Selenide, triphenylphosphine epoxides

Triphenylphosphine selenide, potassium selenocyanate, 3-methyl-2-selenoxobenzothiazole sodium 0,0-diethyl phosphorotelluronate," 0,0-dialkyIphosphoroselenoic acid salts" and benzenese-lenocarboxamide, have all been reported as reagents capable of one-step deoxygenation of epoxides. [Pg.887]

Most of the examples of seleniranes and telluriranes shown as the unstable intermediates in the organic synthesis are derived from oxiranes. As discussed previously in Section 1.07.6.2, seleno-cyanate anions react with epoxides at room temperature to deposit selenium via the selenirane intermediate and form the corresponding alkenes. On the other hand, triphenylphosphine selenide and trifluoroacetic acid constitute an effective and mild combination of reagents for carrying out the deoxygenation of epoxides (67) to alkenes via cyclic intermediate (68) (Scheme 12) <73CC253>. [Pg.272]

Epoxide deoxygenation by or via phosphine oxides or selenides continues to attract attention. Further study of deoxygenation by triphenylphosphine selenide (30) has implicated episelenide intermediates, and n.m.r., chemical,... [Pg.68]

ENYNES Diacetatobis(triphenylphosphine)paIladium(II). Tetrakis(triphenylphosphine)-palladium(O). Tetramethylethylenediamine. 1 -TrimethyIsilylpropynylcopper. EPISULFONIUM SALTS Methyl(bismethylthio)sulfonium hexachloroantimonate. EPOXIDES Bromomethyllithium. Diphenyl selenide. Methaneselenol. [Pg.787]

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