Tetrahydrophosphepine oxides

Reaction of the regioisomers of tetrahydrophosphinine oxide (51) with Na0H-H20-CHCl3 under phase-transfer conditions was found to afford tetrahydrophosphepine oxides (52) through an unexpected path involving isomerization of (51) and cyclopropanation via Michael addition of CCls. (Scheme 21). 

A 3-phospholene oxide, a 1,2,3,6-tetrahydrophosphinine oxide and a 2,3,4,7-tetrahydrophosphepine oxide were prepared by a novel molybdenum-catalyzed asymmetric ring closing metathesis (Scheme 2). ... 

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