Method of preparing alpha,alpha'-di(substituted benzylidene)cyclone ultraviolet radiation absorbent

Abstract

The invention relates to a method for preparing a class of ultraviolet absorber of alpha, alpha'-di(substituted benzilidene)ring ketone, in which various alpha, alpha'-di(substituted benzilidene)ring ketone compounds, alpha, alpha'-di(substituted benzilidene)cyclohexanones compounds and alpha, alpha'-di(substituted benzilidene)cycloheptanone compounds are generated through taking mixed solution of concentrated sulfuric acid with acetic as reaction solution and reacting under room temperature condition. The ultraviolet absorber of alpha, alpha'-di(substituted benzilidene)ring ketone compounds has stable chemical properties, can intensely absorb ultraviolet, in which its absorption range is 230-400n, and it can be used as wide spectrum ultraviolet absorbent.

Description

technical field

[0001] The present invention relates to properties and preparation methods of α,α'-bis(substituted benzylidene)cyclic ketones used as ultraviolet absorbers. More specifically α,α'-bis(substituted benzylidene)cyclopentanone, α,α'-bis(substituted benzylidene)cyclohexanone, α,α'-bis(substituted benzylidene)cyclohexanone Properties and preparation methods of ketones as ultraviolet absorbers. Background technique

[0002] Ultraviolet light refers to the part of the wavelength range of light in the range of 200nm to 400nm. Ultraviolet rays can be divided into short-wave ultraviolet rays (UVC) from 190nm to 280nm, medium-wave ultraviolet rays (UVB) from 280nm to 320nm, and long-wave ultraviolet rays (UVA) from 320nm to 400nm. Long-term exposure to UV radiation can cause sunburn, premature aging of the skin, and damage to the immune cells in the skin. Cause systemic immune function suppression, ultraviolet radiation can also lead to skin cancer in severe cases. U...

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