Bromo-PEG4-azide linker contains a bromide group and an azide group. The PEG spacer increases the aqueous solubility of the resulting compound. The azide group can react with alkyne, BCN, DBCO via Click Chemistry to yield a stable triazole linkage. Bromo (Br) is a very good leaving group for nucleophilic substitution reactions. It can also be applied for cysteine redidue labelling.
AxisPharm offers 4000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.