthesis, a group that is reacted with a free amino or carboxyl group on an amino acid to prevent its taking part in subsequent formation of peptide bonds.
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Polyrotaxane polymers are blends in which linear polymer chains pass through cyclic polymer structures and cannot be disconnected because of blocking groups.
The paint contains an ingredient with marine biocide properties, wherein the binder comprises a blend of the rosin material and an auxiliary film-forming resin in a ratio of 20:80 to 95:5 by weight, the auxiliary film-forming resin comprising 20-100% by weight of an acid-functional film-forming polymer whose acid groups are blocked by groups capable of hydrolyzing or dissociating to leave a polymer soluble in sea water, the blocking groups being selected from divalent metal atoms bonded to a monovalent organic residue, divalent metal atoms bonded to a hydroxyl residue and monoamine groups which form an organic solvent soluble amine salt of the polymer, and 80% to zero percent by weight of a non-hydrolyzing water-insoluble film-forming polymer.
At the same time, the offense practices against a variety of blocking groups.