2-Bromo-4-nitroimidazole
26
1,3-Propanesultone
27
3-hydroxy-1-propane sulfonic acid
27
Diethylene glycol di(p-toluenesulfonate)
27
1,2-Bis[2-(p-toluenesulfonyloxy)ethoxy]ethane
27
Tetraethylene glycol di-p-tosylate
27
Diethyl trichloroMethylphosphonate
28
diethyl (chloromethyl)phosphonate
28
Bromomethyl-phosphonic acid diethyl ester
28