盐酸三甲胺三氧化铬／硅胶载体试剂的制备及其对苯偶姻体系的氧化

报道了盐酸三甲胺三氧化锆／硅胶载体试剂的制备方法及其对苯偶姻的氧化反应。该试剂制备简单，用于地苯偶姻的氧化，高收率地得到相应的苯偶酰在化合物，并且反应条件温和，产物易分离。     

镁铝复合氧化物载体的制备与性质研究

以硝酸镁和硝酸铝为原料，用氨水溶液作为pH调节剂，采用共沉淀法制备了镁铝复合氧化物载体，研究了制备过程中镁铝比、pH调节剂种类、水解过程pH值的大小、反应温度、焙烧温度及回流晶化温度对复合氧化物载体理化性质的影响。并以RFCC汽油加氢脱硫为探针反应，考察了以镁铝复合氧化物为载体的催化剂选择性加氢脱硫性能。实验结果表明，在镁铝分子比为10、反应温度为80℃、pH值为9.5条件下制备的镁铝复合氧化物载体具有适宜的比表面积和均匀的孔分布，且晶型较完整，结晶度高。以该复合氧化物为载体制备的催化剂具有良好的RFCC汽油选择性加氢脱硫反应性能。     

芳烃氧化催化剂载体的研究

研制出一种内核无孔、表面粗糙、具有良好的导热性与耐磨性的刚玉球载体,其制备流程简单、操作方便。该载体用于制备芳烃选择氧化的表面涂层催化剂时,选择性和活性均较好。以该载体制备的V-Ti-Sb催化剂用于邻二甲苯氯化,苯酐重量收率达110%。并初步用于萘氧化制苯酐、蒽氧化制蒽醌、烷基苯氧化制均苯四甲酸二酐等反应,效果尚好。     

用于部分氧化甲烷制合成气铈基氧载体的性能分析

对铈基氧载体在熔融盐中利用其品格氧直接部分氧化甲烷制合成气的反应性能进行了研究；分别制备了在650，750，850和950℃焙烧下的铈基氧载体，在不同的反应温度下，利用制备的铈基氧载体对甲烷转化率、H2及CO的选择性进行了试验研究，结果表明：750℃下焙烧的铈基氧载体具有最高的活性，反应温度为825℃时，甲烷的转化率达到了96．5％，同时H2的选择性也比其他温度制备的氧载体高；对750℃焙烧下的氧载体分别添加1％MgO和1％TiO2，考察助剂对氧载体反应性能的影响，结果表明：添加1％MgO和1％TiO2能较好的改善氧载体的性能，且添加1％MgO时氧载体的性能最好。     

负载型钌/铝钛复合载体上的二氧化碳甲烷化反应

用浸渍法制备了铝钛复合载体担载的钌催化剂，考察了它们对二氧化碳甲烷化反应的催化性能，结果表明，高TiO2含量载体制备的催化剂的活性和选择性较高，同时考察了反应温度、空速、金属担载量以及添加第二金属组分等对催化剂性能的影响．     

载体化的苯硫酚,苯硒酚阴离子的制备及其反应

应用强碱性离子交换树脂为载体，制备了载体化的苯硫酚，苯硒酚阴离子，并研究了它们与卤代物，环氧化合物及α，β-不饱和醛酮的反应。     

高分子载体Lewis酸催化剂:聚苯乙烯-四氯化锡复合物——制备及其在有机合成中的应用

聚苯乙烯交联白球(含二乙烯基苯7％)与四氯化锡反应可制成一种稳定的高分子载体Lewis酸催化剂,它对酯化、缩醛、缩酮、成醚和付氏烷基化等有机合成反应都具有较高的催化效能,这种高分子载体催化剂不仅催化效率高、性能稳定,而且制备简单,使用操作方便,易于从反应体系中分离,无污染,是一种很有前途的新型催化剂。     

以高分子为载体的Lewis酸催化剂: 苯乙烯、甲基丙烯酸甲酯共聚物-四氯化钛复合物的制备及其在有机合成中的应用

本文将在空气中极易水解的Lewis酸四氯化钛与苯乙烯和甲基丙烯酸甲酯的共聚物小球反应, 制成了一种十分稳定的高分子载体Lewis酸催化剂, 证明它对酯化,缩醛, 缩酮等反应有较高的催化活性, 并可重复使用, 回收再生. 由于它制备简单, 操作方便, 易于从反应体系中分离、无污染, 因此具有良好的应用前景.     

Ni／Al2O3上甲烷二氧化碳氧气转化制备合成气的研究

在固定床流动反应装置上，从活性组分的负载量，载体的焙烧温度、反应温度，空速等几个方面考察了Ｎｉ／Ａｌ２Ｏ３催化剂对ＣＨ４－ＣＯ２－Ｏ２转化制备合成气的催化活性，发现采用１１００℃焙烧的γ－Ａｌ２Ｏ３载体制备的镍负载量为９．１７ｗ％的Ｎｉ／Ａｌ２Ｏ３催化剂。     

由亲水和疏水硅胶制备的Co/Ru/SiO2催化剂的表征及催化性能研究

以亲水硅胶Degussa A300和疏水硅胶Degussa R106作为催化剂载体，采用等体积浸渍法制备了一系列钴基催化剂。利用MS、XRD、BET、FT-IR、TPR等手段考察了载体热稳定性，催化剂表面物相结构和还原性能等物化性能。结果表明，载体表面有机基团对催化剂中Co3O4尺寸大小有影响，有机基团对载体表面羟基的取代使得金属钴与载体的作用力减弱，有利于金属团聚为较大的颗粒。费-托反应结果表明，亲水硅胶性制得的催化剂通过后处理引入甲基后，造成催化剂活性下降，C18+的选择性下降，但使烃分布集中在C5～C18，这是由于表面甲基的空间位阻作用不利于反应中的吸附过程和链增长过程。由疏水载体制备的催化剂虽然钴颗粒较大，但是由于催化剂制备过程中部分有机基团的烧结，对催化剂活性产生了较大的负面影响，使催化活性降低，重质烃选择性明显降低。     

盐酸三甲胺三氧化铬／硅胶对醇类化合物的氧化研究

报道了盐酸三甲胺三氧化铬／硅胶对醇类化合物的氧化反应。盐酸三甲胺三氧化铬／硅胶可在多种介质中氧化伯醇和仲醇成为相应的醛或酮，反应条件温和、操作简单、收率高。     

Oxidation of alcohols by TBHP in the presence of sub-stoichiometric amounts of MnO2

Commercially available activated MnO₂ has been investigated as a catalyst for the oxidation of alcohols (phenylethanol, 4-methyl- and 4-methoxybenzyl alcohol, trans-cinnamyl alcohol, cyclohexanol, menthol, perillyl alcohol and myrtenol) by TBHP/decane or TBHP/water in MeCN. The activity is highest for benzylic and allylic alcohols. Secondary alcohols yield ketones with good selectivities, while the aldehydes generated from primary alcohols are further oxidized. The process competes with the TBHP catalyzed decomposition. It thus requires the use of excess TBHP and high catalyst loadings to achieve high conversions. However, the low cost of the reagents makes this new protocol convenient for the oxidation of reactive secondary alcohols. The study also suggests that MnO₂ should be proscribed as a reagent to quench excess TBHP in oxidative processes when the synthetic target contains easily oxidizable alcohol functions and when carrying our detailed kinetic monitoring of oxidation processes.     

Oxidation with a photolabile carbonyl protecting group

A novel oxidation approach utilizing a robust photolabile carbonyl protecting group reagent (1) as the oxidizing reagent has been developed. Different from existing methods, this approach oxidizes primary alcohols to the photosensitive acetals (e.g., 3), providing another unique approach to the protected aldehydes. Thus, for the first time, oxidation and protection are achieved in one reaction. Secondary alcohols are oxidized to the corresponding ketones. Moreover, the photolabile protecting group (PPG) also oxidizes ethers and esters. The oxidation is presumably via hydride abstraction by the tritylium ion generated from 1 under acidic conditions. However, the mechanisms for primary alcohols and secondary alcohols are slightly different.     

A novel and selective oxidation of benzylic alcohols with polymer-supported periodic acid under mild aprotic conditions

A new polymeric oxidizing reagent was prepared by supporting periodic acid on poly（1,4-phenylene-2,5-pyridine dicarboxyamide）. This polymeric reagent was used for the selective oxidation of primary benzylic alcohols to the corresponding benzaldehydes in CH₃CN at reflux conditions.Excellent selectivity was observed between primary benzyl alcohols and secondary ones as well as non-benzylic alcohols in the oxidation reactions.Allylic alcohols were also converted to the corresponding aldehydes with good yields.     

氯铬酸三甲铵/氧化铝的制备及其对醇和苯偶姻类化合物的氧化

本文报道了氯铬酸三甲铵/氧化铝的制备方法及其对醇和苯偶姻类化合物的氧化反应。 该试剂制备简单、性质稳定。氧化反应条件温和、操作简单、提纯方便、收率良好。     

A new polymer-attached reagent for the oxidation of primary and secondary alcohols

A new, polymer-bound reagent system for the efficient oxidation of primary alcohols to aldehydes and secondary alcohols to ketones in the presence of a catalytic amount of 2,2,6, 6-tetramethyl-1-piperidinyloxyl (TEMPO) is described. In most cases, workup of this heavy metal-free oxidation is achieved by simple filtration followed by removal of the solvent. In selected examples this reagent was compared with the known polymer-bound permanganate and chromium(VI) reagents.     

Selective oxidation of organic compounds using pyridinium-1-sulfonate fluorochromate, C5H5NSO3H [CrO3F] ( PSFC )

Efficient selective oxidation of primary, secondary, and benzylic alcohols to the corresponding carbonyl compounds by a new chromium oxidizing reagent, pyridinium-1-sulfonate fluorochromate, C₅H₅NSO₃H [CrO₃F] (PSFC) is reported. Various cholesterol derivatives were easily converted to related oxocholesterol from allylic oxidation at lower temperature in comparison to other general oxidants. This oxidation procedure is simple and affords good yields.     

Oxidation of Alcohols with Polymeric Reagent of Poly [Vinyl (Pyridinium Fluorochromate)]

Poly [Vinyl (Pyridinium Fluorochromate)] is a new reagent for the selective oxidation of primary and secondary alcohols under mild conditions. It also oxidises aromatic and α,β - unsaturated alcohols to the corresponding aldehydes and ketones in good yield.     

Oxidation of Alcohols by Bromine on Alumina

Bromine adsorbed on neutral alumina is an effective reagent for the oxidation of secondary alcohols to ketones.     

Selenocyanation using a combined reagent of triphenylphosphine and selenocyanogen. A new and simple synthesis of alkyl selenocyanates and symmetrical alkyl diselenides from alcohols

A novel reagent Ph₃SeCN)₂, easily prepared by adding an equimolar amount of tri-phenylphosphine to selenocyanogen solution in methylene chloride and tetrahydrofuran reacts below ?60° with primary alcohols to produce directly the corresponding alkyl selenocyanates and alkyl diselenides in good yields. With secondary alcohols mixtures of selenocyanates and isoselenocyanates are obtained, while tertiary alcohols fail to react with the reagent.