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Extra resources for A textbook of inorganic chemistry vol.VI part IV Arsenic
Phosphinic Acid-Induced Reversal of Regioselectivity . . . . 45 48 5 Addition of Hydrogen Phosphinates and Extension to Synthesis of P-Chiral Phosphinates . . . . . . . . . . . . . . 50 Addition of Hypophosphite to Unsaturated Compounds . . . 3 6 .. 26 27 Springer-Verlag Berlin Heidelberg 2004 26 Masato Tanaka Conclusion . . . . . . . . . . . . . . . . . . 53 References . . . . . . . . . . . . . . . . . . . . 53 7 1 Introduction Organophosphorus compounds, useful in diverse applications, are still produced by classic methods such as Grignard and Arbuzov reactions.
Addition to Alkenes and Dienes . . . . . . . . . . . 36 41 4 Transition Metal-Catalyzed Addition of Secondary Phosphine Oxides . . . . . . . . . . . 2 Addition to Alkynes . . . . . . . . . . . . . . . Phosphinic Acid-Induced Reversal of Regioselectivity . . . . 45 48 5 Addition of Hydrogen Phosphinates and Extension to Synthesis of P-Chiral Phosphinates . . . . . . . . . . . . . . 50 Addition of Hypophosphite to Unsaturated Compounds .
The dppb additive is speculated to work as a reductant to re-activate catalytically inactive oxidized rhodium species, which can be formed during the catalysis, as suggested by gradual change in color from yellow to orange/brown. The formation of dppb oxide was indeed observed. Addition of dppb to a stalled reaction due to catalyst deactivation resumed the catalysis, where the yellow color of the mixture returned and the reaction proceeded to completion. Scheme 33 Although various substrates that have two alkene linkages or both alkene and alkyne linkages conform to the catalysis, the chemoselectivity is rather low and mixtures of products are formed.