Abstract: A solution comprising a halomagnesium tetrakis(Faryl)borate in a liquid organic medium, wherein the liquid organic medium is comprised of one or more liquid dihydrocarbyl ethers, one or more liquid hydrocarbons, one or more liquid halogenated hydrocarbons, or mixtures thereof, is contacted with water. This produces magnesium di[tetrakis(Faryl)borate] in the organic phase of a two-phase water/liquid organic medium. The magnesium di[tetrakis(Faryl)borate] can be, but need not be, isolated. A protic ammonium salt, an onium salt, or a triarylmethyl salt can be reacted with the magnesium di[tetrakis(Faryl)borate] to produce the corresponding protic ammonium, onium, or triarylmethyl tetrakis(Faryl)borate. The magnesium di[tetrakis(Faryl)borate] can instead be reacted with a metal salt to form a metal tetrakis(Faryl)borate.

Abstract: Fluoroaryl Grignard reagents are produced from a hydrocarbyl Grignard reagent and fluoroaromatic compounds via separate additions of different fluoroaromatic compounds, such that the conversion of hydrocarbyl Grignard reagent to the desired fluoroaryl Grignard reagent is essentially complete, and thus the reaction product is free or essentially free of agents that may negatively affect subsequent reactions. The fluoroaryl Grignard reagents may be further reacted with boron trihalides in order to obtain tris(fluoroaryl)boranes or tetrakis(fluoroaryl)borates.

Abstract: An air assisted hem former for folding a margin of a foldable material which uses at least one stream of air to urge margin material through a folded cavity. The folded cavity and airflow moves the margin toward a sewing needle, directs the margin material to a proper stitching position and maintain the stitching position until the needle has stitched the hem. Two similarly formed hem formers can be mounted on opposing sides of a sewing needle to urge, direct and maintain the margin material prior to stitching of a hem.

Abstract: A solution comprising a halomagnesium tetrakis(Faryl)borate in a liquid organic medium, wherein the liquid organic medium is comprised of one or more liquid dihydrocarbyl ethers, one or more liquid hydrocarbons, one or more liquid halogenated hydrocarbons, or mixtures thereof, is contacted with water. This produces magnesium di[tetrakis(Faryl)borate] in the organic phase of a two-phase water/liquid organic medium. The magnesium di[tetrakis(Faryl)borate] can be, but need not be, isolated. A protic ammonium salt, an onium salt, or a triarylmethyl salt can be reacted with the magnesium di[tetrakis(Faryl)borate] to produce the corresponding protic ammonium, onium, or triarylmethyl tetrakis(Faryl)borate. The magnesium di[tetrakis(Faryl)borate] can instead be reacted with a metal salt to form a metal tetrakis(Faryl)borate.

Abstract: An alkali metal fluoride is reacted with a halomagnesium tetrakis(.sup.F aryl)borate to form an alkali metal tetrakis(.sup.F aryl)borate. The alkali metal tetrakis(.sup.F aryl)borate can be isolated, or the alkali metal cation can be replaced by an organic cation.

Abstract: This invention relates to methods for separating tris(aryl)boranes from tris(aryl)boranetetrahydrofuran complexes in hydrocarbon solvents via distillation.

Abstract: Perfluoroaryl Grignard reagents are produced from a hydrocarbyl Grignard reagent and polyhaloaromatic compounds via separate additions of different polyhaloaromatic compounds, such that the conversion of hydrocarbyl Grignard reagent to the desired perfluoroaryl Grignard reagent is essentially complete, and thus the reaction product is free or essentially free of agents that may negatively affect subsequent reactions. The perfluoroaryl Grignard reagents may be further reacted with boron trihalides in order to obtain tris(perfluoroaryl)boranes or tetrakis(perfluoroaryl)borates.

Abstract: An air assisted hem former for folding a margin of a foldable material which uses at least one stream of air to urge margin material through a folded cavity. The folded cavity and airflow moves the margin toward a sewing needle, directs the margin material to a proper stitching position and maintain the stitching position until the needle has stitched the hem. Two similarly formed hem formers can be mounted on opposing sides of a sewing needle to urge, direct and maintain the margin material prior to stitching of a hem.

Abstract: One aspect of the invention is a process for purifying a pentafluorophenyl boron compound from a crude mixture comprised of the pentafluorophenyl boron compound and impurities, the impurities at least comprised of an ether and water, the process comprising: (a) mixing the crude mixture with an azeotropic organic solvent which (i) is capable of azeotrope formation with the water and (ii) has a boiling point above the boiling point of the ether; (b) distilling the resulting solution to remove at least a portion of the impurities; and (c) cooling the distilled solution so that a precipitate comprised of the pentafluorophenyl boron compound is formed. Processes are also described for producing pentafluorophenyl boron compounds which are particularly pure, dry and fine.

Abstract: A slurry is formed from an auxiliary catalyst (e.g., an aluminoxane or organoboron compound), a porous inorganic oxide carrier, and an inert organic solvent. The slurry is enclosed in a closed vessel and the temperature and pressure of the enclosed slurry are increased to a temperature of from about 80.degree. C. to 250.degree. C. and a pressure of from about 5 to 500 psig such that a supported composition is produced in the vessel. After opening the closed vessel, the supported composition and the solvent are separated from each other.

Abstract: Exo-isomers of polyalkylcyclopentadienes are converted to endo-isomers by contacting the exo-isomers with an acid such as aqueous HCl.

Abstract: Inorganic and organic impurities are removed from a metallocene catalyst compound comprising the steps of (a) separating inorganic impurities from said compound by forming a solution of said compound in an organic solvent medium which is substantially a non-solvent for said inorganic impurities, (b) treating the solution of said compound with a particulate absorbing material so as to absorb and remove organic impurities from said solution, and (c) separating the solid material, including said particulate absorbing material, from said solution. Optionally, water can be removed by adding a drying agent.

Abstract: A process for making a metallocene, said process comprising the steps of (a) reacting an alkylsubstituted cyclopentadiene ligand, which contains a mixture of endo- and exo-isomers, with up to about a 10% excess over a stoichiometric amount of a deprotonation agent based on the amount of endo-isomers, so as to form a salt of said endo-isomers, (b) reacting the endo-isomer salt with a transition or actinide metal compound so as to form said metallocene and (c) optionally separating said exo-isomers and trace amounts of unreacted endo-isomers from said metallocene by distillation.

Abstract: Alkyl substituted cyclopentadienes are prepared by reacting cyclopentenones with a Grignard reagent followed by the acidification and dehydration of the resulting tertiary alcohol with an organic carboxylic acid.

Abstract: A process for preparing a cyclopentenone by forming a two-phase mixture of a 1,4-diketone, a water immiscible organic solvent, and an aqueous base solution, and heating the mixture so as to convert the 1,4-diketone to a cyclopentenone which collects in the organic solvent phase.

Abstract: A process is provided for preparing a transition metal compound of the formula: (RC.sub.5 H.sub.4).sub.2 MX.sub.2, where R is hydrocarbyl or silahydrocarbyl of 1 to 10 carbon atoms, M is titanium or zirconium and X is halogen. The process comprises the steps of:(a) reacting Na(C.sub.5 H.sub.5) with RX, where R and X are as defined above, in an organic solvent so as to form a reaction product mixture which includes RC.sub.5 H.sub.4 and C.sub.5 H.sub.5 ;(b) vacuum stripping the product mixture at ambient temperatures so as to remove substantially all of said C.sub.5 H.sub.5 from said product mixture;(c) deprotonating the RC.sub.5 H.sub.4 ; and(d) adding MX.sub.4, where M and X are as defined above, to the product mixture so as to react the RC.sub.5 H.sub.4 and the MX.sub.4 and form said transition metal compound, the transition metal compound being substantially free of C.sub.5 H.sub.5 containing impurities.

Abstract: Fusible polyimide powders are prepared by the process of this invention. An amic acid amine is first prepared by treating (n+1) moles of a bis(aminophenyl)methane with n mole of aromatic tetracarboxylic anhdride to produce an aromatic amic acid prepolymer. This prepolymer is then mixed with an unsaturated carbocyclic monoanhydride and the mixture heated to form a reactive end-capped polyamic acid precursor. The resulting composition is thermally treated in order to partially imidize the precursor. The resulting fusible polyimide powder is finally separated.

Abstract: A process of selectively preparing p-bromo-o-alkylanilines (e.g. 4-bromo-2-methylaniline) by reacting o-alkylanilines (e.g., 2-methylaniline) with unadsorbed bromine in a solvent selected from the group consisting of an inert di- tri- or tetrahaloaliphatic hydrocarbon (e.g., dichloromethane and dibromomethane), an alkyl nitrile (e.g., acetonitrile) and mixtures thereof.

Abstract: This invention relates to a process for treating a first product which contains monobromopentaerythritol, dibromoneopentyl glycol and tribromoneopentyl alcohol to yield a second product having a dibromoneopentyl glycol content, on a weight percent basis, greater than that of the first product. The process features forming a stirrable mass from the first product and a solvent system in which, at a temperature within the range of from about 0.degree. C. to about 40.degree. C., the monobromopentaerythritol and the tribromoneopentyl alcohol are more soluble than the dibromoneopentyl glycol and in which at least 85% of the dibromoneopentyl glycol in the mass is insoluble; maintaining the reaction mass within the aforementioned temperature range to realize an insoluble portion and a solvent and solute portion; and separating the insoluble portion and the solvent and solute portion without substantial precipitation of the solute from the solvent and solute portion.

Abstract: This invention relates to a process for preparing DBNPG by brominating pentaerythritol with HBr in the presence of a catalyst and solvent wherein water is present during the process. The reaction mass is neutralized prior to recovery of the DBNPG from the reaction mass.