On the Crystal Structure of NH4SnBr3.H2O.

Andersson, Jan; Särnstrand, Christer; Bergesen, Knut; Vilkov, L. V.; Sandström, M.

doi:10.3891/acta.chem.scand.30a-0229

Cited by 7 publications

(12 citation statements)

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“…The presence of a methoxy group at the 3-position of the starting phenol also led to the nondimerizing 5,6,6-trimethoxycyclohexa-2,4-dienone (73f), in agreement with Andersson's observations on periodatemediated oxidation of phenols. 11,89 These results thus confirmed the critical and fine influence exhibited by substituent positioning and size on the stability of ortho-quinone monoketals. Most importantly, these results revealed that anodic oxidation is a valuable alternative to the use of more conventional chemical reagents for the generation of ortho-quinone monoketals.…”

Section: Figuresupporting

confidence: 84%

“…Only when their substitution pattern sterically blocks the [4+2]-cycloaddition process can these species be isolated as such. 11,12 The behavior of ortho-quinone monoketals does not depart from this rule. For example, simple 6,6-dimethoxycyclohexa-2,4-dienones, which can be easily generated by oxidative dearomatizing methoxylation of 2-methoxyphenols using either Wessely 13,14 3,4 it really boded no good for our objective of expanding the chemistry of ortho-quinone monoketals beyond their participation in Diels-Alder reactions.…”

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confidence: 88%

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Oxidative Dearomatization of Phenols: Why, How and What For?

Quideau¹,

Pouységu²,

Deffieux³

2008

Synlett

438

122

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Section: Figuresupporting

confidence: 84%

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confidence: 88%

Oxidative Dearomatization of Phenols: Why, How and What For?

Quideau¹,

Pouységu²,

Deffieux³

2008

Synlett

438

122

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“…The Sn–Br bond lengths are in the range of 2.724(2)–3.117 Å, which is comparable to the distances found in (NH 4 )SnBr 3 ×H 2 O (2.623–3.047 Å), where Sn(II) has the same square-pyramidal coordination. 47 The shortest Sn–Br bond is with the Br ion at the apex of the pyramid. G 2 SnBr 4 ( I ) has a similar crystal structure to G 2 PbBr 4 , which contains an alternating orientation of [PbBr 5 ] 2– square pyramids in 1D chains.…”

Section: Resultsmentioning

confidence: 99%

Guanidinium and Mixed Cesium–Guanidinium Tin(II) Bromides: Effects of Quantum Confinement and Out-of-Plane Octahedral Tilting

et al. 2019

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Hybrid organic–inorganic main-group metal halide compounds are the subject of intense research owing to their unique optoelectronic characteristics. In this work, we report the synthesis, structure, and electronic and optical properties of a family of hybrid tin (II) bromide compounds comprising guanidinium [G, C(NH 2 ) 3 + ] and mixed cesium–guanidinium cations: G 2 SnBr 4 , CsGSnBr 4 , and Cs 2 GSn 2 Br 7 . G 2 SnBr 4 has a one-dimensional structure that consists of chains of corner-sharing [SnBr 5 ] 2– square pyramids and G cations situated in between the chains. Cs + exhibits a pronounced structure-directing effect where a mixture of Cs + and G cations forms mono- and bilayered two-dimensional perovskites: CsGSnBr 4 and Cs 2 GSn 2 Br 7 . Furthermore, the flat shapes of the guanidinium cations induce anisotropic out-of-plane tilts of the [SnBr 6 ] 4– octahedra in the CsGSnBr 4 and Cs 2 GSn 2 Br 7 compounds. In G 2 SnBr 4 , the Sn lone pair is highly stereoactive and favors non-octahedral, that is, square pyramidal coordination of Sn(II). G 2 SnBr 4 exhibits bright broad-band emission from self-trapped excitonic states, owing to its soft lattice and electronic localization. This emission in G 2 SnBr 4 is characterized by a photoluminescence (PL) quantum yield of 2% at room temperature (RT; 75 ± 5% at 77 K) and a fast PL lifetime of 18 ns at room temperature.

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“…15,28 Indeed, no dimer was observed and a clean 1:1 mixture of the orthoquinol 3h 47 and the orthoquinone 9 was obtained in ca. 83% yield.…”

Section: Methodsmentioning

confidence: 99%

Iodane-mediated and electrochemical oxidative transformations of 2-methoxy- and 2-methylphenols

Quideau¹,

Pouységu²,

Deffieux³

et al. 2003

Arkivoc

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A series of 2-methoxy and 2-methylphenols have been submitted to oxygenative oxidation reactions using (1) the λ 3 -iodane DIB, (2) a non-explosive and non-moisture sensitive version of the λ 5 -iodane IBX, named SIBX for Stabilized IBX, and (3) anodic oxidation with the aim of identifying the best reaction conditions for preparing orthoquinonoid cyclohexadienone synthons. Both the use of DIB and anodic oxidation appeared equally valuable for making orthoquinone dimethyl ketals, but the λ 3 -and λ 5-iodane reagents are more appropriate to induce ortho-oxygenation of 2-methylphenols. In particular, SIBX emerged as a useful reagent for mediating ortho-hydroxylation into dimerizing orthoquinols, a tactic that can be applied to the synthesis of natural bis(monoterpenoids) such as aquaticol.

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On the Crystal Structure of NH4SnBr3.H2O.

Cited by 7 publications

References 0 publications

Oxidative Dearomatization of Phenols: Why, How and What For?

Oxidative Dearomatization of Phenols: Why, How and What For?

Guanidinium and Mixed Cesium–Guanidinium Tin(II) Bromides: Effects of Quantum Confinement and Out-of-Plane Octahedral Tilting

Iodane-mediated and electrochemical oxidative transformations of 2-methoxy- and 2-methylphenols

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