621-62-5Relevant articles and documents
Green method for preparing chloroacetaldehyde dialkyl alcohol from vinyl ether
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Paragraph 0039-0040; 0042-0044, (2020/12/14)
The invention discloses a green method for preparing chloroacetaldehyde dialkyl alcohol from vinyl ether. The method takes alkyl vinyl ether, chlorine and alcohol as raw materials and takes corresponding sodium alcoholate as a nucleophilic reagent and comprises the steps: carrying out electrophilic addition on alkyl ether and chlorine in low-boiling-point solvents such as ethers, hydrocarbons, halogenated hydrocarbons and the like; and after chlorination is finished, adding into an alcoholic solution of sodium alcoholate for nucleophilic substitution to obtain high-yield chloroacetaldehyde dialkyl alcohol, such as chloroacetaldehyde dimethyl acetal, chloroacetaldehyde diethyl acetal and chloroacetaldehyde methylisobutyl alcohol. The method is easy to operate, single in reaction, high in yield, less in side reaction, green and pollution-free; the recovered solvent and alcohol can be repeatedly used; no waste acid or waste water is generated in the whole process, the only byproduct sodium chloride can be used for other industrial purposes, and environment-friendly circulation and zero emission are achieved.
Process for the preparation of vitamin A and intermediate compounds which are useful for this process
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, (2008/06/13)
A process for the preparation of vitamin A which preferably comprises bringing cyclogeranyl sulphone into contact with a C10 aldehyde acetal, halogenating the derivative obtained and then removing the halogen group and the sulphone, removing the acetal group and isomerizing the retinal obtained to the desired configuration. Also disclosed are compounds useful as intermediates in the synthesis of vitamin A and processes for preparation of these intermediate compounds.
Herbicidal composition containing dioxolane, dioxane, or dioxepane derivatives as antidote
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, (2008/06/13)
The invention relates to a herbicidal composition which contains, besides binding, wetting, dispersing, emulsifying agents, solvents and/or surface-active substances, herbicides as active agent of thiocarbamate, carbamate, acid amide or urea type alone or in a combination, furthermore as antidote a compound of the general formula I STR1 wherein R1 and R2, independently of each other, are hydrogen, C1-6 alkyl, C2-6 alkenyl, C1-4 cyanoalkyl, C1-6 haloalkyl, phenyl-C1-4 -haloalkyl, phenyl, halogenphenyl, C1-4 -alkyl-phenyl, C1-4 -alkoxyphenyl, furfuryl; R3 and R4, independently of each other, are hydrogen, C1-18 -alkyl, C2-4 -haloalkyl, C2-4 -cyanoalkyl, C1-4 -alkoxy-C2-4 -alkyl, C5-6 -cycloalkyl, phenyl-C1-4 -alkyl, C3-4 -alkenyl, phenyl-C3-4 -alkenyl, di-C1-4 -alkylamino-C2-4 -alkyl, hydroxy-C2-6 -alkyl, furfuryl, tetrahydrofurfuryl, C1-4 -alkoxy-C2-4 -alkoxy-C2-4 -alkyl; R3 and R4, together, are C2-4 -alkylene, C4 -alkenylene, glucofuranosylene, acetoxy-C3 -alkylene, C1-4 -alkoxy-C3 -alkylene, hydroxy-C3 -alkylene, halogen-C3 -alkylene; wherein the quantity of the antidote lies between 0.01 and 15 parts by weight referred to 1 part by weight of herbicidal agent, furthermore the composition contains altogether 0.1 to 95 percent by weight of the herbicidal agents and the antidote.