Environmental monitoring system

The developed project is a prototype of system that allows to control the ecological situation, the amount of waste and emissions at the plant, in the city or in the region, provide data of geolocation, process, analyze, store, and report data and to simulate and predict the situation in which occurs the norm excess or It becomes a real threat to environmental safety and to notify it in advance.Разработанный проект представляет собой прототип системы, позволяющей контролировать экологическую ситуацию, объем отходов и вредных выбросов на предприятии, в городе или регионе, предоставлять данные геолокации, обрабатывать, анализировать, хранить и представлять данные, а также моделировать и прогнозировать ситуации, при которых произойдет превышение нормы или станет реальной угроза экологической безопасности и заранее уведомлять об этом

Ligand and solvent control of selectivity in the C–H activation of a pyridylimine-substituted 1-naphthalene; a combined synthetic and computational study

The pyridylimine-substituted 1-naphthalenes, 2-(1-C10H7)-6-{CR[double bond, length as m-dash]N(2,6-i-Pr2C6H3)}C5H3N (R = Me HLMe, H HLH), react with Na2[PdCl4] in acetic acid at elevated temperature to afford either ortho-C–Hnaphthyl activated (LMe)PdCl (2ortho) or the unactivated adduct (HLH)PdCl2 (1b). Alternatively, 1b and its ketimine analogue (HLMe)PdCl2 (1a), can be prepared by treating (MeCN)2PdCl2 with either HLMe or HLH in chloroform at room temperature. Regio-selective ortho-C–H activation to form 2ortho can also be initiated by the thermolysis of 1a in acetic acid, while no reaction occurs under similar conditions with 1b. Interestingly, the C–H activation of HLMe to give 2ortho is found to be reversible with 100% deuteration of the peri-site occurring on reacting Na2[PdCl4] with HLMe in acetic acid-d4. By contrast, heating 1a in toluene gives a 55 : 45 mixture of 2ortho and its peri-activated isomer 2peri. Pure 2peri can, however, be obtained either from (LMe)PdOAc (3peri) by OAc/Cl exchange or by the sequential reactions of 1a with firstly silver acetate then with aqueous sodium chloride. Intriguingly, a peri to ortho interconversion occurs on heating 2peri in acetic acid to give 2ortho. DFT calculations have been used to investigate the C–H activation steps and it is found that in acetic acid ortho-C–H activation is kinetically and thermodynamically favoured but peri-CH activation is kinetically accessible (ΔΔG‡ = 2.4 kcal mol−1). By contrast in toluene, the reaction appears to be irreversible with the difference in barrier height for ortho- and peri-C–H activation being very small within the error of the method (ΔΔG‡ = 0.7 kcal mol−1), findings that are in agreement with the empirically observed product distribution for 2ortho and 2peri. Single crystal X-ray structures are reported for 1a, 1b, 2ortho and 2peri

Methyltrioxorhenium catalyzed oxidation of saturated and aromatic hydrocarbons by H2O2 in air

Alkanes (cyclohexane, cyclooctane, n-heptane) and aromatic compounds (benzene, toluene, and ethylbenzene) are oxidized by anhydrous H2O2 in MeCN in air in the presence of catalytic amounts of MTO. The reaction is accelerated by addition of pyrazine-2-carboxylic acid. Alkanes give alkyl hydroperoxides as main products, as well as alcohols and ketones. Arenes yield predominantly phenols. Copyright (C) 1996 Elsevier Science Ltd37366487649