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A monoalkylated 1,8-bis(diphenylphosphino)naphthalene (dppn) was prepared by treating diphosphine with 1,8-bis(bromomethyl)naphthalene. Unprecedented cyclizations of monophosphonium salts in polar solvents, such as DMF or acetonitrile were elucidated. The mechanistic pathway of the cyclization reaction was postulated and X-ray crystal structure analyses of the resulting 2,2-diphenyl-2,3-dihydro-1H-2-phosphoniaphenalene...
Sulfenylation and selenenylation of α-phosphoryl sulfoxides 1 with S-methyl methanethiosulfonate and phenylselenenyl bromide, respectively, affording α-methylsulfenyl- and α-phenylselenenyl-α-phosphoryl sulfoxides 8 and 9 are described. Sulfenylation of (+)-(S)-dimethoxyphosphorylmethyl p-tolyl sulfoxide 2 gave a mixture of optically active diastereoisomers of the sulfoxide 8a which is a key substrate...
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