4 results about "Onium compound" patented technology

The application belongs to the technical field of chemical synthesis, and particularly relates to a synthesis method of 2-aryl-2-cyclohexanedione enol ester compounds. The method uses a transition metal complex as a catalyst, and uses a phenyl boronic acid compound and an iodine onium compound as raw materials, first synthesizes a 3-hydroxy-2-aryl-2-cyclohexenone compound, and then synthesizes the 2-aryl-2-cyclohexanedione enol ester compound through acylation. The reaction condition is mild, no additional additives (such as alkali-sodium acetate, expensive silver salt-silver acetate, etc.) need to be added, the C-C bond can be efficiently and quickly constructed, the 2-aryl-2-cyclohexanedione cyclization derivative is obtained, the reaction operation is simple, the reaction time is short, the method has high efficiency and high safety, the substrate range is wide, the functional group tolerance is good, the method conforms to the concept of green chemistry and high atomic economy, and is very suitable for large-scale industrial production.

The invention discloses a synthesis method of an enamine compound and a recycling method of raw materials, and belongs to the technical field of pesticide chemical industry. According to the method, ethyl trifluoroacetoacetate is used as a raw material, substituted phenylacetic acid ammonium is used as an amination reagent, 3-amino-4, 4, 4-ethyl trifluorocrotonate is prepared through a reflux water diversion reaction in a specific organic solvent, and efficient recovery of the amination reagent is achieved through ammonia water mediation. Water generated by reaction is removed in time through reflux water diversion, raw material ester hydrolysis is effectively inhibited, and the yield of enamine is larger than or equal to 98%; and in the recovery process, sublimation is avoided by utilizing the high-boiling-point characteristic of substituted phenylammonium acetate, the problem of condenser blockage is solved, the recovery yield is greater than or equal to 99%, direct application can be realized, the cost is remarkably reduced, and green chemical requirements are met.

Provided is a fluororubber crosslinking composition containing a fluororubber (a) capable of polyol crosslinking and a crosslinking agent (b), the crosslinking agent (b) being at least one selected from the group consisting of a compound represented by general formula (b1) described in the specification, a compound represented by general formula (b2) described in the specification, and a salt of any one of these compounds with an alkali metal, an alkaline earth metal, or an onium compound.

The application discloses a kind of double sulfur ylide compounds, its preparation method and application.The application discloses a kind of compound as shown in formula I: Wherein, m and n are independently 0, 1, 2, 3, 4 or 5;R 7 And R 8 Independently be C1~C6Alkyl, C1~C6Alkoxy, nitro or halogen;E is CO2R 9 ;R 9 C1~C6Alkyl.This double sulfur ylide compound can be used as the difluorocarbene precursor of photo initiation, can release difluorocarbene under room temperature and neutral blue light condition, can realize the gem difluorocyclopropanation reaction of olefin under photocatalysis and the difluoromethylation reaction of alcohol, provides important methodological support for the post modification of functional molecule in medicine, material and the like.