对羟基苯甲酸乙酯

HPLC测定龙血竭中对羟基苯甲酸乙酯的含量

HPLC determination of ethyl p-hydroxybenzoate in Dragon 's Blood

对羟基苯甲酸乙酯合成的新方法

New Method of Synthesis for Ethyl p-Hydroxybenzoate

固体超强酸S2O8~（2-）/ZrO2-A12O3催化合成对羟基苯甲酸乙酯

Catalytic Synthesis of Ethyl p-Hydroxybenzoate With the Solid Superacid S_2O_8 ~ ( 2 - ) / ZrO_2-Al_2O_3

本文还进一步考察了JK008催化剂的使用寿命，研究了合成对羟基苯甲酸乙酯的最佳反应条件。

The optimum reaction conditions and the catalyst lifetime were also studied .

目的建立测定龙血竭中对羟基苯甲酸乙酯含量的方法。

Object To establish a HPLC method for determination of ethyl p hydroxybenzoate in Dragon 's Blood .

以对羟基苯甲酸乙酯和3,5二硝基苯甲酸为原料，经多步反应合成了1种新的化合物4-（3,5-二氨基苯甲酰氧基）苯甲酸乙酯。

From 3 , 5-dinitrobenzoic acid and ethyl 4-hydroxybenzoate , a novel bi-Schiff base compound is prepared .

方法：以左旋氧氟沙星为主药，10%硬脂酸、4.6%单硬脂酸甘油脂、0.46%对羟基苯甲酸乙酯、1%甘油，2%十八醇、12%凡士林、2%三乙醇胺组成O/W型乳膏，制备左旋氧氟沙星乳膏。

Methods : Stearic acid 10 % , Wikipedia 4.6 % , Ethylparaben 0.46 % , glycerin 1 % , stearyl alcohol 2 % , Vaseline 12 % and Triethanolamine 2 % were used to prepare levofloxacin cream in the type of O / W.

方法：以对-羟基苯甲酸乙酯为内标，采用反相高效液相色谱法，二极管阵列检测器检测。

Methods : Using ethyl p-hydroxybenzoate as the internal standard .

对甲氧基苯酚或对羟基苯甲酸乙酯在碱催化下与环氧氯丙烷反应生成环氧化物，然后再与各种胺反应得到胺基异丙醇衍生物，它们的结构经1HNMR、质谱和IR确证；

P-methoxyphenol or ethyl p-hydroxybenzoate reacted with epichlorohydrin in the presence of base ( NaOH ), the obtained epoxy was then treated with different amines to give 2-propanol derivatives , their structures were determined by 1H NMR , mass spectrum and IR ;

本文研究了温度和紫外光对食品防腐剂山梨酸、对羟基苯甲酸乙酯的稳定性和防霉效果的影响。

In this paper , the affects of temperature and ultraviolet light on the stability and mildewproof effect of sorbic acid and ethyl-p-hydroxybenzoate used as food preserving agent , was studied .

研究了以对羟基苯甲酸、乙醇为原料、对甲苯磺酸铜为催化剂、合成对羟基苯甲酸乙酯，并讨论了催化酯化的影响因素。

The preparation of ethyl p-hydroxybenzoate by the catalytic reaction ofp-hydroxybenzoic acid with ethanol with copper p-toluene sulfonate as catalyst had been studied .