A general empirical relationship has been developed for estimating the cloud point of pure nonionic surfactants of the alkyl ethoxylate class. For a set of 62 structures, composed of linear alkyl, branched alkyl, cyclic alkyl, and alkylphenyl ethoxylates, cloud points can be estimated to an accuracy of ±6.3°C (3.7°C median error) using the logarithm of the number of ethylene oxid...

The oxidation and degradation of hydrocarbons at high temperature and pressure in the presence of oxygen is one of the common oil product problems. There are many antioxidants to prevent or inhibit oxidation processes; molybdenum and zinc dithiocarbamates are known as powerful antioxidants. In this paper, the oxidation inhibition time of cumene has been investigated using zinc and molybdenum di...

We have developed a new method for automated production of 2-[18F]fluoroethyl tosylate ([18F]FETos) that enables 18F-alkylation to provide PET tracers with high chemical purity. The method is based on the removal of excess ethylene glycol bistosylate precursor by precipitation and subsequent filtration and purification of the filtrate by means of solid phase extraction cartridges (SPE). The met...

Alkyl-branched fatty compounds are of interest for industrial products in the cosmetics and lubricant areas. In this review, clayand zeolite-catalyzed isomerizations of unsaturated fatty compounds, especially of oleic acid, are discussed. While clay-catalyzed reactions give most complex mixtures of dimeric fatty acids and of monomeric so-called “isostearic acid”, the zeolite-catalyzed process y...

The comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry (GC × GC/TOFMS) has been used to characterize a crude oil and a source rock extract sample. During the process, a series of pairwise components between monocyclic alkanes and mono-aromatics have been discovered. After tentative assignments of decahydronaphthalene isomers, a series of alkyl decalin isomers have...

Stretchable conductors and organic electrochemical transistors (OECT) were fabricated from PEDOT:Tos (poly (3,4-ethylenedioxythiophene):iron tosylate) nanofibers. The devices prepared by a combination of electrospinning electrode printing followed vapor phase polymerization (VPP). impact both the processing time composition three mixtures on electrospun fiber mats was evaluated scanning electro...

The binding data for interaction of a homologous series of n-alkyl sulfates with alkyl chainlengths from C8 to C12 with insulin were analyzed on basis of Hill equation for two classes ofbinding sites .The intrinsic Gibbs free energies were calculated and resolute on basis ofelectrostatic and hydrophobic contributions The estimation of these contributions reveals themajor role of electrostatic i...

2-Alkyl-1-alkylthioisoquinolinium salts were readily prepared from 2-alkyl-1(2H)-isoquinolones via 2-alkyl1(2H)-thioisoquinolones in two steps. Under mild conditions, the reaction of 2-alkyl-1-alkylthioisoquinolinium salts with active methylene compounds in the presence of sodium hydride afforded 2-alkyl-1-(substituted methylene)iso-quinolines in good yields. Pyrrolo[2,1-a]isoquinolines were sy...

BRETYLIUM tosylate (Darenthin, Burroughs Wellcome), is one of the series of benzyl quaternary ammonium compounds which blocks selectively the peripheral sympathetic nervous system without antagonizing the effects of epinephrine. This block occurs without depression of the parasympathetic or central nervous system.' Its effect on the pulmonary circulation has not hitherto been investigated. ,_ ....