Abstract: The present invention is directed to novel acyloins, their derivatives, methods for their production and their use for the production of novel epothilones and their derivatives. In addition, the invention is directed to the building blocks for epothilone synthesis, methods for their production and the use of synthetic building blocks for the production of epothilones and their derivatives.

Abstract: Cesium based multimetal oxide compositions which are suitable as catalysts for the gas-phase-catalytic oxidative preparation of methacrolein from isobutene or tert-butanol or its methyl ether. The catalysts are characterized by increased selectivity for the formation of methacrolein. The catalysts have locally delimited regions of an oxide composition, preferably (Bi.sub.2 W.sub.2 O.sub.9), surrounded by the remaining constituents of the multimetal oxide.

Abstract: A method for preparing acrolein or methacrolein comprises subjecting propylene, secondary propanol, isobutylene or tertiary butanol to gas phase catalytic oxidation with molecular oxygen in the presence of a catalyst represented by the following general formula (I):Mo.sub.a Bi.sub.b Fe.sub.c X.sub.d Y.sub.O Z.sub.f O.sub.g (I)wherein X represents at least one element selected from the group consisting of Ni and Co; Y represents at least one element selected from the group consisting of K, Rb, Cs and Tl; and Z represents at least one element selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ce, Ti, Zr, Nb, Cr, W, Mn, Cu, Ag, Zn, Cd, B, Al, Si, Ge, Sn, Pb, P, As, Sb, S, Se and Te; a, b, c, d, e, f and g each represents an atomic ratio of the corresponding element and when a is assumed to be 12, b=0.1.about.10, c=0.1.about.20, d=2.about.20, e=0.01.about.2, f=0.about.

Abstract: Dilute solutions of acrolein are produced on site and on demand by oxidizing propylene in an improved reactor using an improved catalyst, which is a mixture of molybdenum, bismuth and tellurium oxides. The catalyst is deposited on metal particles, which are of a metal selected from the group consisting of aluminum, tantalum, titanium, tungsten, niobium and mixtures thereof, and are packed to form a catalyst bed which provides improved heat transfer and distribution for better control of the process. The reaction is conducted in a reactor in which all the exposed surfaces are made of a metal selected from the group just mentioned. The produced acrolein is absorbed to form a dilute solution of acrolein in a liquid to be treated, such as irrigation water for weed control, or control of hydrogen sulfide in water used for oil and gas field water floods, or in fuel oil to inhibit growth of organisms.

Abstract: A process for improving the activity of tellurium containing metal oxide catalysts useful as catalysts for oxidation, ammoxidation or oxidative dehydrogenation of organic compounds by heating the catalysts together with an activity-improving agent to a temperature up to about 900.degree. C. in a gaseous atmosphere. The process can be effectively applied to deteriorated or spent catalysts, the activity of which has been deteriorated due to use for a long period of time.

Abstract: A regeneration process for tellurium-containing metal oxide catalysts used in the process for oxidation, ammoxidation or oxidative dehydrogenation of organic compounds at a temperature of about 300.degree. C. to about 600.degree. C. The process can be effectively applied to such catalysts which have become partially deactivated during the reaction.

Abstract: Oxide complex catalysts of iron, selenium and tellurium provide good yields of acrylonitrile in the ammoxidation of propylene with high selectivities at low temperature.

Abstract: Mixed oxides of bismuth with other metals of the perovskite structure and having vacant lattice sites in the same lattice positions occupied by bismuth are disclosed as partial oxidation and ammoxidation catalysts. Such oxides are used as catalysts in the improved method of oxidizing an acyclic hydrocarbon of 1-10 carbons having at most one olefinic unsaturation by reacting the acyclic hydrocarbon in the vapor phase with oxygen in the presence of the solid catalyst to form products having carbon, hydrogen and oxygen.

Abstract: Formaldehyde is prepared by dehydrogenation of methanol in the presence of a catalyst containing copper, zinc and tellurium, at from 300.degree. to 750.degree. C.The formaldehyde obtainable by the process of the invention is a disinfectant, tanning agent, reducing agent and valuable starting material for the preparation of synthetic resins, adhesives, plastics and auxiliaries in numerous sectors of industry.

Abstract: In the production of methacrolein by vapor phase catalytic oxidation of isobutylene and/or t-butyl alcohol, an improved process for suppressing the amount of acetone to be by-produced which comprises contacting a gaseous mixture comprising isobutylene or t-butyl alcohol, molecular oxygen and steam with a metal oxide catalyst composition comprising molybdenum and bismuth as the essential metal components, the amount of steam in the gaseous mixture being kept to be not more than 4 mol per mol of isobutylene or not more than 3 mol per mol of t-butyl alcohol.

Abstract: Methacrolein is produced by the catalytic vapor phase oxidation of isobutylene (including compounds converted to isobutylene). The catalyst has the following formula: Mo.sub.a P.sub.b Fe.sub.c Co.sub.d Ni.sub.e Bi.sub.f Te.sub.g Sb.sub.h Cs.sub.i Zr.sub.j X.sub.k O.sub.x wherein a-k represent the number of atoms of the particular element depicted, X is another element and x is the number of oxygens present.