Sodium Butylated Hydroxytoluene (NaBHT) as a New and Efficient Hydride Source for Pd-Catalysed Reduction Reactions

NaBHT (sodium butylated hydroxytoluene), a hindered and soluble base for the efficient arylation of various base-sensitive amines and (hetero)aryl halides has been found to have an unanticipated role as a hydride donor to reduce (hetero)aryl halides and allylic acetates. Mechanistic studies have uncovered that NaBHT, but not BHT, can deliver multiple hydrides through oxidation of the benzylic methyl group in NaBHT to the aldehyde. Further, performing the reduction with NaBHT-d₂₀ has revealed that the redox-active benzylic position is not the only hydride donor site from NaBHT with one hydride in three coming, presumably, from the tert-butyl groups. The reduction works well under mild conditions and, incredibly, only consumes 20 percent of the NaBHT in the process; the remaining 80 percent can be readily recovered in pure form and reused. This, combined with the low cost of the material in ton-scale quantity, makes it practical and attractive for wider use in industry at scale.     

胶束电动毛细管色谱法测定地层水中的单环芳烃

二甲苯;环境分析;胶束电动毛细管色谱法测定地层水中的单环芳烃     

Benzoylation of Toluene over Al-promoted SO_4~(2-)/M_xO_y(M=Zr,Ti,Fe) Catalysts

ＴｈｅｂｅｎｚｏｙｌａｔｉｏｎｏｆｔｏｌｕｅｎｅｗｉｔｈｂｅｎｚｏｙｌｃｈｌｏｒｉｄｅｉｓａｎｉｍｐｏｒｔａｎｔａｃｉｄｃａｔａｌｙｔｉｃＦｒｉｅｄａｌＣｒａｆｔｓｒｅａｃｔｉｏｎ．Ｌｅｗｉｓａｃｉｄｓ,ｓｕｃｈａｓｄｅｈｙｄｒａｔｅｄＡｌＣｌ３ａｎ...     

稀土固体超强酸SO4^2-／TiO2-La^3＋催化硝化甲苯的研究

研究了以固体超强酸SO24-/TiO2-La3 作为催化剂,浓硝酸和甲苯为原料合成硝基甲苯,并考察了影响反应的因素。结果表明,催化剂用浓度为1.0 mol.L-1硫酸浸泡3小时,反应催化剂用量为硝酸质量的10%,反应时间为3小时,反应温度为55℃是最适宜的反应条件,甲苯转化率达90.14%,邻对比达0.89。     

气相色谱法测定间甲基二苯醚中的氯苯和间甲酚含量

用气相色谱法测定了间甲基二苯醚中的微量氯苯和间甲酚。实验条件：玻璃柱内填４％ＳＥ－３０＋０．２％ＰＥＧ２０Ｍ／ＣｈｒｏｍｏｓｏｒｂＷＨＰ（６０～８０目）,柱温１５０℃,载气（Ｎ２）流速３５ｍＬ／ｍｉｎ,ＦＩＤ检测,以邻甲酚为内标定量。方法具有灵敏（０．１ｎｇ）、可靠、快速（＜２０ｍｉｎ）等特点。     

Effect of ZSM-5 zeolite morphology on the catalytic performance of the alkylation of toluene with methanol

A series of ZSM-5 zeolites, with the morphologies of sphere, sphere with cubic particles on the surface, and cubic particles, were synthesized by hydrothermal method using n-butylamine as the template, assisted by the addition of NaCl and crystal seed. X-ray diffraction(XRD),scanning electron microscope(SEM), X-ray fluorescence(XRF) and temperature-programmed desorption of ammonia(NH3-TPD) were used to characterize these samples. The samples were tested with toluene methylation reaction. The modified sample composed of spherical particles with 3 μm crystal particles on the surface had a para-xylene selectivity of 95% and maintained 79% of the initial conversion after running the reaction for 50 h. This modified sample showed the best stability among the tested three modified samples.     

负载CuO的Ti~(3+)/TiO_2催化剂制备及其光催化甲苯降解性能

通过在锐钛矿TiO_2载体表面上负载Cu-BTC(BTC,1,3,5-苯甲酸)前驱体,还原处理制备光催化剂CuO-Ti~(3+)/TiO_2(Cu-TiMB),对其在可见光条件下气相甲苯净化催化性能进行了研究。结果表明,该改良方法制备的CuO-Ti~(3+)/TiO_2(CuTiM B)催化剂的活性是浸渍法所得催化剂CuO-TiO_2(Cu-TiD)的2.68倍。CuO-Ti~(3+)/TiO_2(Cu-TiMB)具有更大的比表面积(147 m2/g)和较小的颗粒粒径(0.45μm),呈现多孔状,CuO的分散度较高;催化剂表面Ti~(3+)提供了大量的氧缺位,在400-800 nm波段的光响应能力显著增强。CuO-Ti~(3+)/TiO_2(Cu-TiMB)催化剂中Cu~(2+)、Cu~+与Ti~(3+)形成的异质结构进一步增多了氧缺位数量,延缓e--h+的复合时间;氧缺陷增强了捕获吸附氧能力,通过金属氧化物价态变化增强化学吸附能力,提高了光催化性能。     

Dynamics of Aromatic Molecules Clathrated in Crystalline Syndiotactic Polystyrene: A Solid State 2H NMR Investigation of the Host/Guest Complexes

Syndiotactic polystyrene clathrates hosting benzene‐d₆ or toluene‐d₈ molecules in the cavities of the δ crystalline form have been prepared and investigated by means of solid state ²H NMR spectroscopy. Benzene‐d₆ molecules were found to be involved in a fast rotation about the C₆ symmetry axis whereas the toluene‐d₈ molecules exhibit a fast rotation of the methyl group about the symmetry axis passing through the C₁ and C₄ carbon atoms.     

色谱法同时测定石油甲苯馏程和纯度

This paper describes the conditions of GC analysis of petroleum toluene and the method of data process-ing.This method can simultaneously determine boiling range and purity of petroleum toluene,and its opera-tion is simple practical and suitable for computer operation. The data obtained proved that this method completely satisfies the required precision of National Stan-dard Methods.