556-82-1Relevant articles and documents
Configurational Stability of a Cyclopropyl Grignard Reagent Containing a Metalated 2-Hydroxymethyl Group
Richey, Herman G.,Moses, L. Meredith
, p. 4013 - 4017 (1983)
Mixtures of cis- and trans-2-bromo-3-(hydroxymethyl)-1,1-dimethylcyclopropane were treated with methylmagnesium bromide to metalate the hydroxyl groups and then with magnesium to form metalated Grignard reagents.The compositions of products obtained upon hydrolysis with D2O indicated that the metalated Grignard reagents in refluxing diethyl ether did not undergo significant cis-trans isomerization.This work provides an example of the configurational stability of a cyclopropyl Grignard reagent with a secondary rather than a tertiary α-carbon.Because of these resultswith cyclopropyl Grignard reagents containing a metalated hydroxyl group, prior observations on additions of allylic Grignard reagents to 3-(hydroxymethyl)cyclopropenes only of products resulting from a cis relationship of magnesium and hydroxymethyl must be due to the stereochemistry of the addition process rather than to a subsequent isomerization.
Reaction of Methylbutenol with Hydroxyl Radical: Mechanism and Atmospheric Implications
Rudich, Yinon,Talukdar, Ranajit,Burkholder, James B.,Ravishankara, A. R.
, p. 12188 - 12194 (1995)
The tropospheric fate of 2-methyl-3-buten-2-ol (methylbutenol, MBO), a recently identified emission by vegetation, was investigated by measuring its UV absorption cross sections (210-300 nm) and the rate coefficient for its reaction with hydroxyl free radicals.UV absorption cross sections were found to be too small for photolysis to be an important removal pathway for MBO in the troposphere.The rate constant applicable under tropospheric conditions for the reaction of OH with MBO was determined to be k=(8.2 +/- 1.2) * 10-12 e((610 +/- 50)/T) cm3 molecule-1 s-1.The OH reaction proceeds mainly via addition of the OH to the double bond in MBO.In the absence of O2, about 15-20percent of the adducts eliminate the alcohol-OH group.However, O2 can scavenge the adduct before it decomposes at T 300 K.This mechanism was confirmed by measuring the rate coefficients for the reactions of OD and 18OH and determining the rate coefficient for the OH reaction in the presence of 7-13 Torr of O2 and in SF6 buffer gas.The elimination of alcohol-OH group was substantiated by observing OH production in the reactions of 18OH and OD.The obtained OH reaction rate coefficient suggests that the primary daytime loss of MBO in the troposphere is via its reaction with OH.
Metal oxide coated ceramic corrugated plate catalyst, preparation and application in preparation of key intermediates of citral
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Page/Page column 9, (2021/04/14)
The present disclosure belongs to the technical field of catalysis, and particularly relates to a metal oxide coated ceramic corrugated plate catalyst, its preparation method and application thereof in preparation of key intermediates of citral. The catalyst consists of a ceramic corrugated plate carrier and a metal oxide active layer coated on a surface of the carrier, wherein the metal oxide active layer is a metal oxide formed by active ingredient titanium and at least four other metal elements selected from vanadium, chromium, manganese, iron, zirconium, niobium and molybdenum.
Preparation method of 3-methyl-2-butenol
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Paragraph 0026-0027; 0028-0029; 0030-0031; 0032-0049, (2020/12/08)
The invention provides a preparation method of 3-methyl-2-butenol. The preparation method comprises the following steps: carrying out an isomerization reaction on 2-methyl-3-butene-2-ol in a tubular reactor under the catalysis of a ruthenium catalyst to obtain the 3-methyl-2-butenol. No solvent is added in a reaction process, 2-methyl-3-butene-2-ol is subjected to the isomerization reaction in thetubular reactor to obtain a mixture of the 3-methyl-2-butene-2-ol and the 2-methyl-3-butene-2-ol, the mixture is rectified and separated to obtain the pure 3-methyl-2-butene-2-ol, and the 3-methyl-2-butene-2-ol obtained through recovery is returned to a reaction process, and continues to participate in the reaction. The method has the advantages of simple process flow, few side reactions, high reaction selectivity and high conversion rate.