Reaction of the regioisomers (A and B) of tetrahydrophosphinine oxide 1 with NaOH–H2O–CHCl3 under PTC conditions affords tetrahydrophosphepine oxides 2A and 2B through an unexpected path involving isomerisation of 1 and cyclopropanation via Michael addition of CCl3–.
G. Keglevich, H. Thi Thai Thanh, Á. Szöllősy, K. Újszászy and L. Tőke, J. Chem. Soc., Perkin Trans. 1, 1998, 3323 DOI: 10.1039/A805403G
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