CAS: 7738-94-5; Chromic Acid

上下游产品

sulfuric acid water chromium(VI) oxide dichromic acidchromium bromine chromate(VI) ion ozone

专利信息

专利号:US-4288608-A
优先权日:1978-06-01
标题:Synthesis of anthracyclines
发明人：JOHNSON FRANCIS; KIM KYOUNG S
权利人:RESEARCH CORP
摘要:There is provided a novel method of synthesizing certain heterocyclic quinones. In particular there is provided a novel and regiospecific synthesis of 9-acetyl-6,11-dihydroxy-4-methoxy-7,8,9,10-tetrahydronaphthacene-5,12-quinone (7,9-dideoxydaunomycinone) which is known intermediate in the synthesis of daunomycinone. There is also provided a method of preparing analogs of 7,9-dideoxydaunomycinone which thus provide for the preparation of known and desired analogs of daunomycinone. Daunomycinone is a known compound which is an intermediate in the preparation of the clinically accepted naturally-occurring antitumor antibiotics daunomycin and its derivitive adriamycin.

专利号:US-5451691-A
优先权日:1992-05-07
标题 :Synthesis of cosmetic ingredients
发明人：CRAWFORD DUNCAN J; RAWLINGS ANTHONY V; SCOTT IAN R
权利人:ARDEN ELIZABETH CO
摘要:A method of synthesis of ω-hydroxy fatty acid containing ceramides having the general structure (1). ##STR1## where A represents CH 2 or --CHâ•?CH--Y represents a residue of a C 14 to C 22 fatty acid having the structure (2) ##STR2## where Z is --OH or an epoxy oxygen n x is an integer of from 12 to 20 n y is an integer of from 20 to 40 n z is 0 or an integer of from 1 to 4 n a is an integer of from 8 to 50 n b is an integer of from 10 to 100 n and n is an integer of from 7 to 27.

专利号:US-3962291-A
优先权日:1974-09-05
标 题:Total synthesis of 11-alkyl steroids
发明人：GARLAND ROBERT B; PAPPO RAPHAEL
权利人:SEARLE & CO
摘要:A novel total synthesis of 11-alkyl steroids, utilizing readily available and inexpensive raw materials, is described. The resulting products are useful and novel pharmacological agents possessing, for example, selective hormonal properties.

专利号:EP-0034338-B1
优先权日:1980-02-14
标题:Catalyst for the synthesis of alcohol mixtures containing methanol and higher alcohols
摘要:1. Catalyst for the synthesis of alcohol mixtures containing methanol and higer alcohols one the basis of starting catalysts containing copper oxide, zinc oxide and, optionally, aluminium oxide, obtainable either by (a) producing from soluble salts of copper, zinc and, optionally, aluminium (principal constituents) by joint precipitation with promoter compounds in an alkaline medium a precipitate which is calcined after removal of the impurity ions ; or by (b) impregnating a mixture of the oxides of copper, zinc, and, optionally, aluminium, with solutions of the promoter compounds and calcining the resultant product ; wherein the promoter compounds represent compounds of chromium, cerium, lanthanum, manganese, thorium or of combinations of these elements, and wherein at any desired stage of production alkali compounds are added.

专利号:US-4489206-A
优先权日:1983-05-13
标 题:Synthesis of (+)-4-demethoxydaunomycinone
发明人：CAVA MICHAEL P; DOMINGUEZ DOMINGO
权利人:ADRIA LAB INC
摘要:It has been found that stereospecific R(-)-4-demethoxy-7-deoxydaunomycinone can be synthesized from the known compound 4-demethoxy-7,9-dideoxydaunomycinone. R(-)-4-Demethoxy-7-deoxy-daunomycinone is an intermediate in the synthesis of (+)-4-demethoxydaunomycinone, the aglycone of the nonnaturally occurring and antitumor active (-)7(S)9(S)-4-demethoxydaunorubicin.

专利号:US-5384335-A
优先权日:1991-03-26
标 题:Methanol synthesis using a catalyst combination of alkali or alkaline earth salts and reduced copper chromite
发明人：TIERNEY JOHN W; WENDER IRVING; PALEKAR VISHWESH M
权利人:UNIV PITTSBURGH
摘要:The present invention relates to a novel route for the synthesis of methanol, and more specifically to the production of methanol by contacting synthesis gas under relatively mild conditions in a slurry phase with a catalyst combination comprising reduced copper chromite and basic alkali salts or alkaline earth salts. The present invention allows the synthesis of methanol to occur in the temperature range of approximately 100°-160° C. and the pressure range of 40-65 atm. The process produces methanol with up to 90% syngas conversion per pass and up to 95% methanol selectivity. The only major by-product is a small amount of easily separated methyl formate. Very small amounts of water, carbon dioxide and dimethyl ether are also produced. The present catalyst combination also is capable of tolerating fluctuations in the H 2 /CO ratio without major deleterious effect on the reaction rate. Furthermore, carbon dioxide and water are also tolerated without substantial catalyst deactivation.