4,4′-Dimethoxybenzophenone: a triclinic polymorph

Fun, Hoong‐Kun; Franklin, S.; Jebas, Samuel Robinson; Balasubramanian, T.

doi:10.1107/s1600536808017315

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…Their orientation with respect to the mean macrocycle plane are 75.85° and 17.67°. The relative orientation of the alkoxyphenylenes and the carbonyl agrees with that of 4,4′-dimethoxybenzophenone 57,58 (Supplementary Methods) showing that these angles are the result of cross-conjugation rather than sterics originating from the macrocycle. It is clear that the macrocycle cavity has undergone substantial contraction in 1 (c.f.…”

Section: Resultssupporting

confidence: 64%

Molecular memory with downstream logic processing exemplified by switchable and self-indicating guest capture and release

et al. 2019

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Molecular-logic based computation (MLBC) has grown by accumulating many examples of combinational logic gates and a few sequential variants. In spite of many inspirations being available in biology, there are virtually no examples of MLBC in chemistry where sequential and combinational operations are integrated. Here we report a simple alcohol-ketone redox interconversion which switches a macrocycle between a large or small cavity, with erect aromatic walls which create a deep hydrophobic space or with collapsed walls respectively. Small aromatic guests can be captured or released in an all or none manner upon chemical command. During capture, the fluorescence of the alcohol macrocycle is quenched via fluorescent photoinduced electron transfer switching, meaning that its occupancy state is self-indicated. This represents a chemically-driven RS Flip-Flop, one of whose outputs is fed into an INHIBIT gate. Processing of outputs from memory stores is seen in the injection of packaged neurotransmitters into synaptic clefts for onward neural signalling. Overall, capture-release phenomena from discrete supermolecules now have a Boolean basis.

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Section: Resultssupporting

confidence: 64%

Molecular memory with downstream logic processing exemplified by switchable and self-indicating guest capture and release

et al. 2019

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“…11a,13b,c Thus, replacement of the coordinating diethyl ether with an aromatic ketone on going from 1 to 2 does not significantly affect the bond lengths within diimine fragments (C( 1 is remarkably shorter compared to the Al-O(ether) bond in 1 (1.916(3) Å). Elongation of CvO in the coordinated ketone in 2 (1.257(2) Å) compared to that in free ketone (1.227(2) Å) 14 as well as the linearity of the Al-O(1)-C(37) angle (163.7(1)°) may indicate some π bonding between aluminum and oxygen in 2.…”

Section: Molecular Structures Of 2 3 Andmentioning

confidence: 98%

Unexpected reactivity of an alkylaluminum complex of a non-innocent 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene ligand (dpp-bian)

et al. 2016

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The reaction of (dpp-bian)AlEt(EtO) (1) (dpp-bian = 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene) with 4,4'-dimethoxybenzophenone leads to the replacement of EtO with the ketone resulting complex (dpp-bian)AlEt[O[double bond, length as m-dash]C(4-MeOCH)] (2). The reaction of compound 1 with 2,6-di-tert-butyl-4-methylphenol (1 : 1) or PhNH (1 : 1) affords the addition products [dpp-bian(H)]AlEt[O(2,6-tBu-4-MeCH)] (3) and [dpp-bian(H)]AlEt(NPh) (4) correspondingly. Treatment of complex 1 with 0.5 molar equivalents of HO gives ethylalumoxane {[dpp-bian(H)]AlEt}(μ-O) (5). Newly prepared complexes 2-5 have been characterized by NMR and IR spectroscopy, and the molecular structures of 2, 3, and 5 have been determined by single crystal X-ray analysis.

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“…Two ruthenium carbenes of this type are known; [29][30][31] interestingly, neither 13 nor 14 show any significant shortening of the C1 À C ipso bonds, the lengths of which are comparable to those of the parent ketone 12. [32] In contrast, the pattern in 11 echoes the situation in a series of prototype diarylcarbenium ions, such as 15-18. [33] Manifestly, the substituted arene rings play the dominant role in stabilizing the gold carbenoid.…”

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confidence: 97%

Structure of a Reactive Gold Carbenoid

2014

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A formal gold-for-chromium transmetalation allowed the gold carbenoid species [Cy₃PAuCAr₂]NTf₂ (11) (Ar=pMeOC₆H₄-) to be obtained in crystalline form. The structure in the solid state suggests that there is only little back donation of electron density from gold to the carbene center of 11 and hence very modest Au—C double-bond character; rather, it is the organic ligand framework that is responsible for stabilizing this species by resonance delocalization of the accumulated positive charge. Because 11 is capable of cyclopropanating p-methoxystyrene even at low temperature, the discussion of its structure is deemed relevant for a better understanding of the mechanisms of π-acid catalysis in general

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4,4′-Dimethoxybenzophenone: a triclinic polymorph

Cited by 6 publications

References 4 publications

Molecular memory with downstream logic processing exemplified by switchable and self-indicating guest capture and release

Molecular memory with downstream logic processing exemplified by switchable and self-indicating guest capture and release

Unexpected reactivity of an alkylaluminum complex of a non-innocent 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene ligand (dpp-bian)

Structure of a Reactive Gold Carbenoid

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