Selective 1,4-additions (Michael reactions) on methyl vinyl ketone, methyl acrylate, simple and substituted chalcones by donors such as nitroalkane, malononitrile, diethylmalonate, cyanoacetamide and thiols were catalysed by solid base, modified Mg–Al hydrotalcite as catalyst in quantitative yields in...
also known as the chemical oxo (chem-oxo) process (Fig.1A). This catalyst-driven chemical process involves the addition of a formyl group and a hydrogen atom to propylene under pressure. Chemical production processes adopt one of two catalytic processes. One process involves a cobalt (Co)...
peak at −132.2 ppm attributed to inorganic fluoride appears, due to KF. In sum, NMR outcome confirms the rapid and entire mineralization of 6:2FTS in 1 h high energy ball milling. Additional analyses were conducted to identify intermediates and products of 6:2FTS MC destruction. ...
Conversion of alkanenitriles to amidines and carboxylic acids mediated by a cobalt(II)–ketoxime system. J. Chem. Soc. Perkin Trans. 2001, 1, 1569–1573. [Google Scholar] [CrossRef] Kopylovich, M.N.; Kukushkin, V.Y.; Haukka, M.; da Silva, J.J.R.F.; Pombeiro, A.J.L. ...
(9) and bromoalkane were added in a mixture of toluene and K2CO3(5 equiv.), then TBAHS (5–50% by mass of the starting material) were added. The reaction was brought to reflux at 105 °C from 2 to 6 h. After, the mixture was filtrated and evaporated. Purification on silica gel...
(Sapkota, 2020). Likewise, the alkanes have single bonding replicating the single bonds in saturated fatty acids, and alkenes, which have double bond replicating unsaturated fatty acids, which have double carbon bonding. When bromine is added into alkane solution, it does not react, thus ...
In comparison to the large published works regarding the evaluation of potential sources of hydrocarbons in marine sediments, n-alkane distributions with odd number preferences (C27, C29, C31) and/o...Ekpo B O, Oyo-Ita O E, Oros D R, et al. Sources of organic contaminants in solvents ...
spectra.The low yield of these products is evidently a consequence of the low yield of the diazoalkane. The diazoalkane ester insertion reaction, however, is so favoured that all the diazoalkane formed is converted into the noradamantane, even in the absence of a protic solvent.doi:10.1002/...
A postmarketing surveillance study has been conducted to evaluate the introduction of the MDI Seretide Evohaler™ (hydrofluoroalkane-134a inhaler containing salmeterol and fluticasone propionate). Objectives: To summarise the modified prescription-event monitoring (PEM) study conducted to evaluate the ...
Pyrolysates from the late glacial-early Holocene period, approximately mid-way down the core are characterised by distinct suites of long-chain n -alkene/ n -alkane doublets, which may reflect the selective preservation of recalcitrant aliphatic macromolecules and/or enhanced inputs of the algal ...