Abstract:
A novel 3-substituted α,β-dibromoethylbenzene of formula (I): wherein X represents a halogen atom or a trihalomethyl group, which is a useful intermediate for pharmaceuticals or agricultural chemicals, is prepared by a simple and high yield process which comprises reacting a 3-substituted α-bromoethylbenzene represented by formula (II): wherein X is as defined above, or a 3-substituted ethylbenzene represented by formula (III): wherein X is as defined above, with bromine in the presence of a quaternary ammonium salt.
Abstract:
The invention concerns vinyl compounds of formula (I), in which R is H, an alkyl or alkenyl group with 1 to 15 C-atoms which may be unsubstituted, substituted singly by CN or CF3 or substituted at least singly by halogen, one or more CH2 units in these groups being replaceable, independently of each other by -O-, -S-, (α), -CO-, -CO-O-, -O-CO- or -O-CO-O- in such a way that O-atoms are not linked directly to each other; A?1 and A2¿, independently of each other, are (a) a trans-1,4-cyclohexylene group in which one or more non-adjacent CH¿2? groups can be replaced by -O- and/or -S-, (b) a 1,4-phenyl group in which one or two CH groups can be replaced by N, (c) a 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, where the groups (a) and (b) may be substituted by CN or fluorine; Z?1 and Z2¿, independently of each other, are -CO-O-, -O-CO-, -CH¿2?O-, -OCH2-, -CH2CH2-, -CH=CH-, -C=C- or a single bond, one of the groups Z?1 and Z2¿ may also be -(CH¿2?)4- or -CH=CH-CH2CH2-; Q is a single bond, -O-, -CH2-CH2-, -C=C-, trans-CH=CH-, -COO- or -CH2O-; X?1¿ is H, F or Cl; X2 is F, Cl, CF¿3? or SF5; Y is H, F or Cl; r is 0 to 4; n is 0 or 1; and m is 0, 1, 2 or 3; with the proviso that, when Y = H and Q = single bond, X?1 and X2¿ are Cl. Such compounds are suitable for use as components of liquid-crystal media.
Abstract:
A method is provided for forming (3-trifluoromethyl-phenyl)acetonitrile through the intermediate α, α, α-trifluoro-α'-chloro-m-xylene. This intermediate is formed by selective chlorination of α, α, α'-trichloro-m-xylene under conditions which maximize yield and minimize the formation of undesired, non-recyclable chlorinated by-products.
Abstract:
New halogenated benzene derivatives of formula (I), where n is 1 to 7, the rings A and B each stand for trans-1,4-cyclohexylene, or one of the rings A and B also stands for 1,4-phenylene or 3-fluor-1,4-phenylene, X F, Cl, -CHF2, -CF3, -CN, -OCF3 or -OCHF2, Y and Z each independently stand for H or F, r = 1 or, if s = 1, B = trans-1,4-cyclohexylene and simultaneously X = -CHF2, -CF3, -OCF3 or -OCHF2 and r = 0, and s = 1 or, if B = 1,4-phenylene or 3-fluor-1,4-phenylene, s = 0.
Abstract:
Described are processes for preparing brominated diphenylalkane products which are far whiter than prior known brominated diphenylalkane products. The resultant white brominated diphenylalkane products also form a part of the present invention, as do formulations incorporating the white brominated diphenylalkane products, and articles prepared therefrom.
Abstract:
Die Erfindungs betrifft neue Verfahren zur Herstellung von zum Teil bekannten Phenylessigsäurederivaten der Formel (I)
in welcher R¹, R² und R³ unabhängig voneinander jeweils für Wasserstoff, Alkyl oder Alkoxy stehen, durch Ozonolyse von Verbindungen der Formel (II)
in welcher R⁴ für Wasserstoff oder Methyl steht und Oxidation der daraus erhaltenen Reaktionsprodukte. Die Erfindung betrifft ferner neue Zwischenprodukte und ein Verfahren zu deren Herstellung.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von 2,2'-Bis(halogenmethyl)-1,1'-binaphthyl, indem man 2,2'-Dimethyl-1,1'-binaphthyl in Anwesenheit eines Lösungsmittels mit einem Halogenierungsmittel unter Einwirkung von Licht einer Wellenlänge von 10⁻⁵ bis 10⁻⁸ m in Anwesenheit oder Abwesenheit eines Radikalbildners bei -10 bis 120 °C umsetzt.
Abstract:
Disclosed are contrast agents of the formula
or pharmaceutically acceptable salts thereof, contained in aqueous compositions and methods for their use in diagnostic radiology of the gastrointestinal tract wherein R = C 1 -C 25 alkyl, cycloalkyl, unsaturated allyl or halo-lower-alkyl, optionally substituted with halo, fluoro-lower-alkyl, aryl, lower-alkoxy, hydroxy, carboxy, lower-alkoxycarbonyl or lower-alkoxycarbonyloxy, (CR i R 2 )p-(CR 3 =CR 4 ) m Q, or (CR 1 R 2 )p-C=C-Q; Ri, R 2 , R 3 and R 4 are independently H, lower-alkyl, optionally substituted with halo; n is 1-5; m is 1-5; p is 1-10; and Q is H, lower-alkyl, lower-alkenyl, lower-alkynyl, lower-alkylene, aryl, or aryl-lower alkyl.
Abstract translation:口服或直肠给药的X线对照组合物。 包括具有式(I)的造影剂或(I)的盐。 药学上可接受的载体 选自两性离子表面活性剂,三甲基溴化铵,月桂基硫酸钠,十七烷基硫酸钠,烷基苯磺酸,丁基萘磺酸钠,琥珀酸丁磺酸盐,羧酸酯,羧酸酰胺,乙氧基化烷基酚和乙氧基化脂族醇的至少一种表面活性剂,脱水山梨醇酯,聚氧乙烯 烷基醚和聚氧乙烯山梨糖醇酐脂肪酸酯。 R = CH 3,C 2 H 5,n-C 3 H 7,4-25 C烷基,环烷基,不饱和的。 烯丙基(sic)或卤代低级烷基,其各自可以选择。 被删除 (CR 1 R 2)p - (CR 3 = CR 4)m Q或(CR 1 R 2)p -C CC-Q; R1,R2,R3和R4各自独立地为H或opt。 晕子 低级烷基,n为2-5,m为2-5,p为1-10,Q为H,低级烷基,烯基,低级炔基,低级亚烷基(sic),芳基或芳基 - 低级烷基。
Abstract:
Disclosed are contrast agents of the formula
or pharmaceuticaoly acceptable salts thereof, contained in aqueous compositions and methods for their use in diagnostic radiology of the gastrointestinal tract wherein Z = H, halo, C₁-C₂₀ alkyl, cycloalkyl, lower alkoxy, cyano, where the alkyl and cycloalkyl groups can be substituted with halogen or halo-lower-alkyl groups; R = C₁-C₂₅ alkyl, cycloalkyl, or halo-lower-alkyl, optionally substituted with halo, fluoro-lower-alkyl, aryl, lower-alkoxy, hydroxy, carboxy, lower-alkoxy carbonyl or lower-alkoxy-carbonyloxy, (CR₁R₂) p - (CR₃ = CR₄) m Q, or (CR₁R₂) p - C ≡ C - Q; R₁, R₂, R₃ and R₄ are independently lower-alkyl, optionally substituted with halo; x is 1-4; n is 1-5; m is 1-15; p is 1-10; and Q is H, lower-alkyl, lower-alkenyl, lower-alkynyl, lower-alkylene, aryl, or aryl-lower alkyl.
Abstract:
A 1-bromoalkylbenzene derivative is prepared by reacting a phenylalkene derivative with hydrogen bromide in the presence of a non-polar solvent. The phenylalkene derivative is prepared by reacting an alkenyl halide with metal magnesium to form a Grignard reagent, and then reacting the Grignard reagent with a benzyl halide derivative. An allyl Grignard reagent is prepared by reacting continuously an allyl halide derivative with metal magnesium in an organic solvent, in which the allyl halide derivative and metal magnesium are continuously added to the reaction system and the allyl Grignard reagent formed is continuously removed from the reaction system. The processes provide the intended compounds in high yields, high selectivities and high purities.