摘要:
Geradkettige oder verzweigte, offenkettige oder cyclische Alkane oder Alkene, aromatische oder araliphatische Kohlenwasserstoffe oder aliphatische, aromatische oder aliphatisch-aromatische Ether, die ein oder mehrere Halogenatome tragen, oder deren Gemische können dadurch reduktiv dehydrohalogeniert werden, daß man solche Halogenverbindungen in der Gasphase mit Wasserstoff in Gegenwart von Aktivkohle bei Temperaturen von 200-700°C unter Bildung von Halogenwasserstoff umsetzt.
摘要:
Disclosed is a process for dehydrohalogenating an aromatic bromide or iodide by contacting the aromatic halide with hydrogen at elevated pressure in the presence of an alkyl halide-forming compound and a Group VIII metal catalyst. The presence of the alkyl halide-forming compound, such as an alkanol, diol, trial or derivative thereof, facilitates the dehydrohalogenation reaction and permits the recovery of the halogen as alkyl halides from which the bromide and iodide values can be economically recovered.
摘要:
1. A process for the reductive dehalogenation of an organic halogen compound in which one or more halogen atoms are covalently bonded to the carbon, by reaction with a hydrocarbon in the presence of carbon at elevated temperatures with formation of a hydrogen halide, wherein the dehalogenation is carried out in the presence of iron powder or an iron compound as a cocatalyst, at from 100 to 450 degrees C.
摘要:
La présente invention concerne un procédé d'hydrogénolyse mettant en oeuvre un nouveau catalyseur constitue d'un complexe palladium-phosphine, celle-ci présentant un pKa supérieur ou égal à 6, un dérivé aromatique chloré et de l'hydrogène.
摘要:
A process is disclosed for preparing bidentate ligands of the formula: wherein: each Ar is independently selected from aromatic ring compounds having 6 up to 14 carbon atoms, e.g., phenyl, naphthyl, phenanthryl and anthracenyl; the x bonds and the y bonds are attached to adjacent carbon atoms on the ring structures; each R, when present as a substituent, is independently selected from alkyl, alkoxy, aryloxy, aryl, aralkyl, alkaryl, alkoxyalkyl, aryloxyalkyl, cycloaliphatic, halogen, alkanoyl, aroyl, alkanoyloxy, aroyloxy, alkoxycarbonyl, aryloxy carbonyl, carboxyl, cyano, sulfonic acid or formyl radicals; n is a whole number in the range of 0-4 were Ar is phenyl; 0-6 where Ar is naphthyl; and 0-8 where Ar is phenanthryl or anthracenyl; each R₁ and R₂ is independently selected from alkyl, aryl, aralkyl, alkaryl or cycloaliphatic radicals, or substituted derivatives thereof, wherein; substituted derivatives include ethers, amines, amides, sulfonic acids, esters, hydroxyl groups and alkoxy groups. each R₃ and R₄ is independently selected from hydrogen and the R₁ substituents; each of the above alkyl groups or moieties is straight or branched chain of 1-20 carbons; each aryl group contains 6-10 ring carbons; each cycloaliphatic group contains from 4-8 ring carbons; and each Y is independently selected from the elements P, As, Sb and Bi.
The invention process comprises
(1) contacting a biaryl compound having the structural formula: with a proton abstracting agent under conditions suitable to form a biaryl dianion, which is then (2) contacted with a Group V compound of the formula: wherein X′ is halogen or a suitable leaving group.
摘要:
A process for preparing a diaryl or a mixture of diaryls represented by any or a combination of the following formulae (II), (III), and (IV), characterized in that a diaryliodonium salt represented by the following formula (1) is reacted in a solvent in the presence of a transition metal catalyst and a reducing metal at a temperature in the range of room temperature to 100°C:
wherein Ar 1 and Ar 2 , which may be alike or different, are each an aryl group which may have a substituent group or groups and X⊖ is a counter ion which is inert to said reaction.
摘要翻译:一种由下式(II),(III)和(IV)的任何一种或其组合表示的二芳基或二芳基的混合物的制备方法,其特征在于,由下式(I)表示的二芳基碘盐反应 在一种溶剂中,在过渡金属催化剂和还原金属存在下,在室温至100℃的温度范围内:[Ar1-I(+)> - Ar2] X( - ) )... Ar 1 -Ar 1(II)... Ar 1 -Ar 2(III)... Ar 2 -Ar 2(IV)...其中Ar 1和Ar 2可以相同或不同,各自为可以具有取代基或基团的芳基,X <( - )>是对所述反应呈惰性的抗衡离子。
摘要:
Chemical process for degrading halogenated organic compound having at least one C-halogen group and preferably a plurality of such groups to remove halogen atoms from said compound by treating it with ultra-violet (UV) radiation (2) and hydrogen (6) preferably, though not necessarily in alkaline liquid solution. Process for degrading such compound which is capable of forming alkali metal salts by treating it in aqueous alkaline solution with UV radiation (2). The process can be used generally as a means for dehalogenation and is particularly useful in the treatment of contaminated effluent wastes from manufacturing processes or from contaminated water, soil, sludges or other wastes already present in the environment. An example of a compound effectively treated by the processes of the invention is kepone, decachloropentacyclo (5.3.0.02,6.03,9.04,8) decan-5-one.
摘要:
erbindungen der Formel I worin Z, Z 1 , R, m und p die im Patentanspruch 1 angegebene Bedeutung haben, können nach einem neuen Verfahren auf einfache und wirtschaftliche Weise dadurch erhalten werden, daß man ein Halogenid der Formel II in Gegenwart einer Base und bestimmter Palladiumkatalysatoren, wie Palladiumacetat, mit gegebenenfalls substituierten Vinylbenzol- oder Vinylnaphthalinderivaten umsetzt. Die Verbindungen (I) oder daraus herstellbare funktionelle Derivate eignen sich z.B. zur Herstellung von bekannten Farbstoffen oder optischen Aufhellern oder können direkt als optische Aufheller oder als Scintillatoren verwendet werden.