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Showing 1 to 20 of 38 for “"Acetates."”.
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Effect of degree of acetylation on mechanical properties of cellulose acetate films
Four samples of cellulose acetates having degrees of combined acetic acid between 50.8 - 55.8% were fractionated to obtain sharp fractions or approximately the same degree of polymerization. About 2000 grams starting material of each sample of cellulose acetate were needed to obtain approximately …
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Metal complexes of 1,2-quinone monooximes and their applications in organic synthesis
… metal (magnesium and barium) hydroxides and acetates [M(OH)n or M(OAc)r] have been carried out.
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Studies on photochromic and potentially mesogenic mercury(II) dithizonates
… 4-(4'-n-alkoxybenzylideneanilino)mercury(II) acetates. The 4-( 4 '-n-alkoxybiphenyl)mercury(II) dithizonates, CₙH₂ₙ₊₁ OC6H4 C6H4- Hg(HDz) (n = 4, 5, 10, 14 or 18), were similarly prepared by reaction of dithizone with the appropriate 4-(4'-n-alkoxybiphenyl)mercury(II) bromides, although the …
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Synthesis of delta-1(9)-octalinols and their analogues
… These octalinols were characterised as their acetates (1, R=Ac). The attempts to convert these to the desired ketone dienes 2 by reaction with mixtures of acetic anhydride-acetic acid-boron trifluoride proved unsuccessful. Two model compounds derived from hecogenin and incorporating the …
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Effects of Capture and Return on Chardonnay (Vitis vinifera L.) Fermentation Volatiles
… and decreased concentrations of fusel alcohol acetates, fatty acids and higher alcohols in treatment wines. When fermentation temperature was maintained at 15ºC there was increased concentration and retention of fusel alcohols, fatty acids and higher alcohols compared to 15ºC. Sensory analysis …
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The chemical diversity of midge pheromones
… males. These were shown to be 15-carbon acetates with the acetate function at C-2, probably with two and one double bonds respectively. New or improved methods for rearing midges, collecting midge pheromones, setting up EAG preparation and separating stereoisomers by HPLC are reported. …
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From conventional to microphotochemistry: A study of phthalimide and phthalonitrile derivatives
… work included addition reactions using phenyl acetates, α-keto carboxylates and protected amino acids. Once these photo-additions were optimised using a Rayonet reactor, interest was turned to the conversion of this chemistry to a micro-flow platform with a view to improving the results …
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Synthesis of Glitazone Analogues as Anti-Diabetic Drugs
In this study, three series of novel glitazones (acetates, glycinates and alaninates) were designed and prepared by using appropriate synthetic methods to incorporate aromatic ring, alicyclic amines and alanine moiety instead of glycine moiety as a linker via two carbons. This was done over five …
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Coinage Metal Chalcogenide Clusters with N-Heterocyclic Carbene Ancillary Ligands
… phosphine- or phosphite-solubilized group 11 acetates (R3P-M-OAc; M = Cu, Ag, Au). Clusters were characterized by combustion analysis and spectroscopic methods in solution and the solid state. The clusters were phosphorescent at low temperatures with emission energies that depend on the …
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ΜΕΛΕΤΗ ΟΞΕΙΔΩΣΗΣ ΟΞΙΜΙΝΙΚΩΝ ΚΑΙ ΙΜΙΝΙΚΩΝ ΠΑΡΑΓΩΓΩΝ ΚΑΡΒΟΝΥΛΙΚΩΝ ΕΝΩΣΕΩΝ
… AND PYRAZOLINE- 1,2 - DIOXIDES OR TO GEM-NITROSO-ACETATES RATHER THAN THEIR ISOMERIC PYRAZOLE- 1,2 - DIOXIDES IS PERSSUMABLY INFLUENCED BY THE CONFORMATIONAL EFFECTS OF THE CYCLOHEXANE RING. TREATMENT OF THE GEM-NITROSOACETATES WITH HYDROGEN PEROXIDE YIELDED THE CORRESPONDING NITRO COMPOUNDS, …
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Chemical Modification of Alginates in Organic Media
… random or M-selective substitution. Alginate acetates synthesized in an M-selective fashion were used to study the ability of these derivatives to form Ca-crosslinked hydrogels. Detailed structure-property analyses were performed to identify acetylation reaction conditions and product …
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Isolation, Characterization, and Synthesis of Bioactive Natural Products from Rainforest Flora
… were determined by conversion into thiazolidine acetates of known stereochemistries and analysis with standards by GCMS. Two new diterpenes were isolated from Hymenaea courbaril, which in an earlier investigation provided a new diterpene. The absolute configurations of these diterpenes were …
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EXPLORING CO2 FUCTIONALIZATION WITH D6 COMPLEXES AND MATERIALS
… of CO2 into the Ir–CH3 complex for formation of acetates. With the aid of a Lewis acid, our (CCC)Ir–CH3 compound can perform CO2 insertion to yield (CCC)Ir–OAc.Ethanol is commonly used as a fuel additive, but there are advantages to utilizing butanol as a drop-in substitution for ethanol. We …
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Catalytic allylation of aldehydes mediated via the water-gas shift reaction
… application of five different 2-subtituted allyl acetates and an additional two non-symmetrical allyl pro-nucleophiles across a range of aldehydes in good to excellent yield with high regioselectivity in the case of the non-symmetrical allyl sources. Furthermore, the highly chemoselective nature …
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Fluorinated amino acid derivatives
… with 2-bromo-3-fluorobutane failed. New phosphonoacetates, tert-butyl and benzyl diethylphosphono-acetates were prepared as very versatile intermediates in the syntheses of carboxylic acids. Methyl-, ethyl-, tert-butyl-, and benzyl 4-fluoro-3-methyl-2-pentenoates were synthesized in high yields by …
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2-substituted-1, 3-dioxan-5-ones : synthesis, reactions and synthetic applications
… trapped as trimethylsilyl enol ethers or as enol acetates, however they failed to react with alkylating agents. The problem was solved using Enders' chiral hydrazone method. The synthetic utility of 2-substituted-1,3-dioxan-5-ones was illustrated in syntheses of (+)-frontalin and several protected …
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Method Development Towards Catalytic Transformations of Reactive Intermediates
… aza-Piancatelli rearrangement of furcarbinol acetates was explored in chapter four. An in situ IR monitoring technique was used to extrapolate mechanistic insight from preliminary kinetic data. A cationic palladium species was proposed to act as the active catalyst, while the silver salt had …
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Linear allylic C-H oxidation: methods and utility
… allows for the direct installation of allylic acetates via a Pd(II) catalysis. A clever implementation of this strategy shows its utility and ability to streamline the synthesis of known molecules (e.g. L-galatose). Further exploration of this reaction manifold gives rise to a linear allylic …
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