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Showing 1 to 12 of 90 entries
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(1)H NMR spectroscopic elucidation in solution of the kinetics and thermodynamics of spin crossover for an exceptionally robust Fe(2+) complex.

Dalton transactions (Cambridge, England : 2003)

Petzold H, Djomgoue P, Hörner G, Speck JM, Rüffer T, Schaarschmidt D.
PMID: 27506162
Dalton Trans. 2016 Sep 21;45(35):13798-809. doi: 10.1039/c6dt01895e. Epub 2016 Aug 10.

A series of Fe(2+) spin crossover (SCO) complexes [Fe(5/6)](2+) employing hexadentate ligands (5/6) with cis/trans-1,2-diamino cyclohexanes (4) as central building blocks were synthesised. The ligands were obtained by reductive amination of 4 with 2,2'-bipyridyl-6-carbaldehyde or 1,10-phenanthroline-2-carbaldehyde 3. The chelating...

[[Molecular composition of saturated hydrocarbons in diesels by comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry]].

Se pu = Chinese journal of chromatography

Niu L, Liu Z, Zhou J, Cai X, Tian S.
PMID: 25764659
Se Pu. 2014 Nov;32(11):1236-41. doi: 10.3724/sp.j.1123.2014.07015.

An analytical method for separation and identification of the saturated hydrocarbons in diesels at molecular level by comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC x GC-TOF MS)was established. The saturated hydrocarbons were pre-separated from diesel samples...

Fluorinated liquid crystals: evaluation of selectively fluorinated facially polarised cyclohexyl motifs for liquid crystal applications.

Organic & biomolecular chemistry

Al-Maharik N, Kirsch P, Slawin AM, Cordes DB, O'Hagan D.
PMID: 27722421
Org Biomol Chem. 2016 Oct 25;14(42):9974-9980. doi: 10.1039/c6ob01986b.

This paper explores the synthesis of a series of prototype negative dielectric liquid crystalline (LC) compounds which contain fluorinated cyclohexane motifs. The series are analogues and differ only in that they contain between one to four fluorine atoms. The...

Low temperature hydrodeoxygenation of phenols under ambient hydrogen pressure to form cyclohexanes catalysed by Pt nanoparticles supported on H-ZSM-5.

Chemical communications (Cambridge, England)

Ohta H, Yamamoto K, Hayashi M, Hamasaka G, Uozumi Y, Watanabe Y.
PMID: 26446803
Chem Commun (Camb). 2015 Dec 11;51(95):17000-3. doi: 10.1039/c5cc05607a.

The hydrodeoxygenation of various phenols to form cyclohexanes was achieved at 110 °C under an H2 atmosphere at ambient pressure using a Pt/H-ZSM-5 catalyst and octane as the solvent.

Organocatalytic one-pot 1,4-/1,6-/1,2-addition sequence for the stereocontrolled formation of six consecutive stereocenters.

Chemical communications (Cambridge, England)

Chauhan P, Mahajan S, Raabe G, Enders D.
PMID: 25563802
Chem Commun (Camb). 2015 Feb 11;51(12):2270-2. doi: 10.1039/c4cc09730k.

An unprecedented stereoselective organocatalytic one-pot 1,4-/1,6-/1,2-addition sequence between β-dicarbonyl compounds, β-nitroalkenes and 4-nitro-5-styrylisoxazoles sequentially catalyzed by low loading of a squaramide catalyst and an achiral base has been developed. The protocol opens an efficient entry to isoxazole bearing cyclohexanes...

Regiocontrol of radical cyclization by Lewis acids. Efficient synthesis of optically active functionalized cyclopentanes and cyclohexanes.

Organic letters

Kim K, Okamoto S, Sato F.
PMID: 11429874
Org Lett. 2001 Jan 11;3(1):67-9. doi: 10.1021/ol0067890.

[figure: see text] Treatment of alpha-alkylidenelactones 3a-d with Bu3SnH and a catalytic amount of Et3B effected a 5-exo radical cyclization preferentially to provide the corresponding 1 and 2 in a ratio of 70:30 to 100:0. Meanwhile, the reaction of...

Enthalpic and entropic contributions to the conformational free energies of methylthio, methylsulfinyl, methylsulfonyl, phenylthio, phenylsulfinyl, and phenylsulfonyl.

The Journal of organic chemistry

Juaristi E, Labastida V, Antunez S.
PMID: 10814041
J Org Chem. 2000 Feb 25;65(4):969-73. doi: 10.1021/jo991181u.

A variable-temperature NMR study of (cis-4-methylcyclohexyl)methyl sulfide (1), sulfoxide (2), and sulfone (3), as well as (cis-4-methylcyclohexyl)phenyl sulfide (4), sulfoxide (5), and sulfone (6) allowed determination of the thermodynamic parameters, DeltaH degrees and DeltaS degrees, for the title groups....

Alkyl C-O ring cleavage of bicyclic beta-lactones with Normant reagents: synthesis of a Merck IND intermediate.

Organic letters

Zhang W, Matla AS, Romo D.
PMID: 17477537
Org Lett. 2007 May 24;9(11):2111-4. doi: 10.1021/ol070572p. Epub 2007 May 04.

Highly diastereoselective Cu(I)-mediated, bicyclic beta-lactone ring cleavage reactions with either alkyl or aryl cuprates proceeded with inversion of stereochemistry to give optically active trans-substituted cyclopentanes and cyclohexanes. Optimization of typically problematic aryl cuprate additions was made possible by minimization...

A QSPR model for the prediction of the "fish-tail" temperature of C(i)E4/water/polar hydrocarbon oil systems.

Langmuir : the ACS journal of surfaces and colloids

Bouton F, Durand M, Nardello-Rataj V, Borosy AP, Quellet C, Aubry JM.
PMID: 20459074
Langmuir. 2010 Jun 01;26(11):7962-70. doi: 10.1021/la904836m.

The fish-tail temperatures denoted as T* have been determined or collected for 85 ternary systems based on three tetraethylene glycol monoalkyl ethers C(i)E(4) (i = 6, 8, 10), water, and 43 hydrocarbon oils of various hydrophobicities. Fourteen fragrant mono-...

Configuration- and conformation-dependent electronic-structure variations in 1,4-disubstituted cyclohexanes enabled by a carbon-to-silicon exchange.

Chemistry (Weinheim an der Bergstrasse, Germany)

Emanuelsson R, Löfås H, Wallner A, Nauroozi D, Baumgartner J, Marschner C, Ahuja R, Ott S, Grigoriev A, Ottosson H.
PMID: 25043852
Chemistry. 2014 Jul 21;20(30):9304-11. doi: 10.1002/chem.201402610. Epub 2014 Jul 07.

Cyclohexane, with its well-defined conformers, could be an ideal force-controlled molecular switch if it were to display substantial differences in electronic and optical properties between its conformers. We utilize σ conjugation in heavier analogues of cyclohexanes (i.e. cyclohexasilanes) and...

The extent of conformational rigidity determines hydration in nonaromatic hexacyclic systems.

The journal of physical chemistry. B

Boscaino A, Naidoo KJ.
PMID: 21355615
J Phys Chem B. 2011 Mar 24;115(11):2608-16. doi: 10.1021/jp110248j. Epub 2011 Feb 28.

We conducted an ultrasonic study of the hydration number for hexacyclic systems. We find from these experiments that cyclohexane-based molecules such as cyclohexanol and myo-inositol show a very small increase in hydration number despite the large difference in the...

Distinct reactivity of Morita-Baylis-Hillman acetates as a novel C(2) component in amine-catalyzed [2 + 2 + 2] and [2 + 4] annulations.

Chemical communications (Cambridge, England)

Chen R, Xu S, Wang L, Tang Y, He Z.
PMID: 23519093
Chem Commun (Camb). 2013 May 04;49(34):3543-5. doi: 10.1039/c3cc41419a.

Amine-catalyzed [2 + 2 + 2] and [2 + 4] annulations of Morita-Baylis-Hillman (MBH) acetates with cyano activated alkenes and 1,3-azadienes have been developed to provide cyclohexanes and tetrahydropyridines. In the annulations, MBH acetates serve as a novel C(2)...

Showing 1 to 12 of 90 entries