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41 results on '"Linton, David J."'

6. Letters

Author

Linton, David J.

Published
1982

18. A solid state and theoretical study of the solvent effects controlling the mono- and di-lithiation of aromatic primary amines

Author

Armstrong, David R., primary, Ball, Sarah C., additional, Barr, Donald, additional, Clegg, William, additional, Linton, David J., additional, Kerr, Lesley C., additional, Moncrieff, David, additional, Raithby, Paul R., additional, Singer, Robert J., additional, Snaith, Ronald, additional, Stalke, Dietmar, additional, Wheatley, Andrew E. H., additional, and Wright, Dominic S., additional

Published
2002
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34. New motifs in lithium zincate chemistry: a solid-state structural study of PhC(O)N(R)ZnR'<SUB>2</SUB>Li·2thf (R, R' = alkyl, aryl) and [PhC(O)N(Ph)Li·thf]·[PhC(O)N(Ph)Zn(But)<SUB>2</SUB>Li·thf]

Author

Boss, Sally R., Haigh, Robert, Linton, David J., Schooler, Paul, Shields, Gregory P., and Wheatley, Andrew E. H.

Abstract

The facile reaction of ZnMe2 with secondary carboxylic amides of the type PhC(O)N(R)H (R = Me 14, Pri 15, Ph 16) yields PhC(O)N(R)ZnMe (R = Me 17, Pri 18, Ph 19). These complexes describe a hexamer (for 17) and tetramers (for 18 and 19) in the solid state which are best viewed as stacks of cyclic trimers and dimers, respectively. In turn, 17–19 react with ButLi to afford either the lithium zincate PhC(O)N(R)Zn(But)2Li·2thf (R = Me 20, Pri 21) or the co-complex [PhC(O)N(Ph)Li·thf]·[PhC(O)N(Ph)Zn(But)2Li·thf] 22. In the solid state both 20 and 21 reveal dimeric structures based on a (LiO)2 core in which each alkali metal centre is doubly thf-solvated and trivalent zinc centres reside peripheral to the cluster. The structure of 22 reveals an adduct in which a dimeric lithium (carboxylic) amide core interacts with two PhC(O)N(Ph)Zn(But)2Li molecules, affording a structure intermediate between a ladder and an “open” pseudo-cubane. This is the first full characterisation of a complex between an alkali metal zincate and another organometallic species and it affords new insights into how these two classes of molecule interact. The straightforward formation of [PhC(O)N(R)ZnMe2]− (R = Me 23, Ph 24) ions has been successfully achieved by treating the appropriate lithium carboxylic amide with ZnMe2. In the solid-state, PhC(O)N(Ph)ZnMe2Li·2thf 24 is revealed to be isostructural with 20 and 21.

Published
2003

35. Oxygen scavenging by lithium zincates: the synthesis, structural characterisation and derivatisation of [Ph(2-C<SUB>5</SUB>H<SUB>4</SUB>N)N]<SUB>2</SUB>ZnRLi·nthf (R = But, Bun; n = 1, 2)

Author

Boss, Sally R., Haigh, Robert, Linton, David J., and Wheatley, Andrew E. H.

Abstract

The 1 ∶ 2 reaction of ZnMe2 with N-2-pyridylaniline, Ph(2-C5H4N)NH 1, affords [Ph(2-C5H4N)N]2Zn 10, the treatment of which with BuLi and thf affords the diastereomeric lithium zincate [Ph(2-C5H4N)N]2ZnRLi·nthf (R = Bun, n = 2; 11a; R = But, n = 1, 11b). The sequential treatment of 10 (either in situ or after isolation) with organolithium substrates and molecular oxygen has afforded insights into the oxygen-scavenging capacity of mixed Group 1–Group 12 species. Hence, 10 reacts with BunLi, O2 and thf or dimethoxyethane (dme) to give {[Ph(2-C5H4N)N]2ZnOBunLi·nL}2 (n = 1, L = thf, 12a; n = 0.5, L = dme, 12b), with the structural relationship between 11a and 12a strongly suggesting that for R = Bun oxygenation proceeds by insertion into the Zn–C bond of an {[Ph(2-C5H4N)N]2ZnR}− ion. The employment of ButLi, O2 and thf together with 10 affords only the previously reported complex [Ph(2-C5H4N)N]2Zn[(μ3-O)But]2(Li·thf)2 4, the formation of which may be rationalised in terms of the But van der Waals radius and cone angle.

Published
2002

36. Synthesis and Solid‐State Structure of (Li4Am3)+·{Li[(μ‐Me)2Al(Me)tBu]2}−{Am = [PhNC(Ph)NPh]−}: A Polymeric Species Incorporating a Lithium‐Nitrogen Cluster Cation

Author

Davies, Robert P., Linton, David J., Schooler, Paul, Snaith, Ronald, and Wheatley, Andrew E. H.

Abstract

The sequential reaction of PhN(H)C(Ph)NPh (AmH) with AlMe3and tBuLi leads to the isolation of both the cluster (Li4Am3)+·{Li[(μ‐Me)2Al(Me)tBu]2}−(5)and the aluminium tris(amidinate) AlAm3(6). In the solid state, 5has a polymeric structure based on tetranuclear Li4‐cluster cations and lithium bis(aluminate) anions which associate by the formation of weak Li···MeAl bonds.

Published
2001
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37. Database Security.

Author

Davida, George I., Linton, David J., Szelag, C. Russell, and Wells, David L.

Subjects
*DATABASE security, *INFORMATION storage & retrieval systems, *COMPUTER security, *DATABASES, *COMPUTER files, *ELECTRONIC information resources, *DATA protection, *SECURITY systems, *SOFTWARE engineering
Abstract

Databases may be compromised by asking a set of queries which return only statistical information and making inferences about a specific entry from the results of the set of queries. We present methods of constructing the set of queries to compromise a database where all the queries in the set return the maximum of a set of k elements, or all queries return the mean of a set of k elements. In the case of the mean query, all elements involved will be compromised. We also consider bounds on the number of queries required to compromise the database. [ABSTRACT FROM AUTHOR]

Published
1978

38. Synthesis and structure of [{Sb(μ-NCy)}<SUB>2</SUB>(μ-N)]<SUB>3</SUB>(Li·THF)<SUB>3</SUB>(LiN&z.dbd;NH), containing a macrocyclic [{Sb(μ-NCy)}<SUB>2</SUB>N]<SUB>3</SUB>3− trianion

Author

García, Felipe, Linton, David J., McPartlin, Mary, Rothenberger, Alexander, Wheatley, Andrew E. H., and Wright, Dominic S.

Abstract

Reaction of the Sb(iii) dimer [Me2NSb(μ-NCy)]2 with LiNH2 (1 ∶ 2 equivalents, respectively) gives [{Sb(μ-NCy)}2N]3(Li·THF)3(LiN&z.dbd;NH)·0.25(dioxane) 4, in which four Li+ cations are coordinated within the trimeric cavity of the macrocyclic trianion [{Sb(μ-NCy)}2N]33−.

Published
2002

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