As examples of the preferred and especially preferred pole liquids there may be mentioned dialkyl and cycloalkyl ketones, such as acetone, methyl ethyl ketone, diethyl ketone, di-isopropyl ketone, methyl isobutyl ketone, di-isobutyl ketone, methyl isoamyl ketone, methyl n-amyl ketone and cyclohexanone; alkyl esters such as methyl acetate, ethyl acetate, isopropyl acetate, butyl acetate, ethyl formate, methyl propionate, methoxy propylacetate and ethyl butyrate; glycols and glycol esters and ethers, such as ethylene glycol, 2-ethoxyethanol, 3-methoxypropylpropanol, 3-ethoxypropylpropanol, 2-butoxyethyl acetate, 3-methoxypropyl acetate, 3-ethoxypropyl acetate and 2-ethoxyethyl acetate; alkanols such as methanol, ethanol, n-propanol, isopropanol, n-butanol and isobutanol and dialkyl and cyclic ethers such as diethyl ether and tetrahydrofuran.
作为例子，可能有提到，如丙酮和环烷基烷基酮，甲基乙基酮，二乙基酮，二异丙酮，甲基异丁基酮，二异丁基酮，甲基异戊酮，甲基n的首选，特别是喜欢极液体戊酮和环己酮；如醋酸甲酯，醋酸乙酯，醋酸异丙酯，醋酸丁酯，甲酸乙酯，甲基烷基酯丙，甲氧基propylacetate和丁酸乙酯；乙二醇和乙二醇酯和醚，如乙二醇，二乙二醇单乙醚，3 - methoxypropylpropanol，3 ethoxypropylpropanol，二氧基乙基酯，3甲氧酯，3 ethoxypropyl醋酸和2 -乙氧基醋酸；醇类如甲醇，乙醇，正丙醇，异丙醇，正丁醇和异丁醇和二烷基酯和环醚如乙醚和四氢呋喃。
As examples of the preferred and especially preferred pole liquids there may be mentioned dialkyl and cycloalkyl ketones such as acetone methyl ethyl ketone diethyl ketone di-isopropyl ketone methyl isobutyl ketone di-isobutyl ketone methyl isoamyl ketone methyl n-amyl ketone and cyclohexanone; alkyl esters such as methyl acetate ethyl acetate isopropyl acetate butyl acetate ethyl formate methyl propionate methoxy propylacetate and ethyl butyrate; glycols and glycol esters and ethers such as ethylene glycol 2-ethoxyethanol 3-methoxypropylpropanol 3-ethoxypropylpropanol 2-butoxyethyl acetate 3-methoxypropyl acetate 3-ethoxypropyl acetate and 2-ethoxyethyl acetate; alkanols such as methanol ethanol n-propanol isopropanol n-butanol and isobutanol and dialkyl and cyclic ethers such as diethyl ether and tetrahydrofuran.
作为例子，可能有提到，如丙酮和环烷基烷基酮，甲基乙基酮，二乙基酮，二异丙酮，甲基异丁基酮，二异丁基酮，甲基异戊酮，甲基n的首选，特殊是喜欢极液体戊酮和环己酮；如醋酸甲酯，醋酸乙酯，醋酸异丙酯，醋酸丁酯，甲酸乙酯，甲基烷基酯丙，甲氧基propylacetate和丁酸乙酯；乙二醇和乙二醇酯和醚，如乙二醇，二乙二醇单乙醚，3 - methoxypropylpropanol，3 ethoxypropylpropanol，二氧基乙基酯，3甲氧酯，3 ethoxypropyl醋酸和2 -乙氧基醋酸；醇类如甲醇，乙醇，正丙醇，异丙醇，正丁醇和异丁醇和二烷基酯和环醚如乙醚和四氢呋喃。
The present invention relates to the depolymering cyclization reaction of aromatic dithio ether polymer to prepare aromatic cyclic dithio ether compound under the presence of mercapto group containing compound and alkali matter.
本发明涉及利用芳香双硫醚聚合物的解聚成环反应来制备芳香双硫醚环状化合物的方法。该方法采用芳香双硫醚聚合物在含巯基的化合物和碱性物质存在的条件下发生解聚成环反应生成双硫醚环状化合物。
Results show that it is very difficult to get rid of cyclic crown ether and low-molecule-weight oligomer by distillation under negative pressure.
结果表明，通过减压蒸馏除掉环状冠醚和低分子齐聚物难度较大，仅能蒸出少量环状三聚体；而溶剂萃取法则能得到较为理想的结果。
The said process is simple, suitable for large-scale synthesis, high in product yield and low in cost, and the prepared cyclic dithio ether compound may be open-loop polymerized to form polymer again.
本发明方法简单，适合大规模合成，产品收率高，成本低，所制备的双硫醚环状化合物可以通过开环聚合再次形成聚合物。
Particularly, the present invention relates to a preparation method of a solid titanium catalyst for olefin polymerization, which comprises the steps of:(1) preparing a magnesium compound solution by dissolving a magnesium halide compound into a mixed solvent of a cyclic ether and one or more of alcohol; (2) preparing a carrier by adding firstly a titanium halide compound to the magnesium compound solution at low temperature, elevating the temperature of the resulted solution or aging it, and then thereto adding secondly the titanium halide compound additionally; (3) preparing a titanium catalyst by reacting the carrier with a titanium compound and an electron donor; and (4) washing the titanium catalyst with hydrocarbon solvent at high temperature.
特别地，本发明涉及一种用于烯烃聚合的固体钛催化剂的制备方法，该方法包括以下步骤：(1)通过将卤化镁化合物溶于环醚和一种或多种醇的混合溶剂中，制备镁化合物溶液；(2)通过在低温下向镁化合物溶液中第一次加入卤化钛化合物，升高所得溶液的温度或使其老化，然后另外向其中第二次加入卤化钛化合物，而制备载体；(3)通过将载体与钛化合物和电子供体发生反应，制备钛催化剂；和(4)在高温下用烃类溶剂洗涤钛催化剂。
Although gelsemine and koumine both contain an exo-vinyl, an Nb-methyl and most likely a cyclic ether linkage, the structures of the alicyclic parts of these two alkaloids appear also different from each other.
虽然这两种生物碱都含环外乙烯基，Nb-甲基及可能具环醚结构，但是其脂环部分的构造按推断亦不相同。
Laboratory study on the cyclic utilization of sodium dodecyl benzene sulfonate foam Synthesis of sodium octyl diphenyl ether disulfonate and its performance
十二烷基苯磺酸钠泡沫循环利用室内研究辛烷基二苯醚二磺酸钠的合成及性能研究
In the first part, Ring-Opening Polymerization of cyclic poly aryl ether ketone and its application in forming carbon fiber reinforced thermoplastic composites have been investigated firstly.
在第一部分工作中，首先探索了环状聚芳醚酮开环聚合制备热塑性复合材料的方法。
The progresses in the methodology for the reso lution of racemic 1, 1'bi naphthol via cyclic phosphate, carboxylic ester, carbonate, ether, borate, inclusion crys tallization and enzyme catalytic hydrolysis were reviewed.
综述了外消旋1,1'-联-2-萘酚拆分方法学研究进展，包括环磷酸酯法、羧酸酯法、碳酸酯法、环状醚法、环硼酸酯法、包合物结晶法、酶水解法。
The polymerization process involves much interesting information, such as the catalytic conversion rate, polymer/cyclic product selectivity, the carbonate units and ether units selectivity in the polymerization product.
聚合反应过程涉及催化剂转化效率、聚合物与环状碳酸酯选择性、聚合产物中碳酸酯单元与聚醚单元选择性等问题。
MS study of cyclic aryl ether ketone oligomers containing phenolphthalein moiety
含酚酞结构的聚芳醚酮环状齐聚物的激光质谱表征
Synthesis and Properties Study of Poly (aryl ether ketone) Cyclic Oligomer Containing Electroactive Groups
含电活性苯胺链段的聚芳醚酮类环状齐聚物合成和性质研究
Study on Bonded Poly - β - Diketone Type Non-Cyclic Crown Ether HPLC Stationary Phases
多β-二酮型开链冠醚键合液相色谱固定相的研究
Estimation of non-cyclic α - aryl ether units in wood and gramineous lignins
木材和禾草木素中非环α-芳醚键的测定
The electrochemical and ion-sensing properties of crown-ether TTF derivatives were studied by means of cyclic voltammetry.
用循环伏安法研究了上述目标化合物的电化学性质和离子传感性质。
The progresses in the methodology for the reso lution of racemic 1,1 ′ bi naphthol via cyclic phosphate, carboxylic ester, carbonate, ether, borate, inclusion crys tallization and enzyme catalytic hydrolysis were reviewed.
综述了外消旋1,1′-联-2-萘酚拆分方法学研究进展，包括环磷酸酯法、羧酸酯法、碳酸酯法、环状醚法、环硼酸酯法、包合物结晶法、酶水解法。