Epoxidation of Monomaleate with Hydrogen Peroxide Catalyzed by [π-C5H5N(CH2)15CH3]3PO4(WO3)4
摘要:
In the study, epoxidation of dodecanol monomaleate, hexadecanol monomaleate, and octadecanol monomaleate were carried out using [pi-C5H5N(CH2)(15)CH3](3)PO4(WO3)(4) as phase-transfer catalyst with 30% hydrogen peroxide as oxidant. The experimental results showed that [pi-C5H5N(CH2)(15)CH3](3)PO4(WO3)(4) had excellent catalytic effect on translating C-C double-bond into an epoxy group and had a good yield rate. The synthesized epoxides of decanol monomaleate, hexadecanol monomaleate, and octadecanol monomaleate have enormous potential application in organic synthesis, and they could be readily transformed into various synthetically useful intermediates or final products in many fields of chemistry.
Abstract Homologous series of crystallisable C8-C22 even-numbered alkane oligomers with either maleate or itaconate monoesters end-groups were synthesized. Their total phase change enthalpy (ΔHtpce) and entropy (ΔStpce) on melting, determined by DSC, show a linear dependence with the number of carbons of the alkyl chain. A comparison was performed with corresponding succinate derivatives. The influence
maleic and succinic acid viz. sodiumlauryl succinate (C12SE), sodiumlauryl maleate (C12ME), sodiumlauryl succinamide (C12SA), sodiumlauryl maleamide (C12MA), sodium hexadecyl succinate (C16SE) and sodium hexadecyl maleate (C16ME) were synthesized and investigated as surfactants in the pure water and aqueous hydrotrope [sodium p-toluene sulfonate (NaPTs)] solution. The chemical structures of the
An unsaturated polyester resin composition for ambient temperature open lay-up moulding contains styrene as an agent for cross-linking during curing, a wax for preventing air inhibition and a compound for allowing reduction of styrene evaporation. The compound is of the formula
where R, is a straight- or branched- chain substituted or unsubstituted aliphatic C6-C24 hydrocarbon, and X is
Such resin compositions are particularly suitable for producing laminates and the abovementioned compounds serve as adhesion-promoting agents. Incorporation of such compounds into the compositions enables larger amounts of the waxy substances to be included by compensating for the loss of adhesion which would otherwise have arisen from the presence of larger quantities of waxy substance.
一种用于常温开层模塑的不饱和聚酯树脂组合物含有苯乙烯(作为固化过程中的交联剂)、蜡(用于防止空气抑制)和化合物(用于减少苯乙烯的蒸发)。化合物的结构式为
其中 R 是直链或支链取代或未取代的脂肪族 C6-C24 烃,X 是
此类树脂组合物特别适用于生产层压板,上述化合物可用作粘合促进剂。在组合物中加入这类化合物,可以补偿因含有大量蜡质物质而造成的附着力损失,从而增加蜡质物质的用量。
Verfahren zum Vernetzen von Organopolysiloxanmassen
申请人:Wacker-Chemie GmbH
公开号:EP0123321A2
公开(公告)日:1984-10-31
Maleinsäurederivate mit der Gruppierung
wobei R' eine Hydroxyl- oder Trimethylsilyloxygruppe ist, oder Maleinimide als Zusatz zur Verzögerung der Vernetzung bei Raumtemperatur in durch Anlagerung von Si-gebundenem Wasserstoff an Vinylgruppen vernetzbaren Organopolysiloxanmassen, wobei diese Anlagerung durch Platinkatalysator gefördert wird.