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1,1-Diphenylphosphorinanium bromide

EtI the quaternary 1-ethyl-1-phenylphosphorinanium iodide, m.p. 188 °C, is formed (15CB1473). An excellent variant, again using 1,5-dibromopentane (or the very important l,5-dibromo-3-r-butylpentane) by reaction with tetraphenyldiphosphine, gives the 1,1-diphenylphosphorinanium bromides in 72% and 43% yield, respectively (equation 4) <63AG(E)620,77JOC1306). [Pg.500]

Hydrolysis of 1,1-diphenylphosphorinanium bromide 71 with aq NaOH gave phosphine oxide 72 in 99% yield. Phosphine oxide was further reductively alkylated to 73 using Si(0Et)3H/Ti(0-7Pr)4 with various alkyl bromides <1998SL497> (Scheme 3). Bicyclic phosphines 74 were alkylated to 75 using BuLi/RBr (Equation 4) <2003JCD2036, 2003JCD4669>. [Pg.1017]

See other pages where 1,1-Diphenylphosphorinanium bromide is mentioned: [Pg.1020]    [Pg.158]    [Pg.1020]    [Pg.158]   
See also in sourсe #XX -- [ Pg.112 ]



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