“…[1] Especially castor oil is a very versatile renewable feedstock for all kinds of polymeric materials, including, e.g., polyesters, polyamides, polyurethanes, and many others. [2] One of the commercially available castor oil derived platform chemicals, 10-undecenoid acid 1, [2,3] was recently used to prepare polyamides X,20, [4] a variety of acyclic diene metathesis derived polyesters, [5][6][7] as well as different cross-linked materials, [8][9][10] thus demonstrating its broad range of application possibilities.…”