Dalton Transactions

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Titanium(IV) catalysts with ancillary imino-spiroketonato ligands: synthesis, structure and olefin polymerization

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12265-12272
DOI: 10.1039/C5DT01104C, PaperYuguo Ma, Emil B. Lobkovsky, Geoffrey W. Coates
New titanium(IV) complexes having two bidentate [small beta]-iminoethyl-spiro[4,5]decan-6-onato ligands with various N-aryl substituents have been synthesized.
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Titanium pyridonates for the homo- and copolymerization of rac-lactide and [varepsilon]-caprolactone

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12411-12419
DOI: 10.1039/C5DT01162K, PaperDamon J. Gilmour, Ruth L. Webster, Mitchell R. Perry, Laurel L. Schafer
A series of titanium pyridonate complexes have been synthesized under very mild reaction conditions from a common precursor, Ti(NMe2)4. These complexes have been explored as initiators for the ring-opening polymerization of rac-lactide and [varepsilon]-caprolactone and have proven to be competitive with leading titanium initiators.
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Bis(phenolate)amine-supported lanthanide borohydride complexes for styrene and trans-1,4-isoprene (co-)polymerisations

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12312-12325
DOI: 10.1039/C5DT00252D, PaperFanny Bonnet, Hellen E. Dyer, Yassine El Kinani, Carin Dietz, Pascal Roussel, Marc Bria, Marc Visseaux, Philippe Zinck, Philip Mountford
New bis(phenolate)amine-supported neodymium borohydride complexes and their previously reported samarium analogues were tested as catalysts for the polymerisation of styrene and isoprene.
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Olefin polymerisation catalysts: when perfection is not enough

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12304-12311
DOI: 10.1039/C5DT01514F, PaperR. Cipullo, P. Melone, Y. Yu, D. Iannone, V. Busico
Despite decades of thorough mechanistic investigations, it is still hard to predict the activity of a novel olefin polymerisation catalyst, even when the precursor is a well-defined molecular entity. Kinetic studies using quenched-flow methods can help to understand why.
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Ring-opening polymerization of rac-lactide and [small alpha]-methyltrimethylene carbonate catalyzed by magnesium and zinc complexes derived from binaphthyl-based iminophenolate ligands

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12420-12431
DOI: 10.1039/C5DT00158G, PaperMiao Huang, Chen Pan, Haiyan Ma
Magnesium and zinc complexes derived from binaphthyl-based iminophenolate ligands efficiently initiated the ring-opening polymerization of rac-lactide and [small alpha]-MeTMC, with the highest heteroselectivity (Pr = 0.84) or regioselectivity (Xreg = 0.98) obtained for the zinc complex.
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Synthesis, structural studies, kinetic stability, and oxidation catalysis of the late first row transition metal complexes of 4,10-dimethyl-1,4,7,10-tetraazabicyclo[6.5.2]pentadecane

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12210-12224
DOI: 10.1039/C5DT00742A, PaperDallas L. Matz, Donald G. Jones, Kimberly D. Roewe, Michael-Joseph Gorbet, Zhan Zhang, Zhuqi Chen, Timothy J. Prior, Stephen J. Archibald, Guochuan Yin, Timothy J. Hubin
Fe/Mn complexes of ethylene cross-bridged homocyclen catalyze oxygen atom transfer and hydrogen abstraction.
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Aza-nickelacycle key intermediate in nickel(0)-catalyzed transformation reactions

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12060-12073
DOI: 10.1039/C5DT00640F, PerspectiveMasato Ohashi, Yoichi Hoshimoto, Sensuke Ogoshi
Oxidative cyclization of alkynes and imines with nickel(0) is a key step in multicomponent coupling and cycloaddition reactions to give nitrogen-containing organic compounds.
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Catalytic catechol oxidation by copper complexes: development of a structure-activity relationship

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12196-12209
DOI: 10.1039/C5DT01041A, PaperErica C. M. Ording-Wenker, Maxime A. Siegler, Martin Lutz, Elisabeth Bouwman
High activity for the catalytic oxidation of 3,5-di-tert-butylcatechol was achieved with complexes of ligands that stabilize the biomimetic CuII [small mu ]-thiolate complex, hinting at a similarity with the required Cu-oxo intermediates.
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Ligand free copper(I)-catalyzed synthesis of diaryl ether with Cs2CO3via a free radical path

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12086-12090
DOI: 10.1039/C5DT00151J, CommunicationHong-Jie Chen, Mei-Chun Tseng, I-Jui Hsu, Wei-Ting Chen, Chien-Chung Han, Shin-Guang Shyu
Complexes [Cu(I)(2,4-dimethylphenoxy)2]- (A) and [Cu(II)(2,4-dimethylphenoxy)2(p-tolyl)]- (B) were observed by in situ ESI-MS analysis of the ligand free copper(I)-catalyzed C-O coupling reaction using Cs2CO3 under the catalytic reaction conditions.
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P,O-Phosphinophenolate zinc(II) species: synthesis, structure and use in the ring-opening polymerization (ROP) of lactide, [varepsilon]-caprolactone and trimethylene carbonate

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12376-12387
DOI: 10.1039/C5DT00458F, PaperChristophe Fliedel, Vitor Rosa, Filipa M. Alves, Ana. M. Martins, Teresa Aviles, Samuel Dagorne
Structurally diverse phosphinophenolate Zn(II) heteroleptic and homoleptic compounds are reported, some of which efficiently mediate the controlled ROP of lactide, [varepsilon]-caprolactone and trimethylene carbonate under living and immortal conditions.
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Aluminium-catalysed intramolecular hydroamination of aminoalkenes: computational perusal of alternative pathways for aminoalkene activation

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12169-12179
DOI: 10.1039/C5DT00121H, PaperSven Tobisch
Rival mechanistic pathways for C[double bond, length as m-dash]C bond activation in aluminium-catalysed hydroamination: computational mechanistic analysis reveals that a catalytically relevant [(pda)Al(NHR)] compound promotes hydroamination through a stepwise [sigma]-bond insertive mechanism with turnover-limiting aminolysis.
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Titanocene(III) complexes with 2-phosphinoaryloxide ligands for the catalytic dehydrogenation of dimethylamine borane

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12103-12111
DOI: 10.1039/C5DT00275C, PaperMarcus Klahn, Dirk Hollmann, Anke Spannenberg, Angelika Bruckner, Torsten Beweries
A study of the dehydrogenation of dimethylamine borane using different titanocene(III) complexes with 2-phosphinoaryloxide ligands is presented.
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Magnesium amino-bis(phenolato) complexes for the ring-opening polymerization of rac-lactide

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12365-12375
DOI: 10.1039/C5DT00236B, PaperOpen Access Open Access Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Katalin Devaine-Pressing, Joshua H. Lehr, Michelle E. Pratt, Louise N. Dawe, Amy A. Sarjeant, Christopher M. Kozak
Magnesium complexes capable of rac-lactide polymerization in both the melt and in solution at elevated temperatures were synthesized. End-group analysis by MALDI-TOF showed both linear and cyclic PLA.
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Covalent attachment of diphosphine ligands to glassy carbon electrodes via Cu-catalyzed alkyne-azide cycloaddition. Metallation with Ni(II)

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12225-12233
DOI: 10.1039/C5DT00162E, PaperAtanu K. Das, Mark H. Engelhard, Sheri Lense, John A. S. Roberts, R. Morris Bullock
Covalent tethering of a P2N2 ligand to a planar, azide-terminated glassy carbon electrode surface was accomplished using a CuI-catalyzed "click" reaction, followed by metallation with NiII.
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Catalytic aerobic oxidation of phenols to ortho-quinones with air-stable copper precatalysts

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12094-12097
DOI: 10.1039/C5DT00822K, CommunicationM. S. Askari, L. A. Rodriguez-Solano, A. Proppe, B. McAllister, J.-P. Lumb, X. Ottenwaelder
Air-stable Cu(II) species are competent precatalysts in the aerobic oxygenation of phenols into ortho-quinones.
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Recent developments in alkene hydro-functionalisation promoted by homogeneous catalysts based on earth abundant elements: formation of C-N, C-O and C-P bond

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12029-12059
DOI: 10.1039/C5DT00280J, PerspectiveOpen Access Open Access Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Violeta Rodriguez-Ruiz, Romain Carlino, Sophie Bezzenine-Lafollee, Richard Gil, Damien Prim, Emmanuelle Schulz, Jerome Hannedouche
This perspective provides an overview of the recent advancements in earth abundant element-based catalysts for alkene hydrofunctionalisation.
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Alkali metal-mediated dehydrocoupling of Me2NH[middle dot]BH3

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12078-12081
DOI: 10.1039/C5DT00178A, CommunicationPeter Bellham, Michael S. Hill, Gabriele Kociok-Kohn
Bis(trimethylsilyl)amide derivatives of the group 1 elements (Li, Na, K) are competent pre-catalysts for the dehydrocoupling of Me2NH[middle dot]BH3via the formation of intermediates containing [H3BNMe2BH2Me2N]- anions.
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Stoichiometric and catalytic Si-N bond formation using the p-block base Al(NMe2)3

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12112-12118
DOI: 10.1039/C5DT00662G, PaperLucy K. Allen, Raul Garcia-Rodriguez, Dominic S. Wright
The aluminium reagent Al(NMe2)3 acts as a stoichiometric or catalytic reagent in dehydrogenic Si-N bond formation using amines and silanes. The observed catalytic rate law suggests a mechanism involving the silane component in the deprotonation of the amine.
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Synthesis and Lewis acidity of fluorophosphonium cations

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12256-12264
DOI: 10.1039/C5DT00217F, PaperChristopher B. Caputo, Daniel Winkelhaus, Roman Dobrovetsky, Lindsay J. Hounjet, Douglas W. Stephan
A series of fluorophosphonium salts, [R3PF][X] (R = alkyl or aryl; X = FB(C6F5)3, [B(C6F5)4]), have been prepared by reactions of phosphine/borane frustrated Lewis pairs (FLPs) with XeF2 or difluorophosphoranes with [Et3Si][B(C6F5)4].
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Reactions of phenylacetylene with nickel POCOP-pincer hydride complexes resulting in different outcomes from their palladium analogues

6 July, 2015 - 14:17

Dalton Trans., 2015, 44,12128-12136
DOI: 10.1039/C5DT00161G, PaperGleason L. O. Wilson, Medhanei Abraha, Jeanette A. Krause, Hairong Guan
Nickel POCOP-pincer hydride complexes react with phenylacetylene to afford alkenyl complexes whereas the palladium analogues give alkynyl complexes.
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