diethyl 7-bromoheptylphosphonate contains a bromine group and a phosphonic acid ethyl ester group. The bromine group is a good leaving group and easily undergoes substiution reactions. Phosphonic acid ethyl ester is used for surface modification. The hydrophilic PEG linker can increase the solubility of a compound in aqueous media and improve the hydrophilicity of the surfaces.
AxisPharm offers 4000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.