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| Number | Title | Issue Date |
| 6872839 | Benzofuran-2-one Benzofuran-2-ones, compositions comprising benzofuranones, processes for preparing them, and their use as colorants for high or low molecular mass organic material. ... | 03/29/2005 |
| 6133184 | Catalyst for catalytic oxidation use A carrier containing silicon carbide, inorganic bonding component, and at least one oxide selected from the group consisting of a niobium oxide, an antimony oxide, and a tungsten oxide carries at least one oxide selected from the group consisting of a van... | 10/17/2000 |
| 5973168 | Preparation process of phthalide compound A process for preparing a phthalide compound represented by the formula (1): ##STR1## wherein R1, R2, R3, R4, R5 and R6 are individually an alkyl group, and R1 and R2 | 10/26/1999 |
| 4732991 | Substituted phthalides Process comprises the combination of the three steps of condensing 3-N(R)2 -4-X-benzoic acid with an aromatic or heterocyclic aldehyde, Y-CHO, under acidic conditions to produce 3-Y-5-X-6-N(R)2 phthalide (II), condensing said phthali... | 03/22/1988 |
| 4533499 | Process for the production of triaryl methane compounds A process for the production of a compound of formula ##STR1## which comprises reacting a compound of formula ##STR2## or a mixture of the compounds (2a) and (2b) with a compound ZH or a compound of formula ##STR3## or a mixture of the... | 08/06/1985 |
| 4455435 | Method for the preparation of Leuco Crystal Violet Lactone 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 condens... | 06/19/1984 |
| 4439610 | Process for preparing triarylmethane derivatives A process is described for preparing triarylmethane derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives and aniline derivatives or indole derivatives with Friedel-Crafts type catalyst or Friedel-Crafts type catalyst ... | 03/27/1984 |
| 4414399 | 5/6 Carboxyphthalides Dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, 2-amino and substituted amino-5'-6'-carboxyfluorans, 1,3-dialkyl-5'/6'-carboxyfluorans, esterified dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, 2-amino and substituted amino-5'/6'... | 11/08/1983 |
| 4399291 | Process for the production of substituted aminophthalides Process comprises the combination of the two steps of condensing Y-benzaldehyde with N--R2 --N--R3 -aniline and 3--N--R--N--R1 -benzoic acid, under acidic conditions to produce 2-[(Y-phenyl) (4--N--R2 --N--R | 08/16/1983 |
| 4271075 | Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide 3,3-Bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide is produced by oxidizing an alkali metal salt of 2-[4,4'-bis-(dimethylamino)-benzhydryl]-5-dimethylaminobenzoic acid in an aqueous solution of pH of 8 to 14 with hydrogen peroxide, oxygen or air in ... | 06/02/1981 |
| 4233223 | Preparation of 3,3-bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide Crystal violet lactone is prepared by oxidizing 2-(4,4'-bis-dimethylaminobenzhydryl)-5-dimethylaminobenzoic acid in aqueous alkaline solution by means of a water-soluble ferricyanide salt or in the presence of a ferricyanide. A very pure crystal violet la... | 11/11/1980 |
| 4094877 | Tri- or tetrasubstituted diphenylphthalides 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.... | 06/13/1978 |
| 4076728 | Process for manufacturing crystal violet lactone Crystal Violet Lactone (CVL) is produced in high yield and highly pure form by a process comprising condensing Michlers hydrol with 3-dimethylaminobenzoic acid to form leuco CVL, extracting the reaction mixture containing the leuco CVL with an aromatic hy... | 02/28/1978 |
| 4055358 | Nitro-phthalides, their manufacture and their use in recording systems Nitro-phthalides of the formula ##STR1## in which E is a radical of the formula ##STR2## X and X' each represents alkyl with 1 to 12 carbon atoms, alkoxy with 1 to 12 carbon atoms or acyloxy with 2 to 12 carbon atoms, and X may also be hydr... | 10/25/1977 |
| 4052415 | Manufacture of lactones of the triphenylmethane series A process for the manufacture of ##STR1## where R and A are identical or different and each is alky of 1 to 4 carbon atoms, by oxidation of ##STR2## with air, oxygen or mixtures thereof, in an acid medium at a pH of from 1.5 to 5.5, at from... | 10/04/1977 |
| 4045458 | Process for preparing triarylmethane derivatives A process is described for preparing triarylmethane derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives and aniline derivatives or indole derivatives with Friedel-Crafts type catalyst or Friedel-Crafts type catalyst ... | 08/30/1977 |
| 4035391 | Phthalide and naphthalide derivatives This invention relates to a process of preparing phthalein indicator dyes including phthalides and naphthalides derived from certain hydroxy-substituted carbocyclic aryl compounds, such as phenols, and from certain N-heterocyclic aryl compounds, such as i... | 07/12/1977 |
| 4032545 | Phthalides and naphthalides This invention relates to a process of preparing phthalein indicator dyes including phthalides and naphthalides derived from certain hydroxy-substituted carbocyclic aryl compounds, such as phenols, and from certain N-heterocyclic aryl compounds, such as i... | 06/28/1977 |
| 3987062 | Process of preparing 3,3-bis[4-dimethylaminophenyl]6-dimethylaminophthalide 3,3-BIS[4-DIMETHYLAMINO-PHENYL]-6-DIMETHYLAMINOPHTHALIDE (CVL) is prepared by oxidizing 2-[4,4-bis(dimethylamino)-benzohydryl]-5-dimethylamino benzoic acid by the use of hydrogen peroxide in an aqueous alkaline solution, inert water soluble organic solven... | 10/19/1976 |
| 3976662 | 1:1 Adducts of 1-naphthol and (Na)phthalaldehydic acid This invention relates to derivatives of phthalaldehydic and naphthalaldehydic acid useful as intermediates in the preparation of pH-sensitive phthalide and naphthalide indicator dyes. One class of intermediates provided by the present invention comprises... | 08/24/1976 |
| 3954799 | Protonated indole phthalides and naphthalides This invention relates to protonated compounds of the formula: ##SPC1## Wherein A is a radical selected from ##SPC2## X represents the atoms necessary to complete a ring-closing moiety selected from phthalide and naphthalide; and Z is an anion derived fro... | 05/04/1976 |
| 3931228 | Process for preparing phthalide and naphthalide indicator dyes This invention relates to a process of preparing phthalein indicator dyes including phthalides and naphthalides derived from certain hydroxy-substituted carbocyclic aryl compounds, such as phenols, and from certain N-heterocyclic aryl compounds, such as i... | 01/06/1976 |
