The facile assembly of bis-, tris- and poly(triazaphosphole) systems using “click” chemistry
作者:Sam L. Choong、Ayman Nafady、Andreas Stasch、Alan M. Bond、Cameron Jones
DOI:10.1039/c3dt50505g
日期:——
Uncatalysed 1,3-dipolar cycloaddition reactions between two phosphaalkynes, PCR (R = But or Me), and a series of di-, tri- and poly-azido precursor compounds have given very high yields of a range of triazaphosphole substituted systems. These comprise the 1,1â²-bis(triazaphosphole)ferrocenes, [FeC5H4(N3PCR)}2], the tris(triazaphosphole)cyclohexane, cis-1,3,5-C6H9(N3PCBut)3, and the poly(allyltriazaphosphole)s, C3H5(N3PCR)}â. Electrochemical studies on the 1,1â²-bis(triazaphosphole)ferrocenes reveal the compounds to undergo reversible 1-electron oxidation processes, at significantly more positive potentials than ferrocene itself. Attempts to chemically oxidise one 1,1â²-bis(triazaphosphole)ferrocene with a silver salt, Ag[AlOC(CF3)3}4] were not successful, and led to the formation of a silver coordination complex, [Fe[μ-C5H4(N3PCBut)]2(μ-Ag)}2][AlOC(CF3)3}4]2, thereby demonstrating the potential the reported triazaphosphole substituted systems possess as novel ligands in coordination chemistry.
Facile formation of benzene from a novel cyclohexane derivative
作者:Xiadong Liu、Guangtao Zhang、John G Verkade
DOI:10.1016/s0040-4039(01)00745-6
日期:2001.7
Upon acidification, benzene forms at room temperature from the novel 1,3,5-cis-trisubstituted cyclohexane wherein the substituents are the azido phosphine cage moieties N3P(MeNCH2CH2)3N. The dominant reaction in the decomposition of this unusually thermally stable intermediate in the presence of HA is the formation of nitrogen and the salt [H2NP(MeNCH2CH2)3N]A in addition to benzene. Evidence for a transannulated