Page 125 - 《精细化工》2021年第8期
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第 8 期               薄晓帆,等:  溶胶-凝胶法制介孔 Pd/m-TiO 2 催化连续流 Suzuki 偶联反应                      ·1619·


            唑双三氟甲磺酰亚胺盐。在连续流工艺中使用 Pd/C                              12184-12188.
            催化剂时,在 6.8 min 内可获得 89%的反应收率(序                     [7]   BORKOWSKI T, TRZECIAK A  M, BUKOWSKI W,  et al.
                                                                   Palladium(0) nanoparticles  formed in situ  in the Suzuki-Miyaura
            号 6),而自制 0.7% Pd/m-TiO 2 催化剂在相同时间内                     reaction: The effect of a palladium( Ⅱ ) precursor[J]. Applied
            可获得 99%的反应收率(序号 8)。                                    Catalysis A General, 2010, 378(1): 83-89.
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            3   结论                                                 immobilized in the nanocages of SBA-16: An efficient and recyclable
                                                                   catalyst for Suzuki coupling reaction[J]. Microporous & Mesoporous
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                 通过溶胶-凝胶法制备了具有有序介孔结构的                          [9]   ZIM D, MONTERIO A L. PdCl 2(SEt 2) 2 and Pd(OAc) 2: Simple and
            Pd/m-TiO 2 催化剂,Pd 负载量为 0.1%~1.0%,介孔                    efficient catalyst precursors for the Suzuki cross-coupling reaction[J].
                                                                   Tetrahedron Letters, 2001, 41(43): 8199-8202.
            孔径在 8.7~10.2 nm 之间,Pd 粒子均匀分布在载体                    [10]  DAS P, SHARMA D, SHIL A K,  et al. Solid-supported  palladium
            上,粒子尺寸为 11.3~13.3 nm,制备过程中加入的                          nano and microparticles: An efficient heterogeneous catalyst for
                                                                   ligand-free Suzuki-Miyaura cross coupling reaction[J]. Tetrahedron
            PVP 有效控制了 Pd 粒子尺寸,避免了以往负载型
                                                                   Letters, 2011, 52(11): 1176-1178.
            Pd 催化剂中经常出现的 Pd 团聚现象。在微填充床                         [11]  LI R (李瑞), BAI X F (白雪峰). Research progress in  palladium
            反应器中进行了连续流 Pd/m-TiO 2 催化溴苯与苯硼                          ligand catalysts on Suzuki coupling  reactions[J]. Chemistry and
                                                                   Adhesion (化学与粘合), 2011, 33(4): 55-59.
            酸的 Suzuki 偶联反应,确定了最优工艺条件:                          [12]  WU L (吴莉), LONG Y (龙雨), MA J T (马建泰), et al. Research
            DMF/H 2 O〔V(DMF)∶V(H 2 O)=1∶1〕为溶剂,碱为                   progress of catalytic system for Suzuki reaction[J]. Journal of
                                                                   Molecular Catalysts (分子催化), 2019, 33(3): 263-273.
            K 3 PO 4 ,流速为 0.20 mL/min,溴苯、苯硼酸和 K 3 PO 4
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            的浓度分别为 0.10、0.12 和 0.15 mol/L,Pd 负载量                   conformation of polyelectrolytes in mesoporous silica  spheres[J].
            为 0.7%,反应温度 80  ℃,6.8 min 内反应收率达                       Langmuir, 2008, 24(8): 4224-4230.
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            99%。不同离去基团取代芳烃在该连续流工艺条件                                Catalytic benzene alkylation over mesoporous zeolite single crystals:
                                                                   Improving activity and selectivity with a new family  of porous
            下反应收率均达到了 99%。此外,0.7% Pd/m-TiO 2
            催化剂使用 5 次后,反应收率仍达 97%,所制备的                             materials[J]. Journal of the American Chemical Society, 2003,
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            催化剂具有良好的催化活性和重复使用性能。该连                             [15]  HAN  Y J,  KIM J  M, STUCKY  G D. Preparation of noble metal
            续流合成工艺具有以下优点:(1)易于实现进料自                                nanowires using hexagonal mesoporous silica SBA-15[J]. Chemistry
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            动化、反应全程连续化;(2)反应效率明显提升,                            [16]  RIVALLAN M, SEGUIN E, THOMAS S, et al. Platinum sintering
            反应时间可由间歇法工艺中的 1 h 缩短至 6.8 min;                         on H-ZSM-5 followed by chemometrics of CO adsorption and 2D
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            的微填充床反应器实现整体式重复利用,避免了催                             [17]  PLUTSCHACK M B, PIEBER B,  GILMORE K,  et al. The
            化剂的过滤和再填充等操作,有效减少了常规间歇                                 hitchhiker's guide to flow chemistry[J].  Chemical  Reviews, 2017,
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            法产物分离和催化剂再生循环中引起的催化剂质量                             [18]  MORSE P D, BEINGESSNER R L, JAMISON T F.  Enhanced
            损失和活性降低等问题。                                            reaction efficiency in continuous flow[J]. Israel Journal of Chemistry,
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