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摘要本文简要介绍了有机硼酸酯的多种合成方法及其在有关方面的应用,并对微波技术及其在有机合成方面的应用作了简单的介绍。在此基础上,主要研究了硼酸与新戊二醇的反应,通过实验探...
摘要
本文简要介绍了有机硼酸酯的多种合成方法及其在有关方面的应用,并对微波技术及其在有机合成方面的应用作了简单的介绍。在此基础上,主要研究了硼酸与新戊二醇的反应,通过实验探索其反应的形式及其合适的反应条件,并用微波加热作对比,说明微波技术应用在有机合成中的优势。
实验表明,在硼酸与新戊二醇的比例不同的情况下,其反应形式不同,有三种不同比例的反应存在。其合适的反应温度在140℃,反应时间为50-60分钟。
与普通加热相比,在微波加热作用下,其反应时间大大缩短,产品的产率也有所提高。与传统的加热方式相比,微波加热具有反应时间短,产率高,安全可靠,操作方便,节能环保的特点。
对于硼酸酯中硼含量的测定,采用酸碱滴定的方法。硼酸酯水解后在甘露醇的作用下,使硼酸的酸性得到强化,其Ka1由原来的Ka1=5.8×10- 10提高到Ka≈n×10- 6,从而可用氢氧化钠标准溶液定量滴定。同时,采用溴甲酚绿-甲基红指示剂与酚酞指示剂配合指示调控游离酸的终点,使滴定终点灵敏、结果准确。
通过实验表明,用酸碱滴定测定硼含量的方法,终点变色灵敏、结果准确。 展开
本文简要介绍了有机硼酸酯的多种合成方法及其在有关方面的应用,并对微波技术及其在有机合成方面的应用作了简单的介绍。在此基础上,主要研究了硼酸与新戊二醇的反应,通过实验探索其反应的形式及其合适的反应条件,并用微波加热作对比,说明微波技术应用在有机合成中的优势。
实验表明,在硼酸与新戊二醇的比例不同的情况下,其反应形式不同,有三种不同比例的反应存在。其合适的反应温度在140℃,反应时间为50-60分钟。
与普通加热相比,在微波加热作用下,其反应时间大大缩短,产品的产率也有所提高。与传统的加热方式相比,微波加热具有反应时间短,产率高,安全可靠,操作方便,节能环保的特点。
对于硼酸酯中硼含量的测定,采用酸碱滴定的方法。硼酸酯水解后在甘露醇的作用下,使硼酸的酸性得到强化,其Ka1由原来的Ka1=5.8×10- 10提高到Ka≈n×10- 6,从而可用氢氧化钠标准溶液定量滴定。同时,采用溴甲酚绿-甲基红指示剂与酚酞指示剂配合指示调控游离酸的终点,使滴定终点灵敏、结果准确。
通过实验表明,用酸碱滴定测定硼含量的方法,终点变色灵敏、结果准确。 展开
2个回答
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摘要
本文简要介绍了有机硼酸酯的多种合成方法及其在有关方面的应用,并对微波技术及其在有机合成方面的应用作了简单的介绍。在此基础上,主要研究了硼酸与新戊二醇的反应,通过实验探索其反应的形式及其合适的反应条件,并用微波加热作对比,说明微波技术应用在有机合成中的优势。
实验表明,在硼酸与新戊二醇的比例不同的情况下,其反应形式不同,有三种不同比例的反应存在。其合适的反应温度在140℃,反应时间为50-60分钟。
与普通加热相比,在微波加热作用下,其反应时间大大缩短,产品的产率也有所提高。与传统的加热方式相比,微波加热具有反应时间短,产率高,安全可靠,操作方便,节能环保的特点。
对于硼酸酯中硼含量的测定,采用酸碱滴定的方法。硼酸酯水解后在甘露醇的作用下,使硼酸的酸性得到强化,其Ka1由原来的Ka1=5.8×10- 10提高到Ka≈n×10- 6,从而可用氢氧化钠标准溶液定量滴定。同时,采用溴甲酚绿-甲基红指示剂与酚酞指示剂配合指示调控游离酸的终点,使滴定终点灵敏、结果准确。
通过实验表明,用酸碱滴定测定硼含量的方法,终点变色灵敏、结果准确。
Abstract
This paper introduces the boric acid ester of a variety of organic synthesis methods and the parties concerned in the application of technology and microwave in organic synthesis and the application of a simple introduction. On this basis, boric acid and a major new study diol response, through experiments to explore its response in the form and the appropriate reaction conditions, and compared with microwave heating that microwave technology applications in organic synthesis advantage.
The experiments show that in the new diol boric acid and the proportion of different circumstances, different forms of its response, the proportion of three different reaction there. The appropriate temperature in the 140 ℃, the reaction time is 50-60 minutes. Compared with ordinary heating in the microwave heating, greatly reducing their reaction time, the yield products also increased. And compared to traditional heating, microwave heating with short reaction time, high-yield, safe, reliable, easy to operate, energy conservation and environmental protection features.
The borate in the determination of boron, using acid-base titration method. Boric acid ester hydrolysis in the role of mannitol, so that the acidity of boric acid have been strengthened, and its Ka1 from Ka1 = 5.8 × 10 - 10 to Ka ≈ n × 10 - 6, which can be used sodium hydroxide solution quantitative standard titration. At the same time, using bromocresol green - methyl red indicator and phenolphthalein indicator control instructions with the free acid end of the titration end sensitive and accurate.
Through experiments showed that the use of boron in acid-base titration method, the end discoloration sensitive and accurate.
本文简要介绍了有机硼酸酯的多种合成方法及其在有关方面的应用,并对微波技术及其在有机合成方面的应用作了简单的介绍。在此基础上,主要研究了硼酸与新戊二醇的反应,通过实验探索其反应的形式及其合适的反应条件,并用微波加热作对比,说明微波技术应用在有机合成中的优势。
实验表明,在硼酸与新戊二醇的比例不同的情况下,其反应形式不同,有三种不同比例的反应存在。其合适的反应温度在140℃,反应时间为50-60分钟。
与普通加热相比,在微波加热作用下,其反应时间大大缩短,产品的产率也有所提高。与传统的加热方式相比,微波加热具有反应时间短,产率高,安全可靠,操作方便,节能环保的特点。
对于硼酸酯中硼含量的测定,采用酸碱滴定的方法。硼酸酯水解后在甘露醇的作用下,使硼酸的酸性得到强化,其Ka1由原来的Ka1=5.8×10- 10提高到Ka≈n×10- 6,从而可用氢氧化钠标准溶液定量滴定。同时,采用溴甲酚绿-甲基红指示剂与酚酞指示剂配合指示调控游离酸的终点,使滴定终点灵敏、结果准确。
通过实验表明,用酸碱滴定测定硼含量的方法,终点变色灵敏、结果准确。
Abstract
This paper introduces the boric acid ester of a variety of organic synthesis methods and the parties concerned in the application of technology and microwave in organic synthesis and the application of a simple introduction. On this basis, boric acid and a major new study diol response, through experiments to explore its response in the form and the appropriate reaction conditions, and compared with microwave heating that microwave technology applications in organic synthesis advantage.
The experiments show that in the new diol boric acid and the proportion of different circumstances, different forms of its response, the proportion of three different reaction there. The appropriate temperature in the 140 ℃, the reaction time is 50-60 minutes. Compared with ordinary heating in the microwave heating, greatly reducing their reaction time, the yield products also increased. And compared to traditional heating, microwave heating with short reaction time, high-yield, safe, reliable, easy to operate, energy conservation and environmental protection features.
The borate in the determination of boron, using acid-base titration method. Boric acid ester hydrolysis in the role of mannitol, so that the acidity of boric acid have been strengthened, and its Ka1 from Ka1 = 5.8 × 10 - 10 to Ka ≈ n × 10 - 6, which can be used sodium hydroxide solution quantitative standard titration. At the same time, using bromocresol green - methyl red indicator and phenolphthalein indicator control instructions with the free acid end of the titration end sensitive and accurate.
Through experiments showed that the use of boron in acid-base titration method, the end discoloration sensitive and accurate.
展开全部
Abstract
This paper introduces the boric acid ester of a variety of organic synthesis methods and the parties concerned in the application of technology and microwave in organic synthesis and the application of a simple introduction. On this basis, boric acid and a major new study diol response, through experiments to explore its response in the form and the appropriate reaction conditions, and compared with microwave heating that microwave technology applications in organic synthesis advantage.
The experiments show that in the new diol boric acid and the proportion of different circumstances, different forms of its response, the proportion of three different reaction there. The appropriate temperature in the 140 ℃, the reaction time is 50-60 minutes. Compared with ordinary heating in the microwave heating, greatly reducing their reaction time, the yield products also increased. And compared to traditional heating, microwave heating with short reaction time, high-yield, safe, reliable, easy to operate, energy conservation and environmental protection features.
The borate in the determination of boron, using acid-base titration method. Boric acid ester hydrolysis in the role of mannitol, so that the acidity of boric acid have been strengthened, and its Ka1 from Ka1 = 5.8 × 10 - 10 to Ka ≈ n × 10 - 6, which can be used sodium hydroxide solution quantitative standard titration. At the same time, using bromocresol green - methyl red indicator and phenolphthalein indicator control instructions with the free acid end of the titration end sensitive and accurate.
Through experiments showed that the use of boron in acid-base titration method, the end discoloration sensitive and accurate.
This paper introduces the boric acid ester of a variety of organic synthesis methods and the parties concerned in the application of technology and microwave in organic synthesis and the application of a simple introduction. On this basis, boric acid and a major new study diol response, through experiments to explore its response in the form and the appropriate reaction conditions, and compared with microwave heating that microwave technology applications in organic synthesis advantage.
The experiments show that in the new diol boric acid and the proportion of different circumstances, different forms of its response, the proportion of three different reaction there. The appropriate temperature in the 140 ℃, the reaction time is 50-60 minutes. Compared with ordinary heating in the microwave heating, greatly reducing their reaction time, the yield products also increased. And compared to traditional heating, microwave heating with short reaction time, high-yield, safe, reliable, easy to operate, energy conservation and environmental protection features.
The borate in the determination of boron, using acid-base titration method. Boric acid ester hydrolysis in the role of mannitol, so that the acidity of boric acid have been strengthened, and its Ka1 from Ka1 = 5.8 × 10 - 10 to Ka ≈ n × 10 - 6, which can be used sodium hydroxide solution quantitative standard titration. At the same time, using bromocresol green - methyl red indicator and phenolphthalein indicator control instructions with the free acid end of the titration end sensitive and accurate.
Through experiments showed that the use of boron in acid-base titration method, the end discoloration sensitive and accurate.
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