CAS: 25167-20-8; 1,1,1,2-Tetrabromoethane

专利信息

专利号:US-4111933-A
优先权日:1976-04-30
标题:Protection of functional groups during reaction and their subsequent restoration
发明人：ECKERT HEINER; UGI IVAR; KABBE HANS-JOACHIM
权利人:BAYER AG
摘要:In the process for preparing an organic compound of the formula n n A' -- X n n in which n X is an amino group, a hydroxyl group or a carboxyl group, and n A' is the remainder of the molecule, from an organic compound of the formula n n A -- X n n in which n A is the remainder of the molecule which can undergo reaction to form A', by converting A -- X into a compound of the formula n n A -- Z -- COOR n n in which n Z is --NH--, --O-- or a direct C--C bond, and n R is a radical of the formula ##STR1## IN WHICH Y is a direct C--C single bond, the --CHâ•?CH-- group or an arylene group, n R 1 to R 4 each independently is hydrogen, halogen or an alkyl, aryl, aralkyl, alkoxycarbonyl, alkylaminocarbonyl, arylaminocarbonyl or cycloalkylaminocarbonyl radical, or n R 1 + r 2 and R 3 + R 4 each independently completes a 5- or 6-membered carbocyclic ring, or n R 1 and R 3 conjointly with the grouping --C--Y--C-- forms a carbocyclic ring with 5 or 6 carbon atoms, and Hal is halogen, n Thereby to protect X, then converting A -- Z -- COOR into a compound of the formula n n A' -- Z -- COOR n n and then treating the compound A' -- Z -- COOR to restore the group X, the improvement which comprises effecting the treatment of the compound A' -- Z -- COOR with an alkali metal compound of a complex of monovalent cobalt. The process is applicable particularly to aminocarboxylic acids including intermediates from various stages of the synthesis of penicillins and cephalosporis.

专利号:US-7833926-B2
优先权日:2005-07-01
标题 :Arylphenoxy catalyst system for producing ethylene homopolymer or copolymers of ethylene and α-olefins
发明人：WOO TAE WOO; OK MYUNG AHN; HAHN JONG SOK; LEE MAL-OU; KANG SANG OOK; KO SUNG-BO; KIM TAE-JIN; KIM SUNG-KWAN
权利人:SK ENERGY CO LTD
摘要:The present invention relates to an arylphenoxy catalyst system producing an ethylene homopolymer or copolymers of ethylene and α-olefins, and a method of producing an ethylene homopolymer or copolymers of ethylene and α-olefins having a high molecular weight under a high temperature solution polymerization condition using the same. The catalyst system includes a group IV arylphenoxy-based transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst. In the transition metal catalyst, a cyclopentadiene derivative and arylphenoxide as fixed ligands are located around the group IV transition metal, arylphenoxide is substituted with at least one aryl derivative and is located at the ortho position thereof, and the ligands are not crosslinked to each other. The catalyst includes an environmentally-friendly raw material, synthesis of the catalyst is economical, and thermal stability of the catalyst is excellent. It is useful for producing an ethylene homopolymer or copolymers of ethylene and α-olefins having various physical properties in commercial polymerization processes.

专利号:US-4356308-A
优先权日:1980-04-05
标 题 :Process for the preparation of 2,2,6,6-tetramethylpiperidone-4
发明人：WIEZER HARTMUT; NOWY GUENTHER; HAEBERLEIN HARALD
权利人:HOECHST AG
摘要:In the synthesis of 2,2,6,6-tetramethylpiperidone-4 (triacetone-amine) from acetone and ammonia, a partially halogenated or perhalogenated aliphatic or cyclic hydrocarbon is used as catalyst in an amount of from 0.01 to 5 mol %, relative to acetone.

专利号:US-2025164360-A1
优先权日:2022-06-09
标 题:On-slide synthesis of a schiff reagent
发明人：BIRD JEAN MARIE; CANTORIA MARY JO CASTRO; DURRANT EDWARD E; HANNON ANDREW
权利人:VENTANA MED SYST INC
摘要:The present disclosure is directed to compositions, kits, and methods for synthesizing a Schiff's reagent in situ, i.e., directly on a substrate, such as within a puddle disposed on the surface of a substrate. In some embodiments, the kits comprise at least a dye composition and a sulfite composition. In some embodiments, the dye composition comprises a compound having a 4-Benzhydrylidene-2,5-cyclohexadien-1-imine core functionalized to include at least two substituted or unsubstituted amine groups, wherein the compound has a molecular weight ranging from between about 300 g/mol to about 600 g/mol. In some embodiments, the dye composition optionally includes an acid. In some embodiments, the sulfite composition comprises a sulfite or SO2 source.

专利号:US-6657068-B2
优先权日:2002-03-22
标题:Liquid phase oxidation of halogenated ortho-xylenes
发明人：COLBORN ROBERT EDGAR; HALL DAVID BRUCE; KOCH PETER; OECKEL GERALD
权利人:GEN ELECTRIC
摘要:A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful in the synthesis of polyetherimide.

专利号:US-6649773-B2
优先权日:2002-03-22
标题:Method for the manufacture of halophthalic acids and anhydrides
发明人：COLBORN ROBERT EDGAR; HALL DAVID BRUCE; KOCH PETER; OECKEL GERALD
权利人:GEN ELECTRIC
摘要:A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful in the synthesis of polyetherimide.