7465-16-9Relevant articles and documents
Preparation method of 3-bromo-4-hydroxybenzaldehyde
-
Paragraph 0036-0038, (2020/02/19)
The invention discloses a preparation method of 3-bromo-4-hydroxybenzaldehyde. The preparation method comprises the following steps: (1) carrying out a bromination reaction on p-hydroxybenzene methylal and bromine to obtain 3-bromo-4-hydroxybenzene methylal; and (2) carrying out a hydrolysis reaction on the 3-bromo-4-hydroxybenzene methylal obtained in the step (1), and carrying out post-treatmentafter the reaction is finished to obtain the 3-bromo-4-hydroxybenzaldehyde. According to the preparation method, aldehyde is replaced with acetal for the bromination reaction, so that generation of adibromo product is effectively avoided, the yield and purity of a monobromo product are improved, and industrialization is facilitated.
Bronsted acidic ionic liquids as efficient and recyclable catalysts for protection of carbonyls to acetals and ketals under mild conditions
Du, Yuying,Tian, Fuli
, p. 2703 - 2708 (2007/10/03)
A series of acidic ionic liquids have been used as efficient catalysts for the protection of various carbonyl compounds at room temperature. The features of mild conditions, satisfactory isolated yield, simple workup, and the recyclability of the catalyst were present in this process. Copyright Taylor & Francis, Inc.
An efficient and versatile procedure for the synthesis of acetals from aldehydes and ketones catalyzed by lithium tetrafluoroborate
Hamada, Nao,Kazahaya, Kiyoshi,Shimizu, Hisashi,Sato, Tsuneo
, p. 1074 - 1076 (2015/10/07)
Acetals are obtained in good to excellent yields by treatment of aldehydes and ketones with trialkyl orthoformate and the corresponding alcohol in the presence of a catalytic amount of lithium tetrafluoroborate. Due to the mild reaction conditions, this method is compatible with acid-sensitive substrates.