Benzaldehyde preparation method and use
Release time:
2023/01/03
Add 90mL of 5% active chlorine sodium hypochlorite solution to a 500mL three-necked flask, adjust the pH to 9~10 with sulfuric acid and potassium carbonate, add 4.5g of 10% tetrabutylammonium bromide solution, 3.0mL of benzyl alcohol, and 75mL of dichloromethane , The reaction was stirred at room temperature for 2h. The organic phase was separated, the aqueous phase was extracted with dichloromethane 3 to 4 times, and the extract was combined with the organic phase. Dry with anhydrous magnesium sulfate, distill off the solvent, distill under reduced pressure, collect the fraction at 60~62℃/1333Pa, which is benzaldehyde.
Preparation
Add 90mL of 5% active chlorine sodium hypochlorite solution to a 500mL three-necked flask, adjust the pH to 9~10 with sulfuric acid and potassium carbonate, add 4.5g of 10% tetrabutylammonium bromide solution, 3.0mL of benzyl alcohol, and 75mL of dichloromethane , The reaction was stirred at room temperature for 2h. The organic phase was separated, the aqueous phase was extracted with dichloromethane 3 to 4 times, and the extract was combined with the organic phase. Dry with anhydrous magnesium sulfate, distill off the solvent, distill under reduced pressure, collect the fraction at 60~62℃/1333Pa, which is benzaldehyde.
use
【Use 1】Important chemical raw materials, used to make lauric aldehyde, lauric acid, phenylacetaldehyde and benzyl benzoate, etc., also used as spices
【Use 2】Used as a reagent for the determination of ozone, phenol, alkaloids and methylene next to the carboxyl group
【Use 3】 It can be used as a special top fragrance, and used in a small amount in floral fragrance formulas, such as lilac, white orchid, jasmine, violet, acacia, sunflower, sweet bean flower, plum blossom, orange blossom, etc. It can also be used in soap. It can also be used as flavoring in almonds, berries, cream, cherries, coconuts, apricots, peaches, walnuts, plums, vanilla beans, spices and other flavors. It is also used in alcohol flavors such as rum and brandy
【Use 4】 Benzaldehyde is an intermediate of the herbicide wild swallow and the plant growth regulator trinexaline
【Use 5】 GB 2760--1996 stipulates that it is a food spice that is temporarily allowed to be used. It is mainly used to prepare almond, cherry, peach, nut and other flavors, and the dosage can reach 40%. As a flavoring agent for canned cherries in syrup, the dosage is 3ml per kg of syrup
【Use 6】 Intermediates of medicine, dyes and spices. Used in the production of m-oxybenzaldehyde, lauric acid, lauric aldehyde, magenta, benzyl benzoate, benzylidene aniline, benzylidene acetone, etc. Used to blend soap essence, edible essence, etc.
【Use 7】 Organic synthesis, solvent, determination of ozone and methylene next to carbonyl, determination of phenols and alkaloids, preparation of spices
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