Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7220784 | Substituted stilbenes and their reactions The present invention relates to stilbene and quinone compounds related to combretastatin A-4 and their use as anticancer compounds and prodrugs. The compounds include those with an alkyl group on the double bond of cis or trans-stilbenes, compounds with one or more... | 05/22/2007 |
| 7193019 | Process for the production of vinyl compound A process for the production of a vinyl compound of the formula (1), which process comprises reacting a bifunctional phenylene ether oligomer of the formula (2) with a vinylbenzyl halide ... | 03/20/2007 |
| 7109245 | Vasoconstrictor cannabinoid analogs Methods and compounds for reversing pathological vasodilation of blood vessels, for example vasodilation caused by activation of CB1-like receptors, by administering to a subject a therapeutically effective amount of a compound sufficient to induce vasoconstriction,... | 09/19/2006 |
| 7077960 | Method for obtaining a purified hydrofluoroalkane, purified hydrofluoroalkane, use of same and method for analysing same Process for the production of a hydrofluoroalkane, according to which hydrofluoroalkane comprising organic impurities is subjected to at least two distillations. ... | 07/18/2006 |
| 6958423 | Bromination process This invention relates to a novel process which comprises feeding a mixture formed from diphenylethane and bromine to a stirrable reaction mass comprised of bromine and a bromination catalyst to yield a decabromodiphenylethane wet cake which can be most economically... | 10/25/2005 |
| 6936739 | Fluorine-containing bisphenols, their preparation, their precursors and intermediates, and use of the fluorine-containing bisphenols This invention relates to 1,2-di(4-hydroxyaryl)tetrafluoroethanes of the general formula (I) wherein R are each, independently of one another, hydrogen, F, Cl, Br, I, CN, COOR2, C1-C | 08/30/2005 |
| 6864397 | Difluoromethyl ether derivative and process for producing the same The present invention provides a process for producing a difluoromethyl ether derivative simple and efficient process for producing the difluoromethyl ether derivative represented by Formula (1d′) or a difluoromethyl ether derivative represented by Formula (1c′)... | 03/08/2005 |
| 6844462 | Biphenydiols The invention relates to the biphenyldiols of the formula (V) The corresponding racemic and enantiomerically pure triflate compounds thereof, where R1 and R2 are H, R3 is chlorine, and R | 01/18/2005 |
| 6767923 | Benzhydryl derivatives Benzhydryl derivatives of the formula I, where the index and the variables are as defined below: X is oxygen or sulfur; R1, R3 are halogen, cyano, nitro, hydroxyl, mercapto, amino, alk... | 07/27/2004 |
| 6689922 | Vitamin D analogues The invention concerns novel bi-aromatic compounds having the formula: ##STR1## which are analogs of vitamin D, the process of preparing them, as well as their use in pharmaceutical compositions in human or veterinary medicine, particularly in dermatology... | 02/10/2004 |
| 6635787 | Production method of a 2,6-dichlorophenol compound A 2,6-dichlorophenol compound of formula (1): ##STR1## wherein R represents a 3,3-dihalo-2-propenyl group or a benzyl group optionally substituted by halogen atom(s), can be produced by making a phenol compound of formula (2): ##STR2## wherein R has ... | 10/21/2003 |
| 6342642 | 1,4-diaryl-2-fluoro-1-buten-3-ol compounds and their use in the preparation of 1,4-diaryl-2-fluoro-1,3-butadiene and 1,4-diaryl-2-fluoro-2-butene compounds The present invention provides novel 1,4-diaryl-2-fluoro-1-buten-3-ol compounds of the structural formula I ##STR1## a method for the preparation of those formula I compounds, and the use of those formula I compounds in the preparation of 1,4-diaryl-... | 01/29/2002 |
| 6333437 | Method for purifying a bromine compound A method for purifying a bromine compound by depositing the bromine compound represented by the following general formula (1) as solid particles from a crude solution containing the bromine compound: ##STR1## wherein (i) the crude solution is supplied int... | 12/25/2001 |
| 6278028 | Liquid crystal compounds, mixtures and devices An electroclinic device having two spaced cell walls each bearing electrode structures and treated on at least one facing surface with an alignment layer, a layer of a smectic liquid crystal material enclosed between the cell walls, where the liquid cryst... | 08/21/2001 |
| 6235870 | Dehydrohalogenation of poly (phenylhalo-b-hydroxypropyl ether) to form polyepoxide Process for the preparation of compounds of the formula ##STR1## wherein Hal represents chlorine, bromine or iodine and preferably chlorine, wherein Ra represents hydrogen or a residue comprising one or more additional groups of the formula, ... | 05/22/2001 |
| 6207835 | Process for the preparation of arylmetal compounds and their reaction with electrophilic reagents Arylmetal compounds are prepared by deprotonation of aromatics which have a hydrogen atom in the ortho position relative to a halogen atom or a trifluoromethoxy group, using a suitable base or by halogen-metal exchange of haloaromatics using a suitable me... | 03/27/2001 |
| 6005063 | Epoxy compounds from chlorohydrin ethers of polyphenols Process for the preparation of compound of the formula: ##STR1## wherein Rc represents a residue comprising one or more additional groups of the formula: ##STR2## by heating a compound of the formula (A) ##STR3## at a temper... | 12/21/1999 |
| 6001954 | Process for the manufacture of epoxy compounds Process for the preparation of compounds of the formula ##STR1## wherein Hal represents chlorine, bromine or iodine and preferably chlorine, wherein Ra represents hydrogen or a residue comprising one or more additional groups of the formul... | 12/14/1999 |
| 5868960 | Mesomorphic compound, liquid crystal composition containing the compound, liquid crystal device using the composition, liquid crystal apparatus and display method A mesomorphic compound of the formula (I) according to Claim 1 characterized by having at least two ether groups between alkylene groups in a specific alkoxy perfluoroalkyl terminal group is suitable as a component for a liquid crystal composition providi... | 02/09/1999 |
| 5654331 | Diaromatic compounds derived from a salicylic unit and their use in human and veterinary medicine and in cosmetics Diaromatic compounds, characterised in that they correspond to the following general formula: ##STR1## in which: R1 is --CH3, --CH2 OH, --COR8 or --CH2 OCOR9, R8 is H, OH, -... | 08/05/1997 |
| 5618849 | Orally active antiviral compounds A compound represented by formula I Ar1 --O--M--O--Ar2 I wherein Ar1 and Ar2 are independently substituted phenyl or substituted pyridinyl, the substituents on said phenyl or pyridinyl being ... | 04/08/1997 |
| 5559133 | Orally active antiviral compounds A compound represented by formula I, Ar1 --O--M--O--Ar2, wherein Ar1 and Ar2 are independently substituted phenyl or substituted pyridinyl, the substituents on said phenyl or pyridinyl being independently select... | 09/24/1996 |
| 5457235 | Halogenated diphenyldiacetylene liquid crystals The present invention provides liquid crystals that are diphenyldiacetylenes of the general formulas: ##STR1## where W, X, Y and Z are, independently of one another, a halogen atom, a hydrogen atom or a trihalomethyl group, T1 and T2 | 10/10/1995 |
| 5422035 | Benzene derivatives, and liquid-crystalline medium A liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, comprising one or more compounds of the formula I ##STR1## in which R, A1,. A2, Z1, Z2, m, n, L1... | 06/06/1995 |
| 5366656 | Optically active alcohol and derivatives thereof, liquid crystal composition containing same and liquid crystal device Optically active compounds of general formulae ##STR1## wherein A is O or S, R1 is a hydrogen atom, an alkyl group having 1-22 carbon atoms, a hydroxy containing alkyl group, para-alkyl substituted phenyl, para-alkyl substituted biphenyl, ... | 11/22/1994 |
| 5350772 | Certain substituted phenoxy-methyl phenyl-methoxy benzenes having antiviral activity A compound represented by formula I Ar1 --O--M--O--Ar2 I wherein Ar1 and Ar2 are independently substituted phenyl or substituted pyridinyl, the substituents on said phenyl or pyridinyl being ... | 09/27/1994 |
| 5340498 | Anti-ferroelectric liquid crystal and liquid crystal display device A novel anti-ferroelectric liquid crystal of the formula (I), ##STR1## wherein: is an integer of 3 to 8, each of X and Y is independently a hydrogen atom or a fluorine atom, Z is --CF3, --CH3 or --C2 H5, q is 0 or 5,... | 08/23/1994 |
| 5324449 | Substituted phenyl trifluoromethyl ethers Substituted phenyl trifluoromethyl ethers of the formula I R1 --(A1 --Z1)n --A2 --Z2 --A3 --OCF3 I in which R1, A1 | 06/28/1994 |
| 5302619 | Aromatic compounds, their production processes and their compositions for the control of insect pests Aromatic compounds are disclosed of the formula: ##STR1## wherein R1 is a C3 -C8 alkyl group, a C3 -C8 alkoxy group, an alkoxyalkyl group having 3 to 8 carbon atoms, a C3 -C8 | 04/12/1994 |
| 5279764 | Dihalogenobenzene derivatives The invention relates to dihalogenobenzene derivatives of the formula I R1 --A1 --Z1 --A2 --(Z2 --A3)n --R2 wherein R1, R2, A1, A2, A... | 01/18/1994 |
| 5278215 | Flame-retardant synthetic resin composition and flame retardant A flame-retardant synthetic resin composition containing (A) a synthetic resin and (B) a compound having a 3-halogeno-2-hydroxypropyl group, which shows excellent thermal stability during molding and having good light resistance, is disclosed. A flame ret... | 01/11/1994 |
| 5274002 | Trisubstituted phenyl analogs having activity for congestive heart failure Novel trisubstituted phenyl analogs are now found to have activity as for the treatment of congestive heart failure.... | 12/28/1993 |
| 5248447 | 2,3-difluorohydroquinone derivatives 2,3-difluorohydroquinone compounds of the formula I ##STR1## in which R1 and R2, in each case independently of one another, are alkyl having 1 to 15 C atoms or alkenyl having 3 to 15 C atoms which are unsubstituted, monosubstitu... | 09/28/1993 |
| 5242996 | Modified epoxy resins having acetylenically unsaturated functions A modified epoxy resin or compound of the formula: ##STR1## wherein A is the backbone reside of a glycidyl ether epoxy resin with removal of the glycidyloxy groups; R1 and R2 are independently a hydrogen atom or C1 -C... | 09/07/1993 |
| 5238603 | Optically active liquid crystalline compound and a composition containing same A liquid crystal compound having specific features suitable to use for a display mode utilizing ferroelectric liquid crystals, particularly a large spontaneous polarization value and a liquid crystal composition using the compound are provided, which comp... | 08/24/1993 |
| 5210278 | Process for the preparation of bisarylalkyl ethers A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-me... | 05/11/1993 |
| 5196586 | Polydiphenyldiacetylenes Disclosed herein are polydiphenyldiacetylenes having the following repeating unit (III): ##STR1## (wherein R1 denotes a hydrogen atom or a methoxy group; R2 denotes a hydrogen atom, a methoxy group or a methylamino group; R... | 03/23/1993 |
| 5149858 | Selective ortho-chlorination of phenols Phenolic compounds, notably admixtures of 2,4-dichlorophenol and 2,6-dichlorophenol, are selectively chlorinated at the ortho positions thereof, with gaseous chlorine and in a molten medium, in the presence of a selectivity-enhancing effective amount of a... | 09/22/1992 |
| 5132328 | Alcohol and ether derivatives The invention concerns a compound of the formula I, ##STR1## wherein Ar1 is optionally substituted phenyl or naphthyl; A1 is (1-6C)alkylene, (3-6C)alkenylene, (3-6C)alkynylene or cyclo(3-6C)alkylene; Ar2 is optionally subs... | 07/21/1992 |
| 5130048 | Ferroelectric liquid crystal compositions containing chiral haloalkoxy tails units The subject application discloses a chiral nonracemic composition of the general formula: R1 --Ar--O--CH2 --C*HX--C*HY--CH2 --O--R2 wherein R1 is an achiral tail of two to sixteen carbons; Ar is an achiral... | 07/14/1992 |
