Photoinitiator 4,4'-bis(2,2-dialkoxyacetyl)biphenyl and synthetic method thereof
A dialkoxyacetyl and diethoxyacetyl technology is applied in the application field of photoinitiator 4,4'-dibiphenyl in photopolymerization materials, which can solve problems such as VOC emission and environmental pollution, and achieve optimization Effects of reaction conditions, economical production processes
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[0018] Example 1
[0019] In a 2000-liter reactor, add 600g of ethanol and 238g of 4,4'-diacetyl biphenyl, pass 38g of dry hydrogen chloride gas under ice water cooling, and pass 268g of methyl nitrite at 30-35°C. After completion, the reaction was continued at this temperature for 4 hours, the reaction was stopped, and ethanol was evaporated under reduced pressure to obtain a crude product. Under reduced pressure distillation, 297 g of 4,4'-bis(2,2-dialkoxyacetyl)biphenyl was obtained with a yield of 83.0%.
Example Embodiment
[0020] Example 2
[0021] In a 2000-liter reactor, add 600g of ethanol and 238g of 4,4'-diacetyl biphenyl, pass 42g of dry hydrogen chloride gas under ice water cooling, and pass 268g of ethyl nitrite at 30-35℃. After completion, the reaction was continued at this temperature for 4 hours, the reaction was stopped, and ethanol was evaporated under reduced pressure to obtain a crude product. Under reduced pressure distillation, 298 g of 4,4'-bis(2,2-dialkoxyacetyl)biphenyl was obtained with a yield of 83.2%.
Example Embodiment
[0022] Example 3
[0023] In a 2000-liter reactor, add 600g ethanol and 238g bis(4-diacetylphenyl)methane, pass 38g dry hydrogen chloride gas under ice water cooling, and pass 330g ethyl nitrite at 30-35℃ After passing through, continue to react at this temperature for 4 hours, stop the reaction, and distill off the ethanol under reduced pressure to obtain a crude product. Under reduced pressure distillation, 357 g of 4,4'-bis(2,2-dialkoxyacetyl)biphenyl was obtained with a yield of 86.2%.
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