A probe into the alkyl′s attracting electron effect;
对烷基吸电子效应的探讨
Alkyl Bonded Silica Phases for High Performance Liquid Chromatography;
高效液相色谱烷基硅胶键合固定相
以氢原子的电负性为标准,对不同结构烷烃的1H-NMR谱中质子的化学位移值、部分有机化合物的13C-NMR谱测定数据、气相条件下醇和胺的酸性结果及其对应的负离子的稳定性等方面进行分析,证实烷基在有机化合物中存在-I效应。
The relation between the stretching vibration frequency of X = 0 double bond of alkyl substituted compounds R' X = 0 and the Polarizability Effect Index (PEI) of alkyl group R can be expressed as v = a + bPEI (R), where X represents C, and N elements.
烷基取代物R’X=0的X=0键伸缩振动频率ν与烷基R的极化效应指数PEI(R)的关系可表示为:ν=a+bPEI(R)。
The results shawed that the Poarizability Effect Ihdex(PE)of alkyl group R decreases the UV absothing eneny of C = 0 bond.
酮R1R2C＝O的羰基C＝O紫外吸收能量△E与烷基R的极化效应指数PEI（R）的关系可表示为：△E=a＋bPEI（R）。
The extraction kinetics of dilute acetic acid aqueous solution is studied with the extraction solvent mixture of trialkylamine,n-caprylic alcohol and kerosene by the constant interface cell method.
以三烷基胺为萃取剂,正辛醇和煤油的混合物为稀释剂,采用恒界面池法,实验研究了稀醋酸水溶液的萃取动力学特性,考察了醋酸的初始浓度、搅拌速率、两相接触面积、萃取温度、萃取剂浓度等因素对醋酸萃取动力学特性的影响。
The extraction performance of Cr(Ⅵ) with trialkylamine from H_2SO_4 medium was studied.
研究三烷基胺(N235)从硫酸介质中对Cr(Ⅵ)的萃取,考察了不同稀释剂、水相酸度、水相中Cr(Ⅵ)的浓度、萃取剂浓度、温度、相比等对萃取的影响。
Using trialkylamine as the complex agent, the n-octanol as “active” polar diluent, the kerosene and toluene as “inert” diluent, the complexation extractions of acetic acid and butyric acid from their dilute solutions were studied respectively.
络合萃取法对极性有机物稀溶液的分离具有高效性和高选择性,今选择醋酸、丁酸为分离对象,三烷基胺为络合剂,正辛醇为极性稀释剂,加氢煤油和甲苯为惰性稀释剂,考察了无机盐硫酸钠、氯化钠、硝酸钠对萃取过程的影响,探讨了分配系数D随盐浓度变化的规律,分析了产生盐析效应的原因,并对实验数据进行关联得到盐析效应的经验公式。
Preparation of complex catalyst SO~(2-)_4/ZrO_2-TiO_2 and its application in reaction for synthesis of alkyl polyglucoside;
SO_4~(2-)/ZrO_2-TiO_2复合催化剂的制备及其在烷基糖苷合成中的应用
Appropriate operation conditions for preparation of alkyl polyglucoside are as follows:reaction temperature 115℃,degree of vacuum 96.
分别采用对甲苯磺酸和十二烷基苯磺酸为催化剂进行了一步法由葡萄糖和月桂醇制备烷基糖苷的工艺研究。
The properties of alkyl polyglucoside(APG) are briefly narrated,i.
简要概述生物基表面活性剂烷基糖苷的物理性和溶解性、表面活性、安全性和生物降解等性能。