Výsledky vyhledávání - "Randolf D. Köhn"

New main-group ferrocenyldithiocarbamates and conversion to ferrocene oxazolidine-2-thione and -2-one

Autor: Reena Yadav, Randolf D. Köhn, Mohd. Muddassir, Suryabhan Singh, Manoj Trivedi, Gabriele Kociok-Köhn, Abhinav Kumar, Nigam P. Rath

Publikováno v: New Journal of Chemistry. 44:3268-3277

Three new main group ferrocenyldithiocarbamate complexes, viz., {Pb[(FcCH2)(CH2CH2OH)(NCS2)]2}·(FcCH2-3-oxazolidine-2-thione)·(H2O) (1), {Sb[(FcCH2)(CH2CH2OH)(NCS2)]3} (2) and {Bi[(FcCH2)(CH2CH2OH)(NCS2)]3} (3), (Fc = ferrocenyl) have been synthesi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cd2e4fe0072be26184d372919166f449
https://doi.org/10.1039/c9nj06139h

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Triazacyclohexane Chromium Triflate Complexes as Precursors for the Catalytic Selective Olefin Trimerisation and its Investigation by Mass Spectrometry

Autor: Samaphon Chunawat, Shahram Mihan, Alexander G.N. Coxon, Callum J. Heron, Gabriele Kociok-Köhn, Catherine L. Lyall, Shaun Reeksting, Randolf D. Köhn

Publikováno v: Köhn, R, Coxon, A, Chunawat, S, Heron, C, Mihan, S, Lyall, C, Reeksting, S & Kociok-Kohn, G 2020, ' Triazacyclohexane Chromium Triflate Complexes as Precursors for the Catalytic Selective Olefin Trimerisation and its Investigation by Mass Spectrometry ', Polyhedron, vol. 185, 114572 . https://doi.org/10.1016/j.poly.2020.114572

A novel set of linear α-olefin trimerisation pre-catalysts is presented. The R3TACCr(OTf)3 (R3TAC = 1,3,5-trialkyl-1,3,5-triazacyclohexane) complexes produce an active system after facile activation with less than 10 equivalents of trialkylaluminium

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ce16bc7cda2b174647de32d484b77c3
https://purehost.bath.ac.uk/ws/files/205093487/POLYH_D_19_01297_R3.pdf

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Efficient 1-Hexene Trimerization with Triazacyclohexane Chromium Catalysts and Detailed Product Analysis by 13C NMR

Autor: Alexander G.N. Coxon, Randolf D. Köhn

Publikováno v: Coxon, A G N & Kohn, R D 2016, ' Efficient 1-hexene trimerization with triazacyclohexane chromium catalysts and detailed product analysis by 13 C NMR ', ACS Catalysis, vol. 6, no. 5, pp. 3008-3016 . https://doi.org/10.1021/acscatal.6b00542

Triazacyclohexane chromium precatalysts are described which catalyze the selective trimerization of 1-pentene, 1-hexene, and 1-octene with unprecedented activity, reaching nearly 5000 turnovers in 1 h. The isomer distribution of the trimers has been

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24608a92e052ab68b5a1e8c3c7a9a4da
https://doi.org/10.1021/acscatal.6b00542

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Synthesis and antimicrobial activity of 1,3-bis-butyl-5-(4-iodophenyl)-1,3,5-triazacyclohexane

Autor: Wissam Mazouz, Leila Lefrada, Ahcene Bouchemma, Souhila Malki, Meriem Hadjem, Randolf D. Köhn

Publikováno v: European Journal of Chemistry. 8:82-84

This work describes the synthesis, structural characterization and antibacterial activities of 1,3,5-triazacyclohexane type of new compound 1,3- bis -butyl-5-(4-iodophenyl)-1,3,5-triazacyclohexane. The new triazacyclohexanes (R3TAC) with mixed aryl a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6184f81e57a97759b3fd0da73be86c27
https://doi.org/10.5155/eurjchem.8.1.82-84.1537

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Selective trimerisation and polymerisation of ethylene: Halogenated chromium triazacyclohexane complexes as probes for an internal ‘halogen effect’

Autor: David Smith, Shahram Mihan, Michael Schiendorfer, Randolf D. Köhn, Katrin Schuhen, Christopher R. Hawkins, Alexander G.N. Coxon, Gabriele Kociok-Köhn

Publikováno v: Kohn, R, Coxon, A G N, Hawkins, C R, Smith, D, Mihan, S, Schuhen, K, Schiendorfer, M & Kociok-Köhn, G 2014, ' Selective trimerisation and polymerisation of ethylene : Halogenated chromium triazacyclohexane complexes as probes for an internal 'halogen effect' ', Polyhedron, vol. 84, pp. 3-13 . https://doi.org/10.1016/j.poly.2014.05.050

A range of triazacyclohexane (R3TAC) complexes of CrCl3 with unsaturated N-substituents R have been prepared. The complexes with R = allyl (3f) and CH2CH(CH2CH = CH2)2 (3h) have been characterised by X-ray crystallography. Addition of HX or X2 (X = C

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f1567a56e8d001e6a0b03096fa663b8
https://doi.org/10.1016/j.poly.2014.05.050

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Unsymmetrically substituted triazacyclohexanes and their chromium complexes

Autor: Frank Schaper, Saida Latreche, Gabriele Kociok-Köhn, Randolf D. Köhn, Abdelhamid Mousser

Publikováno v: Polyhedron. 29:1399-1404

The unsymmetrically N-substituted N,N′-Ar2-N″-R-1,3,5-triazacyclohexanes 1–4 (Ar = ortho- or para-fluorophenyl, R = n- or iso-propyl) can be obtained in good yields from a one-step condensation reaction with excess amine. Solid state structures

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fbc32fea8fb7e0ae11f3a01f680a0a40
https://doi.org/10.1016/j.poly.2010.01.008

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Reaction of 1,3,5‐Triazacyclohexanes with TiCl 4 : Formation of Cationic Complexes

Autor: Philip Kampe, Randolf D. Köhn, Gabriele Kociok-Köhn

Publikováno v: European Journal of Inorganic Chemistry. 2005:3217-3223

N-substituted 1,3,5-triazacyclohexanes [R3TAC; R = cyclohexyl, p-fluorobenzyl or Ph(CH2)n (n = 1, 2, 3)] react with excess TiCl4 to give the corresponding cationic κ3 complexes [(R3TAC)TiCl3][Ti2Cl9]. Attempts to prepare complexes with titanium-free

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0ec7969e9eebdbfba76c0fa75221464d
https://doi.org/10.1002/ejic.200500122

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Coordination chemistry of the activation of [(triazacyclohexane)CrCl3] with [PhNMe2H][B(C6F5)4] and AlR3

Autor: Shahram Mihan, Gabriele Kociok-Köhn, Randolf D. Köhn, Mary F. Mahon, David Smith, Martina Prinz

Publikováno v: Journal of Organometallic Chemistry. 683:200-208

Complexes of N-substituted 1,3,5-triazacyclohexanes with CrCl3 form 1:1 adducts with [PhNMe2H][B(C6F5)4] with increased solubility in toluene. Addition of AliBu3 leads to free PhNMe2 and a complex with [B(C6F5)4]− weakly coordinated to chromium via

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d70e338a219b2946ac0af930ccbcc059
https://doi.org/10.1016/s0022-328x(03)00634-x

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Coordination chemistry of copper-(i) and -(ii) with 2-pyridylmethyl substituted triazacyclohexanes

Autor: Randolf D. Köhn, Mary F. Mahon, Zhida Pan, Gabriele Kociok-Köhn

Publikováno v: Dalton Trans.. :2269-2275

The syntheses of several novel copper-(I) and -(II) compounds containing triazacyclohexanes with one or three 2-pyridylmethyl substituents are described. The molecular structures of (2-PyMe)3TACCuCl23, [(2-PyMe)Et2TACCuCl2]24 and [(2-PyMe)3TACCuI](BF

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c7d6b19012404da12712fc93129fe829
https://doi.org/10.1039/b302037a

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