Synthesis of three stereoisomers of p-tert-butylthiacalix[4]arene substituted with (ethoxycarbonyl)methoxy and fluorescent 1-amidoanthraquinone fragments

© ISUCT Publishing.New tetrasubstituted at the lower rim thiacalix[4]arenes containing both (ethoxycarbonyl)methoxy and 1-amidoanthraquinone fragments in three conformations: cone, partial cone and 1,3-alternate were synthesized. It was shown that depending on the alkali metal cation (sodium, potassium or cesium) in the alkylation of the diester based on p-tert-butylthiacalix[4]arene by 2-bromo-N-(9',10'-dioxo-9',10'-dihydroanthracene-1'-yl)acetamide template effect of metal cation was observed. The fluorescent properties of the obtained compounds were studied

About the Genesis of Pumice Deposits in the Region of Tarbagania and Pemzovaya Mountains in Kamchatka

В работе обсуждаются результаты изучения пемзовых отложений, расположенных в промежутке между вулканами Горелый и Мутновский на Камчатке. Приведены схема распространения пемзовых покровов и результаты петрохимических и геохимических исследований пемз и кислых лав. Выявлен ряд петрогеохимических особенностей пемз, указывающих на их вероятную генетическую обособленность.This paper discusses the results of study of pumice deposits between volcanoes Gorely and Mutnovskiy on Kamchatka. A scheme of the pumice sheets is presented. The results of petrochemical and geochemical studies of pumice and acidic lavas of Mutnovsky and Gorely are discussed. A number of petrogeochemical pumice features indicating their possible genetic isolation is revealed

Phosphorylation of p-tert-butyl(thia)calixarenes by ethylene chlorophosphite

The one-step synthesis of a macrocyclic node was performed by the interaction of thiacalix[4]arene with ethylene chlorophosphite; new cyclic derivatives of calix[n]arenes containing phosphorus fragments at the lower rim in the 1,2- (n=4) and 1,2,3-alternate (n=6) configurations were obtained. © 2012 Mendeleev Communications. All rights reserved

Selective transmembrane carriers for hydroxycarboxylic acids: Influence of a macrocyclic calix[4]arene platform

Selective transmembrane carriers for a-hydroxy acids, acyclic a-amino phosphonates and calix[4]arenes containing a-aminophosphonate substituents at the lower rim have been synthesized; analytical HPLC has been used to monitor the selective separation of dicarboxylic, a-hydroxy and a-amino acid mixtures by membrane extraction; the attachment of a-aminophosphonate fragments to the macrocyclic calix[4]arene platform results in receptors with markedly modified efficiency and selectivity relative to those of only aminophosphonates. © 2012 Mendeleev Communications. All rights reserved

Kinetics and mechanism of the pudovik reaction in the azomethine series: II.1 Hydrolysis and catalysis in the reaction of dialkyl phosphites with benzalaniline

A 31P NMR study show that diisopropyl phosphite and benzalaniline do not react with each other as individual components. Adduct formation is made possible by partial hydrolysis of the dialkyl phosphite

Phosphorus-bridged calixarene phosphites: Dramatic influence of a tert-butyl group at the upper rim of the macrocycle upon anion binding

New cyclic phosphite derivatives of calix[4]arenes in 1,2-alternate configuration were obtained by the interaction of calix[4]arenes with ethylene chlorophosphite; the influence of a tert-butyl group at the upper rim of the macrocycle upon anion binding was shown. © 2010 Mendeleev Communications. All rights reserved

Aminophosphonates: Synthesis and practical application

There is an increasing interest in amine derivatives of phosphonic acids. The α- aminophosphonates, organophosphorus analogs of natural amino acids are most studied and attracted for the specialists in various branches of chemistry - biochemists, pharmacologists and synthetic chemists. Phosphonates containing the amine group in the β-position are less studied but recent studies suggest they may be useful as bioactive species and receptor compounds. Phosphonic acid derivatives are not only biologically active compounds but also effective extractants and membrane carriers for various substrates (metal ions, organic and inorganic acids, etc.). Many of these advantages are due to the combination of several different binding sites, namely, proton donating (NH) and two proton accepting groups (P=O and a lone electron pair of the nitrogen atom), as well as the possibility of varying the lipophilicity and sterical loading of the binding site. The acceptor phosphoryl group of the β-aminophosphonates is farther away from the nitrogen than that of the α-aminophosphonates. Hence the increased basicity of the nitrogen atom leads to the peculiar transport properties of these compounds. This chapter discusses the main methods for synthesizing α- and β-amine derivatives of phosphonic acids, their biological activity and the application of these compounds as extractants and membrane carriers. © 2012 by Nova Science Publishers, Inc. All rights reserved

«Зеленый» кредит как инструмент «зеленого» финансирования

The article describes one of the main tools of green financing — the green loan. This is a loan designed for environmental projects related to agriculture, renewable energy sources, environmentally friendly industry, etc. The tasks are to analyze the current research on this topic, to study the regulatory aspects of green lending, its main types, impact on the bank economic indicators, advantages and disadvantages. The analysis of the current research has shown insufficient development of the idea of the green loan. It is only the theoretical aspect of its influence on the bank activities that has been defined, not its practical effect. The authors studied the green loan impact on the results of the bank activities on the example of overdue loans. For the analysis, they used the panel data of 10 out of 24 largest banks in China in 2012–2017. The evaluation is based on a random effects model. The calculations have been done by means of the generalized least-squares method in MSEXCEL. It has been revealed that green loans in the loan portfolio of the bank contribute to the overdue loans decrease. It has been determined that the main factors influencing the decision making by the borrower and the lender are reputation, public, equity and regulatory pressure, alternative capital pools, credit profiles, availability, capital requirements. However, there is no standard credit documentation for the green loan today. To make this financial tool efficient and sound, it is necessary to further develop regulations, to change approaches to disclosing information on sustainability issues in the non-financial part of annual reporting. The authors have made a conclusion about the rapid development and expansion of the green loan due to the flexible conditions for its provision and availability.В статье рассмотрен один из главных инструментов «зеленого» финансирования — «зеленый» кредит. Это кредит, предназначенный для экологических проектов, связанных с сельским хозяйством, возобновляемыми источниками энергии, экологически чистой промышленностью и др. Поставлены задачи: проанализировать существующие исследования по данной теме, исследовать регулирующие аспекты «зеленого» кредитования, его основные виды, влияние на экономические показатели банка, преимущества и недостатки. Анализ существующих исследований показал недостаточную проработку сущности «зеленого» кредита. Определен только теоретический аспект его влияния на деятельность банка без оценки практического эффекта. Авторы изучили влияние «зеленого» кредита на результаты работы банка на примере показателя просроченных кредитов. Для анализа использованы панельные данные десяти из 24 крупнейших банков Китая с 2012 по 2017 г. Оценка осуществлена на основе модели со случайными эффектами. Расчеты проведены с использованием обобщенного метода наименьших квадратов в MSEXCEL. Выявлено, что присутствие «зеленых» кредитов в кредитном портфеле банка способствует снижению показателя просроченных кредитов. Определено, что основными факторами, влияющими на принятие решения заемщиком и кредитором, являются репутация, общественное, акционерное и нормативное давление, альтернативные пулы капитала, кредитные профили, доступность, требования к капиталу. Однако сейчас отсутствует стандарт кредитной документации для «зеленого» кредита. Для эффективности и целесообразности данного финансового инструмента необходимо дальнейшее развитие нормативных регулирующих положений, изменение подходов к раскрытию информации по вопросам устойчивости в нефинансовой части в рамках годовой отчетности. Сделан вывод о быстром развитии и расширении практики использования «зеленого» кредита, что обусловлено гибкостью условий его предоставления и доступность

Synthesis and spatial structure of novel organosilicon derivatives of p-tert-butylthiacalix[4]arene from two-dimensional NMR data

New organosilicon derivatives of p-tert-butylthiacalix[4]arene with one or two ring fragments at the macrocycle lower rim were synthesized. The spatial structures of the resulting compounds were established by two-dimensional NMR spectroscopy. On going from the methyl substituents at the silicon atom to phenyl substituents, closure of the second silicon-containing ring is hampered because of steric hindrance in the reaction site. © 2007 Springer Science+Business Media, Inc

Synthesis and fluorescence properties of lower rim functionalized p-tert-butyl thiacalix[4]arenes containing anthraquinone and n,n-diethylacetamide fragments

It was shown that the chemo- and stereoselective alkylation of the lower rim 1,3-disubstituted p-tert-butyl thiacalix[4] arenes in the cone conformation using 2-chloro-N,N-diethylacetamide is determined by both the nature of the base and the position of the anthraquinone fragment in relation to the amide group: in the case of the 1-amidoanthraquinone derivative, tetrasubstituted products are produced, and in the case of the 2-amidoanthraquinone derivative, trisubstituted macrocycles are formed. It was established that the introduction of N,N-diethylacetamide fragments at the lower rim of 1,3-disubstituted macrocycles leads to an increase in the fluorescence intensity of the synthesized compounds. © ISUCT Publishing