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• 107-86-8 3,3-dimethyl acrylaldehyde 
• 556-82-1 3-methyl-2-buten-1-ol 

Relevant academic research and scientific papers

Preparation of Ga2O3 doped sulfonated Tin oxides as a highly active and recyclable heterogeneous solid acid catalyst for aldol reactions

Ga2O3 doped sulfonated tin oxide catalysts were prepared via co-condensation method in ethanol solvent, followed by sulfonation and calcination. The samples were characterized by isothermal nitrogen adsorption/desorption, powder X-ray diffraction (XRD), thermal gravimetric analysis (TG), Raman spectra and DRIFT spectra. The number of acid sites on the catalysts was measured with the potentiometric titration of butyl amine. The results showed that the addition of small amounts of Ga2O3 to sulfonated tin oxide resulted in an enhanced acid site density, which makes Ga2O3 doped sulfonated tin oxide catalysts highly active for aldol reactions. The catalyst containing 1.5% Ga2O3 exhibited much higher activity than those of SO2-4 /SnO2, SO2-4 /ZrO2 and H3PO4 in aldol condensation of prenal and prenol for citral precursor, which is a important in fragrance industry. Besides the high activity, the catalyst also exhibited good recyclability, making 1.5% GST an efficient and promising solid catalyst for aldol reactions.

A 3-methyl-2-butene-1- aldehyde two heteroploid pentene yl acetal preparation method

The invention discloses a preparation method of 3-methyl-2-butylene-1-aldehyde diisopentenyl acetal. Firstly, isopentenyl alcohol, methylcrotonaldehyde and a catalyst are subjected to a reaction in a pre-reactor to reach thermodynamic equilibrium and then enter a reactive distillation tower with a partition wall, water generated from a condensation reaction at the left side of the partition wall is separated in an oil-water separator at the tower top, excess isopentenyl alcohol and un-reacted methylcrotonaldehyde in the reaction at the right side of the partition wall are condensed through a tower top condenser and recycled, and at the same time, the high-purity 3-methyl-2-butylene-1-aldehyde diisopentenyl acetal can be obtained in a tower kettle. The method has the advantages of compact equipment, less investment, and small land occupation area, and besides, can reduce energy consumption; especially, the high-purity 3-methyl-2-butylene-1-aldehyde diisopentenyl acetal can be obtained in the tower kettle at one time, and secondary distillation steps are reduced.

Continuous process for the production of acetals

Preparation of acetals by reaction of 1 mol. of an unsaturated aldehyde with 1 mol. of an unsaturated alcohol in presence of an acid as catalyst and with separation of the water of reaction is effected by partly reacting the reactants in a column, concentrating the obtained acetal in ≥ 2 sequential evaporation steps and then recycling the recovered reactants to the reaction column. Preparation of acetals (I) by reaction of 1 mol. of an unsaturated aldehyde (II) with 1 mol. of an unsaturated alcohol (III) in presence of an acid as catalyst and with separation of the water of reaction is effected by partly reacting the reactants in a column, concentrating the obtained acetal in ≥ 2 sequential evaporation steps and then recycling the recovered reactants to the reaction column. R - R = H or optionally substituted 1-6C alkyl; and R = H, an optionally mono- or poly-unsaturated, optionally substituted 1-12C alkyl or an optionally substituted 3-12-membered optionally mono- or poly-unsaturated carbon ring.

Process for the preparation of aldehydes

A multi-step process for the preparation of alpha,beta-unsaturated aliphatic aldehydes such as citral by first reacting an allylic alcohol with a butadienyl ether, or a corresponding acrolein derivative or its acetal, including novel intermediates in this process.