Synthesis of 9-benzyl-o- and 9-benzyl-m-carboranes containing functional substituents in the benzene ring by electrophilic alkylation ofo- andm-carboranes by the correspondingR-benzyl halides

9-Benzyl-o- andm-carboranes containing NO₂, COOH, COOMe, and COPh groups in thepara-position of the benzene ring were synthesized by the Friedel—Crafts reaction.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1138–1140, June, 1995.This study was financially supported by the International Science Foundation (Grant MSE 000).     

四苯基卟啉钴催化有机化合物与二氧化碳的电羧化反应Ⅱ.

研究了α、β、γ、δ－四苯基卟啉钴（ＣｏＴＰＰ）存在下苄基氯、苯乙酮、二苯甲酮和萘等与ＣＯ＿２的电羧化反应，与无催化剂体系相比，ＣｏＴＰＰ可使这些有机化合物与ＣＯ＿２电羧化反应的过电位降低约８００～１０００ｍＶ，对反应有较高的催化活性．用ＵＶ，ＩＲ和ＧＣ－ＭＳ确认了电羧化产物，并探讨了ＣｏＴＰＰ催化反应机理．     

Heterogeneous and homogeneous reduction of benzyl phenyl ether

By analyzing the kinetics of heterogeneous (electrode) and homogeneous reduction for benzyl phenyl ether it was found that toluene and phenol are formed via the transfer of two electrons and the breaking of the PhO-Bz bond. It was shown that electron transfer constitutes the slow stage in heterogeneous and homogeneous reduction. The homogeneous transfer coefficient was approximately 0.5, which represents a significant difference from the heterogeneous value.A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan's Scientific Center, Russian Academy of Sciences, 420083 Kazan'. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 8, pp. 1760–1765, August, 1992.     

A new strategy for the stereospecific syntheses of C-furanosides

This reaction provided an efficient method to synthesize C-furanoside derivatives in high yields and stereospecificity under mild conditions.The cyclization mechanism regarding benzyl group as a leaving group was discussed and their stereochemistry was deduced by 1H-1H NOESY data.     

Dielectric properties of binary mixtures of n-methylbenzenesulfonamide

The dielectric permittivities of binary mixtures of N-methylbenzenesul-fonamide (N-MBS) with benzyl alcohol, 1,2-dichloroethane, 1,4-dioxane and hexamethylphosphortriamide were measured as a function of mole fraction over the whole composition range at 30 and 50°C. The excess dielectric permittivities and the excess molar polarizations were also calculated. The excess dielectric permittivities ^E and excess molar polarizations P_E were found to be negative for N-methylbenzene-sulfonamide mixtures with benzyl alcohol and 1,4-dioxane, ^E values were positive and P^E values negative for mixtures with 1,2-dichloroethane, and ^E and P^E values were clearly positive for mixtures with hexamethylphosphortriamide. The results are discussed in terms of the strength of the dipolar and hydrogen-bonding interactions between the molecules in various binary mixtures.     

Raney-Ni催化剂的磁固载及其应用

 Raney-Ni催化剂由于价格便宜且催化活性高,在加氢反应中有广泛的应用,但其催化活性会随使用次数的增加而迅速下降. 通过对Raney-Ni催化剂的SEM照片及粒度分布进行分析可知,在不饱和乙内酰脲加氢反应过程中,催化剂活性下降的主要原因是催化剂的粉化流失和活性位点镍微晶的熔合. 在反应体系中添加磁性材料KF-610后,减少了批次反应过程中催化剂的流失及活性的快速下降,可实现催化剂的回收利用及活性维持. 经20批次亚苄基乙内酰脲、对羟基亚苄基乙内酰脲和吲哚亚甲基乙内酰脲加氢反应,不饱和乙内酰脲的转化率均在90%以上,催化剂相对于底物的用量可大幅度降低.     

Oxoperoxo tungsten(VI) complex immobilized on Schiff base-modified Fe3O4 magnetic nanoparticles as a heterogeneous catalyst for oxidation of alcohols with hydrogen peroxide

Oxoperoxo tungsten(VI) complex immobilized on Schiff base-modified Fe₃O₄ super paramagnetic nanoparticles were synthesized and appropriately characterized using FT-IR, XRD, SEM, TEM, EDX, BET, and VSM analysis. The synthesized nanoparticles efficiently catalyzed oxidation of benzylic alcohols with H₂O₂ as oxidant in high yields, with high to excellent selectivity. The catalyst can be recovered using an external magnetic field and recycled for subsequent oxidation reactions without any appreciable loss of efficiency. The simple preparation, high activity, excellent selectivity, and simple recoverability of the catalyst are advantageous.