- Preparation method of 4,4'-dialkoxy methyl diphenyl ether
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The invention provides a preparation method of 4,4'-dialkoxy methyl diphenyl ether. The method comprises the following steps: conducting a bromination reaction of bromine, 4,4'-dimethyl diphenyl ether and an initiator in an organic solvent to obtain a brominated product; cooling the brominated product with sodium alcoholate to obtain an etherification reaction system; and heating the etherification reaction system for an etherification reaction to obtain the 4,4'-dialkoxy methyl diphenyl ether. Compared with the prior art, the preparation method provided by the invention can greatly increase the product purity on the premise of guaranteeing the yield. The result of the embodiment of the invention indicates that the yield of 4,4'-dialkoxy methyl diphenyl ether prepared by the method is over 50%, and the product purity is higher than 99.5%.
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Paragraph 0128-0136
(2017/01/19)
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- Ionic halomethyl-1,3,5-triazine photoinitiators
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Novel water-soluble triazine photoinitiators and bifunctional ionic photoinitiators having an anion containing a photo-labile halomethyl-1,3,5-triazine and a photoinitiator cation are described. The ionic compounds are good photointiators for initiating free radical and acid sensitive reactions. The ionic photoinitiators are easily synthesized and eliminate the need for a combination of photoinitiators in a photocurable, photopolymerizable, or photoacid sensitive composition. Additionally, the radiation-sensitive compounds are resistant to migration in photosensitive compositions. The ionic photoinitiators are particularly useful in compositions for use in printing, duplication, copying, and other imaging systems.
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