How is [2-Hydroxy-3-[2-hydroxy-3-[2-hydroxy-3-[2-hydroxy-3-[2-hydroxy-3-[2-hydroxy-3-[(Z)-octadec-9-enoyl]oxypropoxy]propoxy]propoxy]propoxy]propoxy]propyl] (Z)-octadec-9-enoate (CAS: 76009-37-5) typically synthesized?

This compound is synthesized through a series of Michael addition reactions involving a cyclic enone and a reducing agent followed by esterification. The key steps involve the use of a zinc amalgam reduction to form the corresponding alcohol, and then subsequent Michael addition reactions with cyclic enone derivatives, followed by esterification with octadec-9-enoic acid. The overall yield is moderate, around 50-60%, and the selectivity is high.