337P日本大胆欧美裸体艺术_久久久久精品无码专区_一个人看的免费视频WWW中文字幕_欧美熟妇精品视频网免费观看
第 37 卷第 6 期Vol. 37 No. 6
2007 年 12 月Dec 2007

所屬欄目:功能材料

磺酸樹(shù)脂催化合成尼泊金酯的研究
曾立華,李其華,雷春華,尹篤林 (湖南師范大學(xué) 化學(xué)化工學(xué)院,湖南 長(cháng)沙 410081)
摘 要:以對羥基苯甲酸(PHBA)和丁醇為原料,用磺酸樹(shù)脂作催化劑,催化合成了尼泊金丁酯,優(yōu)化反應條件為:n(丁醇) ∶ n(對羥基苯甲酸)=5 ∶ 1,催化劑磺酸樹(shù)脂的用量為對羥基苯甲酸質(zhì)量的21%,反應溫度為回流溫度,反應時(shí)間為5 h。尼泊金丁酯收率可達82.6%,催化劑可重復使用,產(chǎn)品結構用紅外光譜圖進(jìn)行了表征。該方法也適合于合成尼泊金戊酯。
關(guān)鍵詞:尼泊金酯;磺酸樹(shù)脂;催化
中圖分類(lèi)號:TQ225.24  文獻標識碼:A  文章編號:1009-9212(2007)06- 0062-03
Synthesis of Parabens Catalyzed by Sulfoacid Resin
ZENG Li-hua,LI Qi-hua,LEI Chun-hua,YIN Du-lin (Colloge of Chemistry and Chemical Engineering, Hunan Normal Univeisity, Changsha 410081, China)
Abstract:Butyl p-hydroxybenzoate was synthesized from p-hydroxybenzoic acid and butanol with sulfoacid resin as catalyst. The optimum conditions were as follow: ratio of n-butanol, p-hydroxybenzoic acid and sulfonic acid resin was 0.25 mol ∶ 0.05 mol ∶ 1.5 g, refluxing for 5 h using water separator at the reflow reaction temperature. Under the optimal conditions, the yield of butyl p-hydroxybenzoate reached 82.6%. These products were characterized by measuring melting point and IR. The method was also propitious to synthesize amyl p -hydroxybenzoate.
Key words:parabens;sulfoacid resin;catalysis
作者簡(jiǎn)介:曾立華(1964-),女,湖南益陽(yáng)人,副教授, 碩士研究生,研究方向:有機化學(xué)。(E-mail: lihuazeng222@126.com)
收稿日期:2007-11-06
337P日本大胆欧美裸体艺术_久久久久精品无码专区_一个人看的免费视频WWW中文字幕_欧美熟妇精品视频网免费观看