RESULTS OF NEW RUSSIAN INTRAOCULAR LENSES IMPLANTATION

Purpose: to analyze the data obtained from a multicenter study of the hydrophobic IOL Citrin and a hydrophilic IOL Aquamarine implantation and a comparison of the Acrysoft IQ with Citrine and IOL by the given parameters.Patients and methods. A total of 100 IOLs produced by NanOptic (96 hydrophobic IOLs Citrine and 4 hydrophilic IOLs Aquamarine) and 24 IOL Acrysoft IQ were implanted. 7 ophthalmological clinics in different Russian cities took part in the study. The observation period was from 1 to 10 months. The indication for phacoemulsification was age cataract in 99 cases (99 eyes). The clear lens was removed for refractive purpose in one patient (2 eyes) with high degree of myopia. The age of the patients was 34–81. The basic examination was made for patients before the operation. The mean uncorrected visual acuity before the operation was (UCVA) 0.13±0.14 (0.001–0.6), the average corrected visual acuity (BVVA) was 0.32±0.28 (0.001–0.85). All patients underwent standard phacoemulsification.Results. There were no complication in the early postoperative period. In the postoperative period, the mean UCVA was 0.52±0.24 (0.2–1.0), the mean VCVA was 0.75±0.24 (0.3–1.0). In all cases, the refraction obtained was consistent with the prediction. The error in calculating the IOL was minimal and permissible. In 72% cases, the threshold contrast sensitivity was normal or slightly decreased. In some cases, there were difficulties in implantation of a hydrophobic IOL. At the same time, difficulties in implanting the hydrophilic IOL weren’t registered.Conclusions. The first results of implantation of new Russian IOLs on the given parameters appeared to be satisfactory. Further research, including the dynamic long term observation of the implantation results is required

Kinetics and mechanism of the oxidation of alkyl substituted phenols and naphthols with tBuOOH in the presence of supported iron phthalocyanine

BIOVERT+ASO:IVA:OZANon

Mechanistic study on the oxidation of functionalized phenols and naphthols in Ti-MMM-2 / H2O2 and FePcS-SiO2 / tBuOOH systems

internationa

Hydrocarbon oxidation over Fe- and Cr-containing metal-organic frameworks MIL-100 and MIL-101-a comparative study

SSCI-VIDE+CDFA+ISK:IVA:ASOInternational audienceCatalytic properties of Fe- and Cr-based metal-organic frameworks (MOFs) MIL-100 and MIL-101 have been assessed in two liquid-phase reactions: solvent-free allylic oxidation of alkenes (cyclohexene, alpha- and beta-pinenes) with molecular oxygen and oxidation of anthracene (AN) with tert-butyl hydroperoxide(TBHP). In the oxidation of alkenes, the product selectivity strongly depends on the nature of metal (Fe or Cr) but, for the same metal, only slightly differs for the MIL-100 and MIL-101 structures. The Fe- containing MOFs afford the formation of unsaturated alcohols while Cr-based MOFs give mainly unsaturated ketones. Both Cr-MIL-100 and Cr-MIL-101 favor decomposition of cyclohexenyl hydroperoxide to produce 2-cyclohexen-1-one with 67-69% selectivity. Stability toward destruction reduced in the order Cr-MIL-101, Cr-MIL-100 > Fe-MIL-100 > Fe-MIL-101. In the oxidation of anthracene over both Cr-MOFs and Fe-MIL-101, the selectivity toward 9,10-anthraquinone (AQ) attained 100% at 92-100% AN conversion. The turnover frequency (TOF) decreased in the order Cr-MIL-101 > Fe-MIL-101 > Cr-MIL-100 > Fe-MIL-100. Cr-MIL-101 revealed superior catalytic performance in terms of AN conversion, AQ selectivity and TOF. Nearly quantitative yield of AQ was obtained after 1.5 h at 100 degrees C in chlorobenzene as solvent. No leaching of active metal occurred under optimal reaction conditions and the MOFs could be recycled several times without deterioration of the catalytic properties. (C) 2014 Elsevier B.V. All rights reserved

Highly Selective Oxidation of Alkylphenols to <i>p</i>‑Benzoquinones with Aqueous Hydrogen Peroxide Catalyzed by Divanadium-Substituted Polyoxotungstates

The catalytic performance of divanadium- and dititanium-substituted γ-Keggin polyoxotungstates, TBA₄H­[γ-PW₁₀V₂O₄₀] (<b>I</b>, TBA = tetra-<i>n</i>-butylammonium), TBA₄H₂[γ-SiW₁₀V₂O₄₀] (<b>II</b>), and TBA₈[{γ-SiW₁₀Ti₂O₃₆(OH)₂}₂(μ-O)₂] (<b>III</b>) has been assessed in the selective oxidation of industrially important alkylphenols/naphthols with the green oxidant 35% aqueous H₂O₂. Phosphotungstate <b>I</b> revealed a superior catalytic performance in terms of activity and selectivity and produced alkylsubstituted <i>p</i>-benzo- and naphthoquinones with good to excellent yields. By applying the optimized reaction conditions, 2,3,5-trimethyl-<i>p</i>-benzoquinone (TMBQ, vitamin E key intermediate) was obtained in a nearly quantitative yield via oxidation of 2,3,6-trimethylphenol (TMP). The efficiency of H₂O₂ utilization reached 90%. The catalyst retained its structure under turnover conditions and could be recycled and reused. An active peroxo vanadium complex responsible for the oxidation of TMP to TMBQ has been identified using ⁵¹V and ³¹P NMR spectroscopy

EPR study on the mechanism of H2O2-based oxidation of alkylphenols over titanium single-site catalysts

International audienc