The catalytic oxidation of ethylene by N2O mediated by atomic alkaline-earth metal cations has been investigated both experimentally and theoretically. An ICP/SIFT tandem mass spectrometer was employed to measure the kinetics and product distributions of the reactions of CaO+, SrO+ and BaO+ with...
The adsorptive voltammetric behaviour of BE(II) at a hanging mercury drop electrode (HMDE) in the presence of Beryllon III was investigated in NH3-NH4Cl (pH 9.7) solution. The results show that the BE(II) complex with Beryllon III can be adsorbed on the surface of the HMDE, yielding on peak -∮....
Beryllium for isotopic analysis by accelerator mass spectrometry (AMS) can be extracted efficiently from geological materials using a procedure based on fusion with a mixture of KHF2 and Na2SO4. In the presence of this flux, Be forms the fluoroberyllate anion (BeF42−), freely extractable into ho...
The atomic fluorescence of beryllium has been observed. A high-intensity beryllium hollow-cathode lamp was used as the source. Oxy-acetylene and nitrous oxide-acetylene flames were studied. A newly designed burner assembly for nitrous oxide-acetylene flames used for atomic fluorescence studies i...
Beryllium silicates having the ZSM-5-type crystalline structure were synthesized in the presence of tetraethylammonium hydroxide. The chemical shifts in the 9Be NMR spectra show that Be2+ cations in these synthesized samples are located in a tetrahedral coordination different from that for Be2+ ...
Publisher SummaryThis chapter discusses aqueous solution chemistry of beryllium. Complexes of the beryllium ion are always 4-coordinate with, at most, minor deviations from regular tetrahedral geometry. The tetra-aqua ion is a very stable entity and substitution of one or more water molecules by...
Intrinsic hydroformylation kinetics have been measured in a high-throughput kinetic test setup at temperatures varying from 448 to 498 K, with the total pressure ranging from 1 to 3 MPa. A gaseous feed containing CO, C2H4 and H2 was used with space times varying from 2.7 kgcat s/molC2H4,in to 14...
Publisher SummaryThe hydrolysis and formation of esters have been extensively studied than any other chemical reaction. This chapter brings together in one place a representative selection of the data to set them in the perspective of an overall view of the subject and to offer the interpretatio...
The separation of 17 chiral sulfoxides and eight chiral sulfinate esters by gas chromatography (GC) on four derivatized cyclodextrin chiral stationary phases (CSPs) (Chiraldex™ G-TA, G-BP, G-PN, B-DM) is presented. Many of these compounds are structural isomers or part of a homologous series. Di...
Reaction of monomers, polymers and copolymers containing monothio-orthoester groups with meta-chloroperoxybenzoic acid in CH2Cl2 at 20°C affords the corresponding S-oxides. The chemoselective conversion of alkythio group into a sulfoxide moiety was achieved with monomers, polymers and copolymer...
The influence of poly(vinyl chloride) on poly(ethylene terephthalate) pyrolysis was investigated. Products of degradation of this two-polymer mixture were separated by gas chromatography and chloroorganic components were identified. Chloroesters of terephthalic and benzoic acids were found. Mass...
A novel synthetic approach, leading to the formation of hetero-telechelic precursors and multiblock copolymers composed of vinyl polymer [polystyrene or poly(N,N-dimethylacryl amide)] blocks and condensation linkages (ester or amide) or its polycondensate blocks, was developed using iniferters c...
One of the main drawbacks of the use of biodiesel is its bad behavior at low temperatures. In this work, we show that it is possible to take profit of the presence of free fatty acids in the starting materials used for biodiesel production (i.e. reused oils) by synthesizing additives able to imp...
Publisher SummaryThe 2-propene group is commonly referred to as the “allyl group.” Many natural and artificial flavoring agents contain allyl derivatives. Allyl esters are found in many perfumes. Since allyl compounds are capable of free-radical polymerization, they are used in a number of cop...
An approach to the synthesis of 3-phenyl-5-vinyl substituted prolines starting from readily available 2,3-disubstituted pentenoic acid derivatives is reported. The route converts the pentenoic acid derived starting materials into cyclic N-acyliminium ion precursors with the use of a hydroboratio...
The scarcity of fossil fuels in medium and long term has led to several researchers to propose different alternatives to replace them, where the biodiesel had been proposed as the main replacement of conventional diesel oil. The main technical problem of this fuel is that doesn´t have an adequa...
2-Fluoroalk-1-en-3-ols (4), available from terminal alkenes (1) by bromofluorination, subsequent dehydrobromination of the 1-bromo-2-fluoroalkanes (2) to form 2-fluoroalkenes (3) and selenium dioxide mediated allylic oxidation with tert-butylhydroperoxide, undergo Johnson-Claisen rearrangement o...
The radical copolymerization of ortho-methacryloyloxybenzoic acid with methyl methacrylate and vinyl chloride has been studied at low conversions. The reactivity ratios of these comonomeric pairs have been determined by the application of Fineman-Ross and Kelen-Tüdös methods. The values obtaine...
The thermal behaviour of poly(o-methacryloyloxybenzoic acid) has been studied by means of dynamic and isothermal thermogravimetric analysis in the range 100–600°C, and infra-red spectroscopy. The results suggest that the initial step in the degradation of the polymer in the range 140–220°C i...
The authors have made a calorimetric study of the thermodynamic properties of p-methacryloyloxybenzoic acid and poly-p-methacryloyloxybenzoic in the region 0–500 K. They have measured the thermal capacity Cp0, the temperatures and enthalpies of the physical transitions and determined the enthal...
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