N-(2‘-Phenylphenyl)benzenesulfonamides react with acrylate esters accompanied via cleavage of
the C−H bond at their 2‘-position in the presence of a catalyst system of Pd(OAc)2 and Cu(OAc)2
and a base under air to produce 5,6-dihydro-5-(benzenesulfonyl)phenanthridine-6-acetate derivatives
in high yields. The reactions of benzoic acid with butyl acrylate and styrene can also give
3-[(butoxycarbonyl)methyl]phthalide and 3-phenylisocoumarin, respectively.
2-Phenylphenols react with alkenes such as acrylate esters in the presence of a palladium-copper catalyst system under air to give the corresponding 6-substituted 6H-dibenzo[b,d]pyran derivatives.
Eleven secondary amines such as (I) are oxidized with hydrogen peroxide in the presence of catalytic amounts of sodium tungstate to produce the corresponding nitrones (II).
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