Abstract:
An acylated diketonic compound is produced by rearrangement of the corresponding enol ester in the presence of a cyanide source. In one embodiment the cyanide source is employed with a molar excess of a moderate base, with respect to the enol ester. In another embodiment, the cyanide source is a stoichiometric amount, with respect to the enol ester, of potassium or lithium cyanide and a catalytic amount of a Crown ether is used.
Abstract:
Polyurethane foams prepared with halogenated phosphoric acid flame retardant have low scorch and surface discoloration when prepared in the presence of a composition containing phenothiazine, 4,4'-thio-bis-(6-tertiary butyl meta cresol), and organophosphite.
Abstract:
Decombinant plasmids adopted for transformation of prokaryotic and eukaryotic hosts having an insertion site for at least one DNA fragment are provided. In a preferred embodiment, nucleotide sequences coding for methotrexate-resistant dehydrofolate reductase and a nucleotide sequence, a portion thereof coding for a promotor, are ligated into the insertion site.
Abstract:
A 10W transmission lubricant composition comprises a mixture of ingredients (A), (B) and (C) wherein; Ingredient (A) is a polyol ester represented by the formula; wherein R,, R 2 and R 3 are the same or different and are -OCH 2 (CH 2 ) x CH 3 radicals where x is an integer from 6 to 10; Ingredient (B) is a polyol ester represented by the formula; wherein R 4 , R 5 and R 6 are the same or different and are iso-C n hydrocarbon radicals, where n is an integer from 18 to 24; and Ingredient (C) is a polyalphaolefin of from about 3 to about 6 centistoke viscosity; wherein the weight ratio of ingredient (A) to ingredient (B) is from about 2:1 to about 1:2, the weight ratio of the sum of ingredients (A) plus (B) to ingredient (C) is from about 2.4:1 to about 1.5:1, and the sum of ingredient (A) plus ingredient (B) plus ingredient (C) comprises at least about 90 weight percent of said composition.
Abstract:
A process for preparing substituted phthalic anhydrides, e.g. 4-methylphthalic anhydride, in which the Diels-Alder addition product of a conjugated diene, e.g. isoprene, and maleic anhydride is reacted with bromine in the presence of an acid acceptor. The acid acceptor can be present in catalytic amounts. Typical acid acceptors include dimethylformamide and pyridine.
Abstract:
Novel microcapsules are disclosed in which a liquid material which is substantially insoluble in water is enclosed within a solid permeable shell of etherified urea-formaldehyde polymer, prepared by a process which comprises: (a) providing an organic solution comprising said material and a urea-formaldehyde prepolymer in which from about 50% to about 98% of the methylol groups of said prepolymer have been etherified with a C 4 -C 10 alcohol; (b) creating an emulsion of said organic solution in an aqueous solution comprising water and a surface-active agent, wherein said emulsion comprises discrete droplets of said organic solution dispersed in said aqueous solution; (c) causing in situ self-condensation of said urea-formaldehyde prepolymers by adding to said emulsion an acidifying agent and maintaining said emulsion at a pH of between about 0 and about 4 for a sufficient period of time to allow substantial completion of in situ condensation of said resin prepolymers to convert the liquid droplets of said organic solution to capsules consisting of solid permeable polymer shells enclosing said liquid material; and (d) heating said emulsion to a temperature between about 20°C and about 100°C to cause curing of said in situ formed polymers.
Abstract:
Disclosed is a process for preparing organosulfonium halide of the formula wherein X is an halide, R,, R 2 and R 3 are the same or different and are selected from the group consisting of: alkyl having 1 to 24 carbon atoms, inclusive; allyl having 2 to 24 carbon atoms, inclusive; alkenyl having 2 to 24 carbon atoms, inclusive; alkynyl having 2 to 24 carbon atoms, inclusive; aryl having 6 to 24 carbon atoms, inclusive; and wherein said alkyl, allyl, alkenyl, alkynyl and aryl are optionally substituted with a group that is inert to organo-sulfides comprising: reacting an alcohol, e.g. methanol, with an halide derivative which when reacted with an organo-sulfide forms an organo- sulfonium halide, e.g., thionyl halide, sulfuryl halide and carbonyl halide; and then adding an organo-sulfide, e.g., dimethyl sulfide, to the above reaction mixture with agitation while allowing the gas formed to be eliminated so that the organosulfonium halide, e.g., trimethyl sulfonium halide, is formed. This process can take place in the presence of an inert solvent, e.g., methylene chloride.
Abstract:
A solid phosphorus pentoxide containing material suitable for use in fast-setting cements can be produced by a process which comprises mixing a porous material with a liquid, phosphorus pentoxide containing material and heating the mixture until a dry solid is produced. The solid phosphorus pentoxide containing material thus formed can then be dry blended with a solid component comprising magnesium oxide, magnesium hydroxide, magnesium carbonate or mixtures thereof. An aggregate can optionally be added into this dry blend. The components of the resulting dry blend react in the presence of an aqueous component to form a monolithic solid.