Impact of Positional Isomers on the Selective Isolation of cis-trans Isomers in Cobalt-Dioxolene Chemistry and Solvation Effects on the Valence Tautomerism in the Solid State

The reaction of (THT)AuCl with (TMEDA)Na[N(TePR2)2] (R = Ph, i-Pr, t-Bu) produces a series of gold (III) complexes of the type [{R2PNP(Te)R2}Au(µ-Te)]2 (4a, R = i-Pr; 4b, R = Ph; 4c, R = t-Bu) rather than the expected homoleptic Au(I) complexes of the ditelluridoimidodiphosphinate ligands. A combination of solution- and solid-state NMR studies shows that both cis and trans isomers of 4a–4c are formed in these reactions. X-ray structural determinations of the trans isomers of 4a–4c reveal a centrosymmetric arrangement with a central four-membered Au2Te2 ring formed by the formal insertion of gold into a P–Te bond; this insertion process was shown to be reversible upon addition of PPh3 to 4a to give the monomeric gold(I) complex Ph3PAu[N{TeP(i-Pr)2}2]. The X-ray structure of cis-4b is also described.Key words: gold, tellurium, redox, X-ray structures, imidodiphosphinate.

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Synthesis of chiral trans-anti-trans-isomers of dicyclohexano-18-crown-6 via an enzymatic reaction and the solid-state structure of one enantiomer

Tetrahedron Letters ◽

10.1016/s0040-4039(02)01187-5 ◽

2002 ◽

Vol 43 (33) ◽

pp. 5805-5808 ◽

Cited By ~ 8

Author(s):

Kazuhiro Yamato ◽

Richard A. Bartsch ◽

Grant A. Broker ◽

Robin D. Rogers ◽

Mark L. Dietz

Keyword(s):

Solid State ◽

Enzymatic Reaction ◽

State Structure ◽

Trans Isomers ◽

Solid State Structure

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Aggregation-enhanced emissive mechanofluorochromic carbazole-halogen positional isomers: tunable fluorescence via conformational polymorphism and crystallization-induced fluorescence switching

CrystEngComm ◽

10.1039/c9ce01227c ◽

2019 ◽

Vol 21 (43) ◽

pp. 6604-6612 ◽

Cited By ~ 1

Author(s):

Parthasarathy Gayathri ◽

Subramanian Karthikeyan ◽

Mehboobali Pannipara ◽

Abdullah G. Al-Sehemi ◽

Dohyun Moon ◽

...

Keyword(s):

Solid State ◽

Positional Isomers ◽

Conformational Polymorphism ◽

Fluorescence Switching ◽

Solid State Fluorescence

The conformational twist of the carbazole-halogen positional isomers produced blue and green polymorphs with tunable solid-state fluorescence and demonstrated mechanofluorochromism.

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Incorporation of Positional Isomers of cis- and trans-Octadecenoic Acids into the Acyl Lipids of Cultured Soya Cells

Zeitschrift für Naturforschung C ◽

10.1515/znc-1978-3-426 ◽

1978 ◽

Vol 33 (3-4) ◽

pp. 303-304 ◽

Cited By ~ 4

Author(s):

Ingolf Richter ◽

Nikolaus Weber ◽

Helmut K. Mangold ◽

Kumar D. Mukherjee

Keyword(s):

Fatty Acids ◽

Cell Suspension ◽

Cell Suspension Cultures ◽

Suspension Cultures ◽

Positional Isomers ◽

Trans Isomers ◽

Trans Isomerization ◽

Acyl Lipids ◽

Octadecenoic Acids ◽

Cis And Trans

Cell suspension cultures of soya were incubated with cis-[1-14C]octadecenoic acids and trans- [1-14C]octadecenoic acids, each of known composition with regard to positional isomers. Each of the positional isomers ranging from ⊿8- to ⊿15-as-octadecenoic acids and ⊿7- to ⊿16-frans-octadecenoic acids was readily incorporated into the acyl lipids of the cells, yet, the ⊿9 cis- and the ⊿9-trans-isomers were the preferred substrates, cis-trans Isomerization did not occur during the incorporation of the fatty acids into the acyl lipids.

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cis/trans Isomers of Dimeric Dialkylaluminum and Dialkylgallium Hydrazides

Zeitschrift für Naturforschung B ◽

10.1515/znb-2008-1002 ◽

2008 ◽

Vol 63 (10) ◽

pp. 1149-1154 ◽

Cited By ~ 9

Author(s):

Werner Uhl ◽

Andreas Vogelpohl

Keyword(s):

Solid State ◽

Equilibrium Mixture ◽

Trans Configuration ◽

Trans Isomers ◽

Tert Butyl ◽

Hydrazine Derivatives ◽

Piperidine Derivative ◽

Cis And Trans Isomers ◽

Gallium Hydride ◽

Cis And Trans

AbstractThe reaction of diethylaluminum hydride with the hydrazine derivatives 1-aminopyrrole and 1- aminopiperidine afforded the corresponding dialkylaluminum hydrazides (1 and 2) by the release of elemental hydrogen. Both products are dimeric in the solid state. While 1 adopts a cis arrangement of the pyrrole groups, a trans configuration was determined for the piperidine compound 2. Only 1 gives an equilibrium mixture of cis and trans isomers in solution. Similar compounds (3 and 4) were obtained by the treatment of the same hydrazines with di(tert-butyl)gallium hydride. Both products exhibit the trans configuration in the solid state, but interestingly only the piperidine derivative 4 shows a cis/trans equilibrium in solution.

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