Emma L. Doyle
University of Cambridge
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Featured researches published by Emma L. Doyle.
Chemistry: A European Journal | 2002
Alan Bashall; Andrew D. Bond; Emma L. Doyle; Felipe García; Sara J. Kidd; Gavin T. Lawson; Mark C. Parry; Mary McPartlin; Anthony D. Woods; Dominic S. Wright
Amination of [ClP(micro-NtBu)](2) (1) using NH(3) in THF gives the cyclophospha(III)zane dimer [H(2)NP(micro-NtBu)](2) (2), in good yield. (31)P NMR spectroscopic studies of the reaction of 1 with 2 in THF/Et(3)N show that almost quantitative formation of the cyclic tetramer [[P(micro-NtBu)](2)(micro-NH)](4) (3) occurs. The remarkable selectivity of this reaction can (in part) be attributed to pre-organisation of 1 and 2, which prefer cis arrangements in the solid state and solution. The macrocycle 3 can be isolated in yields of 58-67 % using various reaction scales. The isolation of the major by-product of the reaction (ca. 0.5-1 % of samples of 3), the pentameric, host-guest complex [[P(micro-NtBu)(2)](2)(micro-NH)](5)(HCl).2 THF] (4.2 THF), gives a strong indication of the mechanism involved. In situ (31)P NMR spectroscopic studies support a stepwise condensation mechanism in which Cl(-) ions play an important role in templating and selection of 3 and 4. Amplification of the pentameric arrangement occurs in the presence of excess LiX (X=Cl, Br, I). In addition, the cyclisation reaction is solvent- and anion-dependent. The X-ray structures of 2 and 4.2 THF are reported.
Chemical Communications | 2003
Andrew D. Bond; Emma L. Doyle; Felipe García; Richard A. Kowenicki; Mary McPartlin; Lucía Riera; Dominic S. Wright
The in situ reaction of the phosphazane dimer [ClP(µ-N-2-NC5H4)]2 (2) with CuCl in the presence of C5H5N/H2O gives the title complex [{P(µ-N-2-NC5H4)}2(µ-O)]2{CuCl·(C5H5N)2}4 (1), containing a tricyclic [{P(µ-N-2-NC5H4)}2(µ-O)]2 ligand which is isoelectronic with species of the type [{P(µ-NR)}2NR]2.
Dalton Transactions | 2004
Emma L. Doyle; Felipe García; Simon M. Humphrey; Richard A. Kowenicki; Lucía Riera; Anthony D. Woods; Dominic S. Wright
The reaction of [ClP(mu-NtBu)]2 (1) with H2O (1 : 2 equivalents) in the presence of excess Et3N gives the new chain compound [(mu-O)[P(mu-NtBu)2P(H)=O]2] (3), consisting of two P2N2 rings linked by a mu-O atom and terminating in P(V)(H)=O groups. A similar chain species is obtained from the reaction of the lithiate of [(tBuNH)P(mu-NtBu)2P(H)=O] (5) with [ClP(mu-NtBu)2P(NHtBu)] (2), the product being [(mu-O)[P(mu-NtBu)2P(NHtBu)]2] (6). Compounds 3 and 6 are the first examples of O-bridged chain phosphazanes and potential precursors to new phosphorus-nitrogen macrocycles. The syntheses and X-ray structures of 3, 5 and 6 are reported.
Chemical Communications | 2003
Andrew D. Bond; Emma L. Doyle
The crystal structure of 2,6-di(Pr(i))aniline hydrochloride contains hydrogen-bonded cubanes analogous to those in the complexes [M(2+)(2,6-di(Pr(i))C6H5N(2-))]4, M = Sn, Pb.
Chemical Communications | 2001
Andrew D. Bond; Emma L. Doyle; Sara J. Kidd; Anthony D. Woods; Dominic S. Wright
The neutral ligand [ButNHP(μ-NBut)2PNH(2-py)] and its dilithiate [{ButNP(μ-NBut)2PN(2-py)}Li 2] exhibit a parallel ability to coordinate cations and anions, as revealed in the structures of the tris-solvate [LiCl{ButNHP(μ-NBut)2PNH(2-py) }3] 1 and the unusual co-complex [{ButNP(μ-NBut)2PN(2-py)}Li 2·{Li(ButN)2P}] 2.
Chemical Communications | 2001
Alan Bashall; Emma L. Doyle; Catherine Tubb; Sara J. Kidd; Mary McPartlin; Anthony D. Woods; Dominic S. Wright
The 1∶1 reaction of the symmetrical dimers [ClP(μ-NtBu)]21 and [H2NP(μ-NtBu)]22 in thf–Et3N gives the tetrameric macrocycle [{P(μ-NtBu)}2NH]43 (67%); consisting of four P2(μ-NtBu)2 rings linked by endo N–H groups.
European Journal of Inorganic Chemistry | 2003
Emma L. Doyle; Lucía Riera; Dominic S. Wright
Chemistry: A European Journal | 2002
Alan Bashall; Emma L. Doyle; Felipe García; Gavin T. Lawson; David J. Linton; David Moncrieff; Mary McPartlin; Anthony D. Woods; Dominic S. Wright
Chemistry: A European Journal | 2004
Andrew D. Bond; Emma L. Doyle; Felipe García; Richard A. Kowenicki; David Moncrieff; Mary McPartlin; Lucía Riera; Anthony D. Woods; Dominic S. Wright
Angewandte Chemie | 2000
Francesca Benevelli; Emma L. Doyle; Eilis A. Harron; Neil Feeder; Elsje Alessandra Quadrelli; David Sáez; Dominic S. Wright