Table 3. Reactivity of Substituted Benzophosphole Oxides 5b–d with Aryl Grignard Reagents^a,b,c.

^aReaction conditions: 5a (0.13 mmol), ArMgBr (0.195 mmol), THF (2 mL).

^bIsolated yields of product.

^cNumbers in parentheses indicate yields according to ³¹P NMR.

^dFormation of a small amount of ketone 3a was observed but not isolated.