Group 13 Decamethylmetallocenium Cations

Salts containing the decamethylmetallocenium cations, [( C5Me5) M-2](+) ( or Cp*M-2(+)) of the group 13 "metals" B, Al and Ga have been prepared using a variety of synthetic routes. Precursor molecules of the type Cp*2MX ( X = Cl, Br, Me) exhibit structural features that vary significantly depending on the size and electronegativity of the central atom. While salt metathesis, halide abstraction and methanide abstraction methods represent viable routes for the preparation of salts of Cp*B-2(+) and Cp*Al-2(+), acidolysis of a Cp* group from Cp*Ga-3 is the most reliable method for the synthesis of the analogous gallium cation. Gallocenium cations are less stable than either of the lighter congeneric cations since they prove to be susceptible to decomposition reactions involving the "back-transfer" of ligands from the counter anion. Density functional theory (DFT) calculations revealed that, whereas Cp*Ga-2(+) is predicted to adopt a molecular structure more similar to that of Cp*B-2(+), the electronic structure of the gallium cation bears a greater resemblance to that of Cp*Al-2(+).Chemistr

Single nucleotide polymorphism upstream of interleukin 28B associated with phase 1 and phase 2 of early viral kinetics in patients infected with HCV genotype 1

We studied the relationship between IL28B gene-related SNP rs12979860 and early viral kinetics (day 0–28) during peginterferon and ribavirin treatment, in 173 African Americans (AA) and 188 Caucasian Americans (CA) with HCV genotype 1

A Phase II Trial of Sorafenib in Metastatic Melanoma with Tissue Correlates

Sorafenib monotherapy in patients with metastatic melanoma was explored in this multi-institutional phase II study. In correlative studies the impact of sorafenib on cyclin D1 and Ki67 was assessed. mutational status and clinical activity. No significant changes in expression of cyclin D1 or Ki67 with sorafenib treatment were demonstrable in the 15 patients with pre-and post-treatment tumor samples. mutational status of the tumor was not associated with clinical activity and no significant effect of sorafenib on cyclin D1 or Ki67 was seen, suggesting that sorafenib is not an effective BRAF inhibitor or that additional signaling pathways are equally important in the patients who benefit from sorafenib

Patient-reported outcome measures of the impact of cancer on patient’s everyday lives: a systematic review

Purpose: Patients with advanced disease are living longer and commonly used patient-reported outcome measures (PROMs) may miss relevant elements of the quality of extended survival. This systematic review examines the measures used to capture aspects of the quality of survival including impact on patients’ everyday lives such as finances, work and family roles. Methods: Searches were conducted in MEDLINE, EMBASE, CINAHL and PsycINFO restricted to English language articles. Information on study characteristics, instruments and outcomes was systematically extracted and synthesised. A predefined set of criteria was used to rate the quality of studies. Results: From 2761 potentially relevant articles, 22 met all inclusion criteria, including 10 concerning financial distress, 3 on roles and responsibilities and 9 on multiple aspects of social well-being. Generally, studies were not of high quality; many lacked bias free participant selection, had confounding factors and had not accounted for all participants. High levels of financial distress were reported and were associated with multiple demographic factors such as age and income. There were few reports concerned with impacts on patients’ roles/responsibilities in everyday life although practical and emotional struggles with parenting were identified. Social difficulties were common and associated with multiple factors including being a caregiver. Many studies were single time-point surveys and used non-validated measures. Exceptions were employment of the COST and Social Difficulties Inventory (SDI), validated measures of financial and social distress respectively. Conclusions: Impact on some important parts of patients’ everyday lives is insufficiently and inconsistently captured. Further PROM development focussing on roles and responsibilities, including work and caring for dependents, is warranted. Implications for Cancer Survivors: Factors such as finances, employment and responsibility for caring for dependents (e.g. children and elderly relatives) can affect the well-being of cancer survivors. There is a need to ensure that any instruments used to assess patients’ social well-being are broad enough to include these areas so that any difficulties arising can be better understood and appropriately supported

Structural Characterization and Redox Activity of a Uranyl Dimer and Transition-Metal Complexes of a Tetradentate BIAN Ligand

The synthesis and characterization of a new ligand system combining the redox-active backbone of Ar-BIANs (<i>N</i>,<i>N</i>′-bis­[(aryl)­imino]­acenaphthenes) and a mixed-donor O–N–N–O salen-type binding pocket is reported. Complexes of Co²⁺, Ni²⁺, and UO₂²⁺ were prepared and characterized through single-crystal X-ray diffraction and electrochemical studies. The Ni²⁺ and Co²⁺ complexes have been used as references against which to compare the unique behaviors exhibited by the uranyl (UO₂²⁺) complex, as the latter forms two distinct solid-state structures with unusual oxo contacts to CH₂Cl₂ and CHCl₃ and displays a rich electrochemical profile that indicates a wide range of accessible metal oxidation states through the formation of mixed-valent U­(VI)/U­(V) and U­(V)/U­(IV) species in solution

Structural Characterization and Redox Activity of a Uranyl Dimer and Transition-Metal Complexes of a Tetradentate BIAN Ligand

The synthesis and characterization of a new ligand system combining the redox-active backbone of Ar-BIANs (<i>N</i>,<i>N</i>′-bis­[(aryl)­imino]­acenaphthenes) and a mixed-donor O–N–N–O salen-type binding pocket is reported. Complexes of Co²⁺, Ni²⁺, and UO₂²⁺ were prepared and characterized through single-crystal X-ray diffraction and electrochemical studies. The Ni²⁺ and Co²⁺ complexes have been used as references against which to compare the unique behaviors exhibited by the uranyl (UO₂²⁺) complex, as the latter forms two distinct solid-state structures with unusual oxo contacts to CH₂Cl₂ and CHCl₃ and displays a rich electrochemical profile that indicates a wide range of accessible metal oxidation states through the formation of mixed-valent U­(VI)/U­(V) and U­(V)/U­(IV) species in solution

Catalysis of Alkene Epoxidation by a Series of Gallium(III) Complexes with Neutral N‑Donor Ligands

Six gallium­(III) complexes with N-donor ligands were synthesized to study the mechanism of Ga^III-catalyzed olefin epoxidation. These include 2:1 ligand/metal complexes with the bidentate ligands ethylenediamine, 5-nitro-1,10-phenanthroline, and 5-amino-1,10-phenanthroline, as well as 1:1 ligand/metal complexes with the tetradentate <i>N</i>,<i>N</i>′-bis­(2-pyridylmethyl)-1,2-ethanediamine, the potentially pentadentate <i>N</i>,<i>N</i>,<i>N</i>′-tris­(2-pyridylmethyl)-1,2-ethanediamine, and the potentially hexadentate <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetrakis­(2-pyridylmethyl)-1,2-ethanediamine. In solution, each of the three pyridylamine ligands appears to coordinate to the Ga^III through four donor atoms. The six complexes were tested for their ability to catalyze the epoxidation of alkenes by peracetic acid. Although the complexes with relatively electron-poor phenanthroline derivatives display faster initial reactivity, the gallium­(III) complexes with the polydentate pyridylamine ligands appear to be more robust, with less noticeable decreases in their catalytic activity over time. The more highly chelating trispicen and tpen are associated with markedly decreased activity