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Samarium(II)-Mediated Pinacol Coupling in Water: Occurrence of Unexpected Disproportionation and Action of Low-Valent Samarium as an Active Species

Satoru Matsukawa* and Yumi Hinakubo

*Department of Science, Faculty of Education, Ibaraki University, Mito, Ibaraki 310-8512, Japan, Email:

S. Matsukawa, Y. Hinakubo, Org. Lett., 2003, 5, 1221-1223.

DOI: 10.1021/ol0341344

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Unexpected disproportionation of SmCl3-Sm in water was observed via UV-vis spectroscopic analysis indicating that low-valent samarium(II) species can exist in water. SmCl3-Sm and SmCl3-Mg systems were found to act as good one-electron reducing agents in water.

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Key Words

Pinacol reaction, pinacol coupling, Samarium (low valent)

ID: J54-Y2003-380