摘要:
It has been surprisingly discovered in accordance with the present invention that when 1,3-dioxolane is reacted with formaldehyde in the presence of tert-butyl hydroperoxide and a cobalt initiator, the reaction preferentially involves an addition of the formaldehyde to the 2-methylene group of the 1,3-dioxolane with only minor reaction with the 4-methylene and 5-methylene groups of the 1,3-dioxolane whereby the reaction product that is formed contains significant quantities of 2-hydroxyalkyl-1,3-dioxolanes and only minimal amounts of the undesired methyl formate by-product. 2-Hydroxymethyl-1,3-dioxolane is hydrolyzed with comparative ease to ethylene glycol and the corresponding glycol aldehyde (CHO--CH.sub.2 --OH). The glycol aldehyde in turn can be catalytically hydrogenated to form additional quantities of ethylene glycol.
摘要:
It has been surprisingly discovered in accordance with the present invention that when 1,3-dioxolane is reacted with formaldehyde in the presence of an organic peroxide and an ionizable, at least sparingly soluble metal salt, the reaction preferentially involves an addition of the formaldehyde to the 2-methylene group of the 1,3-dioxolane with only minor reaction with the 4-methylene and 5-methylene groups of the 1,3-dioxolane whereby the reaction product that is formed contains significant quantities of 2-hydroxyalkyl-1,3-dioxolanes. 2-Hydroxyalkyl-1,3-dioxolanes are hydrolyzed with comparative ease to ethylene glycol and the corresponding glycol aldehyde (CHO--CH.sub.2 --OH). The glycol aldehyde in turn can be catalytically hydrogenated to form additional quantities of ethylene glycol.
摘要:
It has been surprisingly discovered in accordance with the present invention that when dimethoxymethane is reacted with formaldehyde in the presence of an organic peroxide, the reaction preferentially involves an addition of the formaldehyde to the dimethoxymethane to provide a reaction product containing alkyl glycolates such as methyl glycolate and ethyl glycolate as principle products of the reaction. The alkyl glycolates are useful as raw materials for the manufacture of ethylene glycol.
摘要:
It has been surprisingly discovered in accordance with the present invention that when 1,3-dioxolane is reacted with formaldehyde in the presence of an organic peroxide, the reaction preferentially involves an addition of the formaldehyde to the 2-methylene group of the 1,3-dioxolane with only minor reaction with the 4-methylene and 5-methylene groups of the 1,3-dioxolane whereby the reaction product that is formed contains significant quantities of 2-hydroxymethyl-1,3-dioxolane. 2-Hydroxymethyl-1,3-dioxolane is hydrolyzed with comparative ease to ethylene glycol and the corresponding glycol aldehyde (CHO--CH.sub.2 --OH). The glycol aldehyde in turn can be catalytically hydrogenated to form additional quantities of ethylene glycol.
摘要:
Substantially quantitative yields of bibenzyl hydroperoxide and bibenzyl dihydroperoxide can be obtained when oxygen is reacted with bibenzyl (1,2-diphenylethane) in the presence of a minor amount of sodium bicarbonate at a temperature within the range of about 100.degree. to about 160.degree. C. to provide an oxidation product wherein the bibenzyl is substantially selectively converted to the bibenzyl hydroperoxides. The bibenzyl hydroperoxides can be used as raw materials for the production of propylene oxide by reacting the bibenzyl hydroperoxides with propylene.
摘要:
A process for simultaneously producing an epoxide and a carboxylic acid from an olefin and an aldehyde, respectively, by co-oxidation over a catalyst in the presence of oxygen is described. The catalyst is made by precipitating silver oxide in the presence of copper(II) oxide, copper(II) borate or a mixture thereof. These novel heterogeneous catalysts provide higher selectivities to the epoxide than those obtainable with commercial catalysts.
摘要:
The oxidation of isobutane in the presence of a novel, soluble catalyst of the formula Fe.sub.3 O(Pivalate).sub.6 (MeOH).sub.3 Cl is disclosed. Tertiary-Butyl alcohol, tertiary-butyl hydroperoxide, and acetone are produced. A significant increase in isobutane conversion is obtained without a large decrease in selectivity to tertiary-butyl alcohol and tertiary-butyl hydroperoxide using a small amount of catalyst. Tertiary-butyl alcohol is useful as a gasoline additive and tertiary-butyl hydroperoxide is used for the production of propylene oxide. Acetone has a variety of uses as well.
摘要:
The synthesis of substituted dioxolanes by direct oxidation of olefins over a molybdenum 8-hydroxyquinoline catalyst in the presence of water is described. An organic solvent such as chlorobenzene may also be employed. Water is essential to the reaction to make the dioxolanes, otherwise olefin oxides are produced. Hence, 4-methyl-1,3-dioxolane and 2,4-dimethyl-1,3-dioxolane were prepared from propylene oxidation, and three isomers of 2,4,5-trimethyl-1,3-dioxolane were prepared from 2-butene oxidation.
摘要:
Lighting devices using selectively permeable barrier elements, graphite sheet materials, and/or browning agent destroyers/sequestering agents are disclosed. In one embodiment a lighting device may include a body or housing with a selectively permeable barrier element, such as a silicone membrane or o-ring to allow diffusion of contaminants from one or more interior volumes to the exterior environment. Contaminants may be mitigated through use of a sequestering agent/browning agent destroyer. Heat conduction between elements of the housing, such as to aid removal of heat generated from a lighting element such as an LED, may be improved through use of graphite materials, such as PGS sheets between housing elements.
摘要:
A support frame for a drawer-type dishwasher includes a top section and opposing side sections formed from a plurality of support members which define an open lattice work and establish a cavity for a slidable dishwasher drawer. The support frame also includes first and second rail supports that are provided on respective ones of the opposing side sections. The first and second rail supports are designed to support corresponding first and second extensible rails which, in turn, support the wash tub for movement relative to the frame. In addition, the support frame includes lid support elements for a mechanism that provides shifting of a lid member relative to the wash tub.