Origin of the Elements. Isotopes and Atomic Weights

Greenwood, N. N.; Earnshaw, A.

doi:10.1016/b978-0-08-030712-1.50004-1

Cited by 121 publications

(119 citation statements)

References 8 publications

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“…At substrate amounts higher than the optimum amounts, the labeling yield reached plateau. This may be attributed to the fact that the yield reaches the saturation value because the entire generated iodonium ions [I + ] in the reaction were captured at concentration of 0.5 mg. 25 Effect of the oxidizing agent amount (Table 4). Radioiodination of compound 5 has been performed by using NBS as a mild oxidizing agent to transform iodide (I -) to iodinium ion (I + ), which allows a spontaneous electrophilic substitution on aromatic ring.…”

Section: Results Of the Synthesis Of 125 I-tpmentioning

confidence: 99%

Synthesis, Labeling and Biological Evolution of New Thiopyrano[2,3-b]Pyridine Derivatives as Potential Anticancer Agents

Sofan

Hamama

EL-Hawary

et al. 2019

ACSi

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The new thiopyrano[2,3-b]pyridines 4-9 could be synthesized from the nicotinonitrile derivative 1. The cytotoxicity activity of the selected compounds 5, 6 and 8 was tested against MCF-7 and HCT-116 cell lines. The compound 5 (TP 5) exhibited significant inhibitory activity and displayed the most potent activity, more than 6 and 8. The compound 5 with potent inhibitory activity in tumor growth inhibition would be a potential anticancer agent. In the light of this result, the labeled 125 I-compound 5 (125 I-TP 5) was prepared and its cytotoxicity against ascites tumor in mice has been evaluated. The results show that compound 5 (TP 5) may be potentially used as a radiopharmaceutical for tumor diagnosis when labeled with 125 I.

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Section: Results Of the Synthesis Of 125 I-tpmentioning

confidence: 99%

Synthesis, Labeling and Biological Evolution of New Thiopyrano[2,3-b]Pyridine Derivatives as Potential Anticancer Agents

Sofan

Hamama

EL-Hawary

et al. 2019

ACSi

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“…Aluminium oxide surface layers in aqueous acetone medium are transformed under: ( 1 ) surface dissociation, ( 2 ) deprotonation and ( 3 ) dimerization via hydroxy-bridge joint into different kinds of ions and multinuclear cations respectively [25]: …”

Section: Resultsmentioning

confidence: 99%

“…The features of high reactivity of wet aluminium oxide surface with [Al(OH) 2 ] + or [Al(OH) 2 (H 2 O) 4 ]+ in aqueous acetone medium containing K 2 Cr 2 O 7 –H 2 SO 4 are due to: (i) anionic species of chromium derivatives with betulin; (ii) formation of inclusion complexes of reduced Cr 3+ -ions; (iii) solid solution due to replacement of Cr 3+ –Al 2 O 3 [25,26]. …”

Section: Resultsmentioning

confidence: 99%

“…Dichromate-ion may exist as the following forms: Cr 2 O 7 2− , HCrO 4 − , HCr 2 O 7 − . Lately HCr 2 O 7 − has been considered as the main particle in K 2 Cr 2 O 7 –H 2 SO 4 system [25,26]. …”

Section: Resultsmentioning

confidence: 99%

“…In aqueous acetone the base was considered to be water. Some reports consider chromium oxidation in acid medium as a process of conversion to the protonated bimetallic chromium (VI) species, resultant in the formation of the monochromate ester which, under the decomposition in the rate-determining step, to give the product [25,27]. Monitoring the absorption at 360 nm in time A = f (τ) in the initial reaction mixtures was studied.…”

Section: Resultsmentioning

confidence: 99%

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A Practical Synthesis of Betulonic Acid Using Selective Oxidation of Betulin on Aluminium Solid Support

et al. 2012

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The room temperature oxidation of betulin by Cr(VI) compounds in aqueous acetone on solid supports such as alumina, zeolites and silica gel has been studied. The oxidation on alumina support leaded to a single product—betulonic acid—in quantitative yield. One hundred percent selective oxidation during 30 min of betulin up to betulonic aldehyde was determined when silica gel support was used. The oxidation of betulin using zeolites as a support gives a mixture of betulonic acid and aldehyde in a 2:1 ratio. It is proposed the selective oxidation up to betulonic acid is due to the influence of Al3+-ions.

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Deformation and Bonding in a Puckered Re—C Square Net

S¹,

Courtney²,

Hoffmann³

2002

Z. anorg. allg. Chem.

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Sc 5 Re 2 C 7 contains unusual ReϪC puckered "square" nets, isolated C 3 units, and scandium ions.Its electron count drives the peculiar distortion of the ReϪC nets, resulting in quite different ReϪC and ReϪRe bonding along each direction. Indeed, some of the ReϪC interactions emerge as stronger than double bonds.The puckering, in turn, enables a bonding role for the scandium atoms Deformation und Bindung in einem gefalteten quadratischen Re؊C-NetzInhaltsübersicht. Sc 5 Re 2 C 7 enthält ungewöhnliche "quadratische" ReϪC-Netze, isolierte C 3 -Einheiten und Scandium-Ionen. Die Anzahl seiner Elektronen bestimmt die besondere Verzerrung der ReϪC-Netze, was ganz verschiedene ReϪC-und ReϪRe-Bindungen in jeder Richtung zur Folge hat. Tatsächlich erscheinen einige

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Origin of the Elements. Isotopes and Atomic Weights

Cited by 121 publications

References 8 publications

Synthesis, Labeling and Biological Evolution of New Thiopyrano[2,3-b]Pyridine Derivatives as Potential Anticancer Agents

Synthesis, Labeling and Biological Evolution of New Thiopyrano[2,3-b]Pyridine Derivatives as Potential Anticancer Agents

A Practical Synthesis of Betulonic Acid Using Selective Oxidation of Betulin on Aluminium Solid Support

Deformation and Bonding in a Puckered Re—C Square Net

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