摘要:
The invention relates to a method for producing metal complexes of formula (2) [MaLxXn]Ym (2), where M is a metal from the group consisting of Mn(II), Mn(III), Mn(IV), Fe(II), Fe(III) or Fe(IV), X is a coordinating compound selected from mono-, bi- or tri-charged anions or neutral molecules which can coordinate to a metal in mono-, bi- or tri-dentate form, Y represents a non-coordinating counter-ion which ensures charge equalization of the complex, L represents a ligand of formula (1) or the protonized or de-protonized form thereof, and a, x, n, m, R, R1, R2, R3 and z have the meanings described in claim 1. Said method is characterized in that the reaction of one or more ligands of formula (1) with an iron salt or manganese salt is carried out in an acetone/water mixture in a temperature range from 0 to 50° C. and for this purpose a solution or a suspension of the one or more ligands of formula (1) in acetone is brought in contact with an aqueous metal salt solution of the iron salt or manganese salt in the temperature range in which the reaction takes place.
摘要:
Diallyloxyacetic acid and its basic addition salts, their preparation process and their application as cross-linking agents.Diallyloxyacetic acid and its basic addition salts, preparation process and application as cross-linking agents.
摘要:
Preparation process for 5-(2-thenyl) hydantoin in which 5-(2-thenylidene) hydantoin is reacted in acetic acid with a phosphorous compound selected from the group consisting of red phosphorus and phosphonic acid, in the presence of a catalytic amount of an iodine compound selected from the group consisting of iodine and hydroiodic acid.
摘要:
Preparation process for piperonal by decarboxylating oxidation of 3,4-methylenedioxy mandelic acid by nitric acid in aqueous medium in the presence of hydrochloric acid.
摘要:
A crystallized sodium orthohydroxymandelate-phenol-water complex, its preparation process in which phenol (P.sub.2) is introduced into an aqueous solution S at a pH comprised between 7 and 9.5 in order to obtain the expected product which is crystallized, the aqueous solution S being such as that resulting from the reaction of phenol (P.sub.1) with glyoxylic acid in the presence of a tertiary amine and of a trivalent cation, then treatment using a solution of an alkaline hydroxide, use of this complex for the preparation of sodium orthohydroxymandelate (NaOHM), preparation process for the latter from the starting complex.
摘要:
An aqueous styrene-acrylic type polymer dispersion useful as a wet strength adhesive contains at least one copolymer consisting of 0.5 to 5% by weight of N-allylacetoacetamide monomer (A) and 99.5 to 95% by weight of a mixture of monomers (B) consisting of 90 to 99.9% by weight of styrene and of at least one monomer selected from C.sub.1 to C.sub.8 alkyl (meth)acrylates and 10 to 0.1% by weight of at least one monomer selected from acrylic acid, methacrylic acid, acrylamide and methacrylamide.
摘要:
The process for preparing a novel product, pure crystalline methyl 2-acryloylamino-2-methoxyacetate, involves reacting pure crystalline, anhydrous acrylamido-glycolic acid in an anhydrous medium with methanol in the presence of hydrogen chloride. This is subsequently neutralized with an alkali metal bicarbonate, and then the mineral salts are filtered off. Finally, pure crystalline methyl 2-acryloylamino-2-methoxyacetate is obtained by taking up the concentrated reaction medium in 1,1,1-trichloroethane under vacuum.