摘要:
A method of producing a phenolphthalein comprises reacting a phenolic compound of the formula: wherein R1 is a hydrogen or a C1-C12 hydrocarbyl group, with a phthalic anhydride compound of the formula: wherein R2 is a hydrogen, a C1-C12 hydrocarbyl group, or a halogen, in the presence of a heterogeneous catalyst and a promoter to form a reaction mixture comprising a phenolphthalein compound of the formula: wherein each R1 is independently a hydrogen or a C1-C12 hydrocarbyl group, and R2 is a hydrogen, a C1-C12 hydrocarbyl group, or a halogen; wherein the heterogeneous catalyst comprises a metal oxide composition in combination with a porous support, wherein the metal is molybdenum, tungsten, or a combination comprising at least one of the foregoing metals.
摘要:
Leuco Crystal Violet Lactone is prepared by condensing one molar proportion of each of N,N-dimethylaniline, p-dimethylaminobenzaldehyde, and m-dimethylaminobenzoic acid with 0-1 molar proportion of urea and 1-4 molar proportions of a strong acidic condensing agent.
摘要:
A process for the preparation of phenol-phthalein wherein phenol and phthalic anhydride are reacted in the presence of a crosslinked sulfonic cation exchange resin in the acid form and wherein the water content of the reaction mixture is reduced by the use of aryl phosphites.The sulfonic cation exchange resin can be in the macroporous form or in the gel form. The range of useful crosslinking is 4-40 percent for the macroporous resin and 2-16 percent for the gel resin.
摘要:
Substituted 3,3-diphenylphthalides, useful as color precursors, particularly in the art of pressure-sensitive duplicating systems and heat-sensitive marking systems, are prepared by condensing substituted 2-benzoylbenzoic acids with substituted anilines.
WHEREIN R, R1, R2 AND R3 EACH INDEPENDENTLY REPRRESRESENTS METHYL OR ETHYL, Z REPRESENTS HYDROGEN, DIMETHYLAMINO OR DIETHYLAMINO AND RINGS A AND B MAY OPTIONALLY BE SUBSTITUTED BY HALOGEN OR LOWER ALKYL, SAID PROCESS COMPRISING THE STEP OF OXIDISING A LEUCO COMPOUND HAVING THE FORMULA:
WITH AN INORGANIC PERSULPHATE SELECTED FROM THE GROUP CONSISTING OF AMMONIA PERSULPHATE, SODIUM PERSULPHATE, POTASSIUM PERSULPHATE AND METHYLAMMONIUM PERSULPHATE.
摘要:
A METHOD OF PREPARING RADIOACTIVE MONO AND DI-IODOSULFOBROMOPHTHALEIN FOR CLINICAL PURPOSES AND WHEREIN THE RATIO OF DI TO MONOIOSOSUFOBROMOPHTHALEIN CAN BE CONTROLLED IS DISCLOSED. NO SEPARATION AND PURIFICATION OF THE COMPOUNDS IS REQUIRED FOR THEIR USE IN CLINICAL DIAGNOSTIC PROCEDURES. THE COMPOUNDS, PARTICULARLY THE MONOIODO COMPOUND, OFFER A NUMBER OF ADVANTAGES IN COMPARISON TO SULFOBROMOPHTHALEIN WHEN USED FOR BIOLOGICAL INVESTIGATION.
摘要:
A process for preparing a phthalide compound represented by the formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are individually an alkyl group, and R.sup.1 and R.sup.2, R.sup.3 and R.sup.4, and R.sup.5 and R.sup.6 can respectively bond to each other to form a heterocyclic ring together with a nitrogen atom, comprising oxidizing a triphenylmethane compound represented by the formula (2) ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are the same as above, is oxidized in the presence of activated carbon in an aqueous solvent by an oxidizing agent.The process can provide a fast reaction that produces a high purity product with high yield.