Showing papers on "Boron trifluoride published in 1974"
29 citations
Patent•
26 Jun 1974
TL;DR: A battery with a negative lithium electrode and an organic electrolyte comprising boron trifluoride and a mixture of an alkyl carbonate and an ether such as dimethyl carbonate as mentioned in this paper.
Abstract: A battery with a negative lithium electrode and an organic electrolyte comprising boron trifluoride and a mixture of an alkyl carbonate and an ether such as dimethyl carbonate and 1,2dimethoxy ethane.
28 citations
TL;DR: In this article, the phenolic diazoketones (7, n = 3-7) were treated with boron trifluoride etherate in nitromethane.
Abstract: The phenolic diazoketones (7; n = 3-7) were treated with boron trifluoride etherate in nitromethane. For n = 4, 5 and 6 spirodienones (8) were isolated as well as the respective benzocycloalkanones from a concomitant dienone-phenol rearrangement. The formation of (8; n = 4) constitutes the first demonstrated example of Ar1-4 participation.
26 citations
TL;DR: In this paper, the polymerization and crystallization of diazomethane was analyzed starting with various monomer and catalyst concentrations by following the monomer concentration and analysis of the solid polymethylene produced.
Abstract: The polymerization and crystallization of diazomethane was analyzed starting with various monomer and catalyst concentrations by following the monomer concentration and analysis of the solid polymethylene produced. Electron microscopy, thermal analysis, x-ray diffraction, and viscometry and density determinations were used to characterize the crystals as produced and after etching with nitric acid. The crystals have a fibrillar and a lamellar component and show no regular chain folding of the molecules. The overall process follows only very approximately the path expected for an ideal living-polymer system capable of reaction in solution and in the solid state. For more detailed correspondence, it was necessary to assume two reaction paths and two crystallization paths.
23 citations
TL;DR: In this paper, the electronic structures and component energies of the compounds BF3, BF2OH, BF(OH)2, and B(O)3 are reported and the results are discussed in terms of reactions bringing about the slow hydrolysis of BF3 in aqueous solution.
20 citations
TL;DR: In this paper, a study of the method revealed that best recoveries are obtained by using a minimum of 350 mg of lipid extract to prepare the methyl esters of fatty acids.
Abstract: Sample size influences the yields of methyl esters of fatty acids by the boron trifluoride-methanol method. A study of the method revealed that best recoveries are obtained by using a minimum of 350 mg of lipid extract to prepare the methyl esters.
19 citations
TL;DR: In this paper, the preparation of alkyl and arylmagnesium fluorides by the reaction of dialkyl- and diaryl-magnesium compounds with fluorinating agents, such as BF3 etherate, SiF4, Bu3SnF, Ph3SiF and Et2AlF in tetrahydrofuran were studied.
17 citations
TL;DR: In this paper, the double bond region of 5-hydroxy derivatives of flavones and isoflavones in carbon tetrachloride with and without iodine have been used to locate the C�O and CC absorptions in these compounds.
17 citations
TL;DR: Esterification is an important reaction to all chemists and is used more commonly than any other reaction in organic syntheses, biochemical and pharmaceutical research and in medicinal chemistry as discussed by the authors.
15 citations
Patent•
14 Jan 1974TL;DR: In this article, a hydrocarbon-derived resin has been described, having a structure characterized by a softening point in the range of about 10 DEG C. to about 30 DEGC.
Abstract: There is disclosed a hydrocarbon-derived resin having a structure characterized by a softening point in the range of about 10 DEG C. to about 30 DEG C., a viscosity at about 25 DEG C. in the range of about 400 to about 100,000 centipoises and comprising from about 40 to about 80 weight percent units derived from piperylene and correspondingly from about 60 to about 20 weight percent units derived from 2-methyl-2-butene. The invention is typically prepared by polymerizing the monomer mixture in the presence of a catalyst selected from boron trifluoride and boron trifluoride etherate. The resin has particular utility as a modifier, extender and tackifier for natural and synthetic rubber.
15 citations
TL;DR: In this paper, the codimerization of butadiene with ethylene was studied with use of the catalyst system consisting of bis(triphenylphosphine)σ-arylnickel(II) halide and boron trifluoride etherate in methylene dichloride.
Abstract: The codimerization of butadiene with ethylene was studied with use of the catalyst system consisting of bis(triphenylphosphine)σ-arylnickel(II) halide and boron trifluoride etherate in methylene dichloride. The codimerization took place readily at 15 °C under 20 kg/cm2 to give trans- and cis-1,4-hexadiene and 3-methyl-1,4-pentadiene. A catalytic amount of water significantly enhanced the catalytic activity. The reaction path to form the codimers is discussed in terms of the variation in product distribution with time and the reaction kinetics.
TL;DR: In this article, the authors showed that the mixture of epimeric epoxides obtained from (4) was converted into a mixture of (6) and (7) in 25% yield with boron trifluoride in refluxing toluene.
Abstract: 17-Oxo-18-nor-5α,13β-androstan-3β-yl acetate (6) and the 13α-epimer (7) have been synthesized by two routes, both of which involve initially an ?abnormal? Beckmann rearrangement of the oxime of 17-oxo-5α-androstan- 3β-yl acetate to the 13,17-seco nitrile (4). In the shorter but lower- yielding sequence, the mixture of epimeric epoxides obtained from (4) was converted into a mixture of (6) and (7) in 25% yield with boron trifluoride in refluxing toluene. A higher yield was achieved by a Dieckmann condensation of the nitrile esters (9) and (10), readily prepared from the above epoxides via the aldehydes. The latter method was also found to be useful for the synthesis of 1-oxo-19-nor-5α,10β-androstan-17β-yl acetate (22) from 1-oxo-5α- androstan-17β-yl acetate.
TL;DR: Photocyclization of methanolic solution of amide by a 100 W high pressure mercury lamp in the presence of sodium hydroxide afforded a mixture of three phenolic irradiation products, whose structures were proved to be IX, X and XI respectively on the basis of chemical and spectral studies.
Abstract: Irradiation of methanolic solution of amide (VIII) by a 100 W high pressure mercury lamp in the presence of sodium hydroxide afforded a mixture of three phenolic irradiation products, whose structures were proved to be IX, X and XI respectively on the basis of chemical and spectral studies. Among these photocyclization products, X was reducted with sodium borohydride and boron trifluoride to provide the amine (XIII), which was converted with formalin and sodium borohydride to erybidine (I).
Patent•
05 Dec 1974TL;DR: In this article, a two-step process for producing p-tolualdehyde is described, which comprises reacting toluene with carbon monoxide in the presence of hydrogen fluoride and boron trifluoride.
Abstract: This invention relates to a two step process for producing p-tolualdehyde which comprises reacting toluene with carbon monoxide in the presence of hydrogen fluoride and boron trifluoride, characterized by mixing all of the toluene, all of the hydrogen fluoride and only part of the boron trifluoride necessary to convert a substantial amount of toluene to p-tolualdehyde, thereby forming a toluene-hydrogen fluoride-boron trifluoride complex and reacting the toluene in the reaction system with carbon monoxide, thereby converting a portion of the toluene to p-tolualdehyde, and then adding the remainder of the boron trifluoride to the reaction product and reacting the remainder of the toluene with carbon oxide.
TL;DR: Tris(organoamino)boranes may be rapidly and conveniently prepared by the interaction of boron trifluoride diethyl etherate and N-lithiodialkyl-, diaryl-, and alkylarylamides in tetrahydrofuran as mentioned in this paper.
Patent•
12 Jul 1974
TL;DR: The first o-benzyltoluenes were manufactured by reaction of o-xylyl halides with benzenes in the presence of boron trifluoride or its derivatives.
Abstract: The manufacture of o-benzyltoluenes by reaction of o-xylyl halides with benzenes in the presence of boron trifluoride or its derivatives, and new o-benzyltoluenes The new and known o-benzyltoluenes I manufactured by the process of the invention are starting materials for the manufacture of anthracene and anthraquinone and their derivatives
Patent•
05 Apr 1974
TL;DR: In this article, a process for effecting alkylation of an isoparaffin with an olefin in the presence of a catalyst comprising a macroreticular acid cation exchange resin characterized by a surface acid concentration of less than about 05 milliequivalents of hydrogen ion per square meter surface area, boron trifluoride in an amount of at least about 1 equivalent per equivalent of resin acid groups but not in excess of that required to saturate said resin and hydrogen fluoride in the amount between about 01 equivalent and about 10 equivalents per
Abstract: This invention relates to a process for effecting alkylation of an isoparaffin with an olefin in the presence of a catalyst comprising a macroreticular acid cation exchange resin characterized by a surface acid concentration of less than about 05 milliequivalents of hydrogen ion per square meter surface area, boron trifluoride in an amount of at least about 01 equivalent per equivalent of resin acid groups but not in excess of that required to saturate said resin and hydrogen fluoride in an amount between about 01 equivalent and about 10 equivalents per equivalent of resin acid groups
TL;DR: In this paper, the preparation of salts containing the anions [CrO4(BF3)2]2]-2]- [SO3]2- and [CO3]-2- is described.
Abstract: The preparation of salts containing the anions [CrO4(BF3)2]2- [CrO4(BF3)3]2-, [SO4(BF3)2]2- and [SO4(BF3)3]2- is described. Adducts between the oxide ion and BF3 are formed as intermediates in the reaction of BF3 with [NO3]−, [SO3]2- and [CO3]2- and are decomposed to B2O3 and [BF4]−.
Patent•
26 Jul 1974TL;DR: Propylene is oligomerised in the presence of a boron trifluoride catalyst and a small amount of a reagent which reduces the activity of the catalyst, thereby resulting in a reduction of the average molecular weight of the oligomerisation product.
Abstract: Propylene is oligomerised in the presence of a boron trifluoride catalyst and a small amount of a reagent which reduces the activity of the catalyst, thereby resulting in a reduction of the average molecular weight of the oligomerisation product. Butadiene is one said reagent.
TL;DR: The addition of enynic phosphonates to alcohols in the presence of boron trifluoride, leads to γ,δ-ethylenic β-ketophosphonates as discussed by the authors.
Abstract: The addition of enynic phosphonates to alcohols in the presence of boron trifluoride, leads to γ,δ-ethylenic β-ketophosphonates.Yields of 70% have been obtained. Whether Z or E enynic derivates are...
Patent•
23 Dec 1974TL;DR: In this paper, organic amines, amino acids, polyamides and vinyl polymers are fluorinated by the action of fluorine in liquid hydrogen fluoride optionally containing boron trifluoride or antimony pentafluorides at about -80° to 15° C. and optionally under irradiation with light.
Abstract: Organic amines, amino acids, polyamides and vinylpolymers are fluorinated by the action of fluorine in liquid hydrogen fluoride optionally containing boron trifluoride or antimony pentafluoride at about -80° to 15° C. and optionally under irradiation with light.
TL;DR: The boron trifluoride procedure satisfactorily meets the esterification requirements of a greater number of different classes of carboxylic acids than does any other single reagent known.
Patent•
22 May 1974TL;DR: In this paper, a two-step method for decomposing an aromatic aldehyde-hydrogen fluoride-boron trifluoride complex in the presence of benzene as a diluent was proposed.
Abstract: This invention relates to a two-step method for decomposing an aromatic aldehyde-hydrogen fluoride-boron trifluoride complex in the presence of benzene as a diluent to obtain an aromatic aldehyde, hydrogen fluoride and boron trifluoride separately without causing any change in the quality of the aromatic aldehyde or without forming undesirable byproducts.
TL;DR: The title reaction in dichloromethane with a pseudo-first-order rate constant of 1.19 x 10 − 3 sec −, 5000 times faster than the reaction of trityl fluoroborate with tetraethylsilane, yielding as products 4-pentenyldimethylfluorosilane, triphenylmethane, aand boron trifluoride.
TL;DR: Some diamagnetic tris(dithiocarbamato) metal(IV) tetrafluoroborates (M = Co, Rh, Ru) have been synthesised by the oxidation of the corresponding metal(III) compounds with boron trifluoride; the diamagnetism is probably due to the existence of associated species which are detected by osometric weight determinations on chloroform solutions of the complexes as mentioned in this paper.
Abstract: Some diamagnetic tris(dithiocarbamato)metal(IV) tetrafluoroborates (M = Co, Rh, Ru) have been synthesised by the oxidation of the corresponding metal(III) compounds with boron trifluoride; the diamagnetism is probably due to the existence of associated species which are detected by osometric weight determinations on chloroform solutions of the complexes.
TL;DR: The solvent dependence of 1,2-epoxy-1-(p-nitrophenyl)cyclohexane with boron trifluoride-diethyl ether exhibits a pronounced solvent dependence.
Abstract: The reaction of 1,2-epoxy-1-(p-nitrophenyl)cyclohexane with boron trifluoride–diethyl ether exhibits a pronounced solvent dependence: in benzene it gives a 9 : 1 ratio of cis-2-fluoro-2-(p-nitrophenyl)cyclohexanol to 1-(p-nitrophenyl)cyclopentanecarbaldehyde, which does not change with reaction time; in dichloromethane the cis-fluorohydrin is again the main primary product, but is rapidly converted into the aldehyde in the reaction medium; and in ether about equimolar amounts of cis- and trans-2-fluoro-2-(p-nitrophenyl)cyclohexanol are formed. The presence of small amounts of water in the dichloromethane solvent causes the formation of a ca. 6 : 4 mixture of cis-fluorohydrin and aldehyde, the composition of which changes little with reaction time. This solvent dependence of the reaction can be useful for preparative purposes. A reaction mechanism is suggested.
Patent•
01 Mar 1974TL;DR: Boron trifluoride is recovered from a copolymer containing ethylene units and alkyl acrylate units by heating a solution of said copolymers under anhydrous conditions in an inert solvent at a temperature and pressure sufficient to decompose the alkyl acryl-boron trifelectric complex as discussed by the authors.
Abstract: Boron trifluoride is recovered from a copolymer containing ethylene units and alkyl acrylate units, wherein said alkyl acrylate units are complexed with boron trifluoride, by heating a solution of said copolymer under anhydrous conditions in an inert solvent at a temperature and pressure sufficient to decompose the alkyl acrylate-boron trifluoride complex and passing superheated inert solvent for the copolymer into the copolymer solution to remove uncomplexed boron trifluoride from the copolymer and recovering the boron trifluoride for recycle.
Patent•
27 Jun 1974TL;DR: Halogen-containing polymer backbone chains containing grafts of polyethers derived from halogen-substituted oxiranes or oxetanes are described in this article, which are useful as such for films, fibers, coatings, etc.
Abstract: Halogen-containing polymer backbone chains containing grafts of polyethers derived from halogen-substituted oxiranes or oxetanes are described. The graft polymers are produced by contacting polymers containing reactive halogen with halogen-substituted oxiranes or oxetanes in the presence of a catalytic amount of an organoaluminum compound which has been modified with water, boron trifluoride and/or phosphorus pentafluoride. The graft polymers are useful as such for films, fibers, coatings, etc., and are particularly useful for blending with other materials to provide special properties such as flame resistance, impact resistance, etc.
TL;DR: In this paper, the existence of the previously reported (CH3)3P.BF3 and (CH 3PCl2.BCl3 was confirmed also by using tensimetric titrations, direct addition syntheses, 11B NMR and 1H NMR spectra, melting point determinations and vapor pressure data.