Photoisomerization of Ionic Liquid Ammonium Cinnamates: One-Pot Sythesis-Isolation of Z-Cinnamic Acids

MARÍA L. SALUM; CECILIA J. ROBLES ; ROSA ERRA-BALSELLS

ORGANIC LETTERS

AMER CHEMICAL SOC

Año: 2010 vol. 12 p. 4808 - 4811

1523-7060

Photoisomerization presents the only direct method for contra-thermodynamic E-Z isomerization of olefins. Synthetic applications of this method have been limited by its reversible nature, which leads to a photostationary-state mixture of both isomers. For the first time, a highly efficient one-pot preparation-isolation of solid ionic liquid Z-cinnamic acids by photoisomerization in acetonitrile solution of ionic liquid E-cinnamic acids is described.