Spacers heterobifunctional 98% Boc-NH-PEG5-CH2COOH

Boc-NH-PEG5-CH2COOH is characterized by Spacers heterobifunctional. At the same time, the purity of the product can reach 98%，By providing high-quality products,it works simultaneously production research and development.

Take one of the artificial NH2-PEG-NH and dissolve it in a very fifteen milliliter, 0.1 malefactor NaHCO3 solution. Then take 0.103g of dissolved in thirty milliliters of dioxane answer, slowly drip into the above-named NH-PEG-NH2 NaHCO3 solution beneath associate degree ice bathtub. When the dripping is completed, the Boc-PEG is stirred and reacted at temperature for eighteen when the reaction is terminated, alter the pH scale of the answer to 7~8 with dilute acid, and take away the solvent by rotary evaporation. The residual solid is dissolved in chloride and filtered. The filtrate is precipitated with ether, washed, and dried in vacuo to get light-weight yellow Boc-PEG-NH the yield is almost ninetieth.