638-68-6Relevant academic research and scientific papers
WAX COMPOSITIONS COMPRISING LINEAR OLEFIN DIMERS OR HODROGENATED VARIANTS THEREOF AND METHODS FOR PRODUCTION THEREOF
-
Paragraph 0142-0149, (2021/09/17)
Wax compositions may be obtained by providing an olefinic feed comprising a first linear alpha olefin having m carbon atoms and a second linear alpha olefin having n carbon atoms, wherein m and n are independently selected integers each ranging from about 12 to about 100, and the olefinic feed optionally comprises one or more internal olefins and/or one or more branched olefins; contacting the olefinic feed with a metal carbene catalyst in a reactor; forming ethylene and a hydrocarbon substance comprising a linear olefin dimer comprising two carbon atoms less than a sum of m and n; removing the ethylene from the reactor while forming the linear olefin dimer; and isolating a wax composition comprising the linear olefin dimer, a hydrogenated reaction product thereof, or any combination thereof.
Photocatalytic degradation of ciprofloxacin by synthesized TiO2 nanoparticles on montmorillonite: Effect of operation parameters and artificial neural network modeling
Hassani, Aydin,Khataee, Alireza,Karaca, Semra
, p. 149 - 161 (2015/09/15)
TiO2/MMT nanocomposite was synthesized and characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray fluorescence (XRF) and Brunauer-Emmett-Teller (BET) techniques. The average size of TiO2 nanoparticles was decreased from 60-80 nm to 40-60 nm through the immobilization on MMT. The main influential factors such as the TiO2/MMT dose, ciprofloxacin (CIP) concentration, pH of the solution, UV light regions, reusability of the catalyst and electrical energy determination were studied. The addition of radical scavengers (e.g. chloride, iodide, sulfate and bicarbonate) and enhancers (e.g. hydrogen peroxide, potassium iodate and peroxydisulfate) on the degradation efficiency was studied. The predicted data from the designed artificial neural network model were found to be in a good agreement with the experimental data (R2 = 0.9864). The main intermediates of CIP degradation were determined by GC-Mass spectrometry.
Efficient heterogeneous dual catalyst systems for alkane metathesis
Huang, Zheng,Rolfe, Eleanor,Carson, Emily C.,Brookhart, Maurice,Goldman, Alan S,El-Khalafy, Sahar H.,Roy MacArthur, Amy H.
experimental part, p. 125 - 135 (2010/06/20)
A fully heterogeneous and highly efficient dual catalyst system for alkane metathesis (AM) has been developed. The system is comprised of an alumina-supported iridium pincer catalyst for alkane dehydrogenation/olefin hydrogenation and a second heterogeneous olefin metathesis catalyst. The iridium catalysts bear basic functional groups on the aromatic backbone of the pincer ligand and are strongly adsorbed on Lewis acid sites on alumina. The heterogeneous systems exhibit higher lifetimes and productivities relative to the corresponding homogeneous systems as catalyst/catalyst interactions and bimolecular decomposition reactions are inhibited. Additionally, using a two-pot device, the supported Ir catalysts and metathesis catalysts can be physically separated and run at different temperatures. This system with isolated catalysts shows very high turnover numbers and is selective for the formation of high molecular weight alkanes.
Long chain (C22-C50) polyunsaturated hydrocarbons, derivatives, synthesis and uses thereof
-
Page/Page column 21, (2009/09/08)
The present invention is directed to unsaturated or derivatized long chain (C22-C50) polyunsaturated hydrocarbons and a method of preparing the long chain hydrocarbons via electrocoupling of C12-C26 fatty acids. It has been found that soapstock is an inexpensive source of starting materials for the present method. The present invention is also directed to compositions comprising the long chain polyunsaturated hydrocarbons, which can be used as reactive diluents and modifiers in latex, epoxy, alkyd and polymer compositions. In another aspect, the present invention is directed to derivitization or ozonolysis of the long chain polyunsaturated hydrocarbons. The present method is also useful for preparing C12-26 alkyl esters and C12-26 carbon chain compounds containing a terminal olefin.
METHOD FOR THE PRODUCTION OF PRIMARY LONG-CHAIN ALCOHOLS
-
Page/Page column 8-9, (2010/02/15)
The invention relates to a method for the production of linear long-chain alcohols with 20 to 40 carbon atoms by means of a growth reaction with ethylene on aluminium compounds.
A facile synthesis of long chain acyclic alkanols via Kolbe coupling: 1-Docosanol and 1-triacontanol
Yadav, Ashok K.,Singh, Arpita
, p. 1724 - 1726 (2007/10/03)
A convenient synthesis of long chain acyclic alkanols viz., 1-docosanol and 1-triacontanol has been devised via Kolbe radical coupling of mono-methyl azelate 2, which has been synthesized from azelaic acid 1. The dimer viz. dimethyl thapsate 3, on Ba(OH)2 hydrolysis affords mono-methyl thapsate 4, which upon mixed Kolbe coupling with appropriate alkanoic acid [CH3(CH)2)nCOOH, n = 6 for 1-docosanol and n = 14 for 1-tri-acontanol] gives the cross coupled products methyl docosanoate 7 and methyl triacontanoate 8 along with the radical dimers dimethyl triacontanedioate 4′ and tetradecane 5′/triacontane 6′ as byproducts. Compounds 7 and 8 on LAH reduction in dry THF yield 1-docosanol 9 and 1- triacontanol 10, respectively in high yields. The mixed anodic coupling has been studied by varying parameters viz. degree of neutralization and molar ratio of compounds 4 and C8/C16 alkanoic acid, current density, anode material etc.
A convenient one step anodic synthesis of 3-alkyl indoles
Yadav, Ashok K.,Singh, Arpita,Prakash, Lalit
, p. 1274 - 1278 (2007/10/03)
3-Alkyl indoles have been synthesized anodically by co-electrolysis of indole-3-propanoic acid 1 and mono carboxylic acids 2a-2f viz. propanoic acid 2a, hexanoic acid 2b, nonanoic acid 2c, decanoic acid 2d, dodecanoic acid 2e and hexadecanoic acid 2f at platinum, titanium and graphite. The dimeric products obtained are viz. 1,4 (3′-diindolyl) butane 1′, alkanes 2′a-2′f and 3-alkyl indoles 3′a-3′f. These products have been separated by column chromatography using different solvents and characterized by IR, 1H NMR and elemental analysis. These studies have suggested that the desired product 3′a-3′f is obtained in 33-60% yield at platinum anode at current density 0.1111 A.cm-2.
LIGHT INDUCED HALOGENATIVE DECARBOXYLATION OF THIOHYDROXAMIC ESTERS
Dauben, William G.,Kowalczyk, Bruce A.,Bridon, Dominique P.
, p. 2461 - 2464 (2007/10/02)
The generality of lidht initiated halogenative decarboxylation of thiohydroxamic esters was studied.This method gave high yields of alkyl chlorides, bromides and iodides derived from primary, secondary and tertiairy substituted carboxylic acids.
THE INVENTION OF RADICAL REACTIONS. PART XV. SOME MECHANISTIC ASPECTS OF THE DECARBOXYLATIVE REARRANGEMENT OF THIOHYDROXAMIC ESTERS
Barton, Derek H. R.,Bridon, Dominique,Fernandez-Picot, Isabel,Zard, Samir Z.
, p. 2733 - 2740 (2007/10/02)
Esters (mixed anhydrides) derived from aliphatic or alicyclic carboxylic acids (RCO2H) and thiohydroxamic acids 2 or 3 undergo a thermally or photochemically induced radical chain reaction to give sulphides 4 with loss of carbon dioxide.On irradiation at low temperature however, the chain reaction is essentially suppressed.Under these conditions moderate to good yields of dimers R-R are obtained from primary acids.The mechanistic and synthetic implications of these observations are discussed.
HYDROZIRKONATION/OXIDATION OF INTERNAL OLEFINS. A SIMPLE SYNTHESIS OF TRIACONTANOL
Gibson, Thomas
, p. 157 - 158 (2007/10/02)
Hydrozirkonation of internal olefins followed by oxidation with anhydrous t-butyl hydroperoxide generates primary alcohols in good yields and high purity.
