3-Mercaptopropionic acid (3-MPA) belongs to the family of mercaptans. 3-MPA is known for a long time and was already synthesized by Lovén [1] in 1884. All major chemical suppliers sell the compound for a reasonable price nowadays. A convenient preparation is possible by the procedure of Gresham et al, [2] who employed MPA for various organic syntheses. This interesting bifunctional compound is also known as a versatile chain transfer reagent in the telomerization of short oligomers for biotechnological applications. [3]