Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8183418 | Process for the synthesis of dihalodinitrotoluene An improved process is provided for the preparation of 2,6-dihalo-3,5-dinitrotoluene by the nitration of 2,6-dihalotoluene. The direct isolation of highly pure 2,6-dihalo-3,5-dinitrotoluene is accomplished without a water or ice quench, by providing at least one equ... | 05/22/2012 |
| 8003831 | Process for the synthesis of dihalodinitrobenzenes A process is provided for the preparation of 1,3-dihalo-4,6-dinitrobenzene by the nitration of 1,3-dihalobenzene. The direct isolation of highly pure 1,3-dihalo-4,6-dinitrobenzene is accomplished without a water or ice quench, and involves the use of at least one eq... | 08/23/2011 |
| 6943257 | Process for preparation of aromatic halides from aromatic amines The present invention provides a process for preparing an aromatic bromide or aromatic iodide from an aromatic amine derivative using nitrite anion and halodimethylsulfonium halide generated in situ from hydrobromic acid/DMSO or hydriodic acid/DMSO. The process for ... | 09/13/2005 |
| 6696613 | Process for preparing diketone compounds and precursors thereto A process for preparing compounds of the formula: ##STR1## wherein R2 is lower alkyl; or phenyl optionally substituted by from one to five groups, the same or different, which are lower alkyl, lower haloalkyl, halogen or --SR4 ; R | 02/24/2004 |
| 6362380 | Preparation of nitrobiphenyls A process for preparing nitrobiphenyls of the formula I ##STR1## where m is 1 or 2, R is halogen R' or OR', where R' is a C-organic radical which may carry groups inert under the reaction conditions, n is 0, 1, 2 or 3, and, in the case of n being 2 or 3, ... | 03/26/2002 |
| 6329529 | Nitrogen-based halogenating agents and process for preparing halogen-containing compounds Disclosed are a fluorinating agent represented by the general formula (1): ##STR1## wherein R1 to R4 are a substituted or unsubstituted, saturated or unsaturated alkyl group or a substituted or unsubstituted aryl group, and can be th... | 12/11/2001 |
| 6284894 | Preparation of allylic aromatic compounds A process for the preparation of an allylic aromatic compound in which an aromatic amine is reacted first with a nitrite and then with an allylic olefin having an eliminatable terminal substituent. Novel allylic derivatives of disubstituted benzene compou... | 09/04/2001 |
| 6087542 | Process for preparing nitrobiphenylene A process for preparing nitrobiphenyls of the formula I ##STR1## where m is 1 or 2, H is halogen R' or OR', where R' is a C-organic radical which may carry groups inert under the reaction conditions, n is 0, 1, 2 or 3, and, in the case of n being 2 or 3, ... | 07/11/2000 |
| 5600035 | Positive photoactive compounds based on 2,6-dinitro benzyl groups and 2,5-dinitro benzyl groups Photoreactive compounds are synthesized from 2,5- or 2,6-dintrobenzyl groups. Also disclosed are methods of synthesizing reactive monomers containing 2,5- or 2,6-dintrobenzyl groups.... | 02/04/1997 |
| 5576455 | Process for the preparation of fluorinated benzoic acids A process for the preparation of 2-chloro-4,5-difluorobenzoic acid and 2,4,5-trifluorobenzoic acid as well as synthetic intermediates useful in and prepared according thereto, comprising reacting a nitrobenzene having the formula ##STR1## wherei... | 11/19/1996 |
| 5574188 | Process for the preparation of 4,6-diaminoresorcinol 4,6-diaminoresorcinol can be prepared in a plurality of steps in such a way that a) 1,3-dichlorobenzene is nitrated with a mixed acid of HNO3, H2 SO4 and SO3 at 0 to 40° C. in anhydrous H2 SO4,... | 11/12/1996 |
| 5451463 | Non-nucleoside 1,3-diol reagents for labeling synthetic oligonucleotides A trifunctional reagent possessing a primary hydroxyl, a secondary hydroxyl, and a primary amino group. This reagent is useful in solid phase oligonucleotide synthesis for the convenient labeling of the 3'-terminus. The secondary hydroxyl may be an phosph... | 09/19/1995 |
| 5367108 | Process for the preparation of dinitro-polyalkylbenzenes Dinitro-polyalkylbenzenes can be prepared by nitration of polyalkylbenzenes using HNO3 in the presence of H2 SO4 in such a manner that at least 50% of the H2 SO4 is present as reaction medium and HNO | 11/22/1994 |
| 5113013 | Process for preparing fluorine-containing organic compounds A method for the preparation of a fluorine-containing organic compound which comprises reacting a sulphonyl halide of the formula: RfSO2 X where Rf represents a fluorinated organic radical and X represents a halogen atom, with a reactive organic hal... | 05/12/1992 |
| 4990699 | Perfluoroalkylation process Despite the instabity of perfluoralkyl anions, it is possible to perfluoroalkylate aromatic compounds if appropriately substituted by suitable electronegative substituents (e.g., nitro, trifluoromethylsulfonyl, etc.). Thus a novel Meisenheimer complex is ... | 02/05/1991 |
| 4978790 | 4,4'-bis[2-(4-hydroxy-amino-phenyl)hexafluoroisopropyl]-diphenylethers and their use Compounds of the formula ##STR1## in which A represents the radicals ##STR2## in which R1 and R2 are different from one another and denote hydrogen, --NO2 or --NH2, R3 is hydrogen or halogen... | 12/18/1990 |
| 4956123 | Method for manufacture of fluorine-containing aromatic derivatives Fluorine-containing aromatic derivatives are produced by the reaction of di(haloacyl)peroxide represented by the general formula: ##STR1## (wherein X stands for a fluorine, chlorine, or hydrogen atom and n for an integer of the value of 1 to 10) with... | 09/11/1990 |
| 4952733 | Preparation of 1,3,5-triamino-2,4,6-trinitrobenzene from 3,5-dichloranisole Preparation of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) from 3,5-dichloroanisole. Nitration of 3,5-dichloroanisole under relatively mild conditions gave 3,5-dichloro-2,4,6-trinitroanisole in high yield and purity. Ammonolysis of this latter compound ga... | 08/28/1990 |
| 4780559 | Process for preparing organic fluorides A method for the preparation of organic fluorides which comprises reacting a quaternary phosphonium fluoride or bifluoride with an organic substrate having at least one atom or group capable of being replaced by a fluorine atom.... | 10/25/1988 |
| 4684734 | Method for manufacture or organic fluorine compounds Organic fluorine compounds such as pentafluorobenzonitrile, tetrafluorophthalonitriles, and pentafluoropyridine are produced by a method which comprises causing a chloro- or bromo-organic compound to react with a fluorinating agent such as an alkali metal... | 08/04/1987 |
| 4621157 | Nitration processes The present invention relates to improvements in processes of preparing dinitrated aromatic compounds, particularly dinitrated aniline and dinitrated substituted aniline compounds, employing relatively dilute and then more concentrated nitric acid as the ... | 11/04/1986 |
| 4600702 | Vapor phase nitration catalysts Catalysts compositions useful to catalyze the nitration of aromatic compounds in the vapor phase to produce nitroaromatic compounds are represented by the empirical formula: wherein M1 is at least one element selected from Group 4b of the Perio... | 07/15/1986 |
| 4568781 | Preparation of fluorine-substituted aromatic compounds Fluorine-substituted aromatic compounds are obtained by reacting the corresponding nitro compound with a salt of hydrofluoric acid in the presence of an acid halide.... | 02/04/1986 |
| 4558166 | Process for the preparation of benzal chlorides Process for the preparation of benzal chlorides from benzotrichlorides, according to which benzotrichlorides are reacted with thiols in the presence of metal salts at elevated temperatures.... | 12/10/1985 |
| 4554103 | Preparation of 4-acyloxyazetidinones from acyl nitrates and penams There is disclosed a high yielding process for cleaving penicillinates with acyl or aroyl nitrates to produce acyloxy or aroyloxy azetidinones which are intermediates in the multistep process for producing penems from penicillinates.... | 11/19/1985 |
| 4440962 | Process for removing nitrosating agents from 1-chloro-2,6-dinitro-4-(trifluoromethyl) benzene To obtain technical TRIFLURALIN with a nitrosoamine content not exceeding 1 ppm, for use as a herbicide, 1-chloro-2,6-dinitro-4-(trifluoromethyl) benzene (DINITRO-PCBT) is freed from nitrosating agents by a process in which DINITRO-PCBT is treated with an... | 04/03/1984 |
| 4391992 | N-Denitration of N,2,6-trinitroanilines with phase transfer catalysts A method for the N-denitration of secondary N,2,6-trinitroanilines with phase transfer catalysts.... | 07/05/1983 |
| 4350824 | Process for the preparation of 1,1-dichloro-alkenes A process for the preparation of a 1,1-dichloroalkene of the formula ##STR1## in which R1 is hydrogen, or an optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aralkyl, aralkenyl or aryl radical, and R2 is an optionally subs... | 09/21/1982 |
| 4338473 | Method for removing nitrosation agent(s) from a nitrated aromatic compound Nitrosation agent(s), contained as by-products in nitrated aromatic compounds after nitration with nitric acid or nitration acid, are removed by a water treatment, wherein the water is distilled off at least partially in vapor form, advantageously under r... | 07/06/1982 |
| 4334111 | Process for preparing substituted benzotrihalides Benzotrihalides are prepared by pyrolyzing a substituted phenyl trihaloacetate of the formula ##STR1## wherein each X is halo, nitro, alkyloxy, aryloxy, aralkyoxy, cyano, lower alkyl, haloalkyl, haloalkyloxy, alkenyl, haloalkenyl, carbamoyl, N,N... | 06/08/1982 |
| 4287374 | Process for the production of fluoronitrobenzenes A fluoronitrobenzene is prepared by heating a mono chloronitrobenzene with an alkali metal fluoride and a phase transfer catalyst at a temperature of no more than 200° C.... | 09/01/1981 |
| 4261908 | Process for isolating aromatic dinitro compounds A process has been developed for isolating aromatic dinitro compounds by using nitric acid in specified concentrations in different portions of a rectifying column and separating off the mixture of aromatic dinitro compounds from the sump of the rectifyin... | 04/14/1981 |
| 4188346 | Dehydrohalogenation of (polyhaloalkyl)benzenes A process for the dehydrohalogenation of a (polyhaloalkyl)benzene containing a benzylic halogen such as 1,3-dichloro-5-(2,4,4,4-tetrachlorobutyl)benzene by contacting the (polyhaloalkyl)benzene with a suitably active Lewis acid catalyst such as SbCl | 02/12/1980 |
| 4185035 | Dinitroaniline purification with inorganic acid halides The present invention is directed to a process for reducing the concentration of nitrosamines in dinitroanilines, which comprises treating a nitrosamine-containing dinitroaniline with PCl3, PCl5, PBr3, POCl3, SC... | 01/22/1980 |
| 4180679 | Novel substituted dinitrotoluenes and methods for preparing the same There are provided substituted dinitrotoluenes and methods of preparation thereof, said dinitrotoluenes being useful as intermediates for the preparation of certain herbicidal 2,6-dinitroanilines.... | 12/25/1979 |
| 4173591 | Process for the preparation of 1,3,5-trifluoro-2,4,6-trinitrobenzene A process for producing 1,3,5-trifluoro-2,4,6-trinitrobenzene by: (1) forming a mixture of fuming sulfuric acid and potassium nitrate wherein the fuming sulfuric acid is composed of at least 25 percent by weight sulfur trioxide, and wherein the molar ratio of ... | 11/06/1979 |
| 4120905 | Removal of nitrosating agents The present invention is directed to a process for removing nitrosating agents from 1-chloro-2,6-dinitro-4-(trifluoromethyl)benzene.... | 10/17/1978 |
| 4110405 | One step process for preparing 2,6-dinitro-4-trifluoromethylchlorobenzene by nitration of 4-trifluoromethylchlorobenzene There is disclosed a one-step process for dinitrating 4-trifluoromethylchlorobenzene to obtain the 2,6-dinitro-derivative.... | 08/29/1978 |
| 4096195 | Cyclic two-stage nitration process for preparing 4-chloro-3,5-dinitrobenzotrifluoride from 4-chlorobenzotrifluoride In accordance with the present invention, there is provided herein a cyclic, two-stage process for dinitrating 4-chlorobenzotrifluoride to form 4-chloro-3,5-dinitrobenzotrifluoride in high yield. The process commences with a mononitration stage wherein 4-... | 06/20/1978 |
| 4051168 | Fluorination process Aromatic compounds containing an -fluoroalkyl or ,-difluoroalkyl side chain are prepared by reacting selected aromatic compounds with a mixture of HF and a metal oxide which is PbO2 or NiO2 at -30° to +80° C. E... | 09/27/1977 |
