磷改性β沸石催化剂上催化裂化轻汽油的醚化

在小型固定床反应装置上,考察了负载磷的β沸石催化剂的制备条件对其催化性能的影响以及醚化反应温度、压力、醇烯摩尔比、LHSV对醚化反应的影响。实验结果表明,浸渍磷的质量分数为2%的Hβ催化剂具有较好的醚化活性。在最佳反应条件(温度70 ℃,压力0.8 MPa,LHSV 1.0 h-1,醇烯摩尔比1.0)下,该催化剂的叔碳烯烃的总转化率可达到56.91%。负载磷后的催化剂具有活性好、选择性高、不易失活等优点。反应性能均优于Hβ催化剂。     

杂双子表面活性剂的合成

α-溴代十四酸甲酯与对甲苯酚经W illiam son醚化、NBS溴化、季铵化、皂化得3个头基分别是羧酸盐和季铵盐的杂双子表面活性剂,其结构经1HNMR,IR和元素分析确认。     

医用纱布醚化处理后的结构与性能研究

研究了经低度醚化和交联处理的医用纱布纤维的结构和性能。结果表明,随取代度（ＤＳ）的增大,纤维结晶度下降,润胀能力提高,与生理液接触时,纤维端部的毛刺和尖锐边缘消失,并变得柔软,该纱布的水吸附保持值（ＷＲＶ）、等渗盐水吸附保持值（ＳＲＶ）和新鲜血浆吸附保持值（ＢＲＶ）分别为未处理纱布的８．６倍、２．８倍和１．７倍,用ＣｕＳＯ４进行离子交换处理后的ＢＲＶ为未处理纱布的２．８倍。     

MWCNTs-NH2/环氧树脂纳米复合材料压缩性能影响机理

采用1,2-环氧环己烷4,5-二甲酸二缩水甘油酯（TDE-85)、对氨基苯酚环氧树脂（AFG-90）及其混合树脂,以二氨基二苯砜（DDS）为固化剂,添加氨基化多壁碳纳米管（MWCNTs-NH₂）制备了纳米复合材料。应用非等温差示扫描量热（DSC）,红外光谱（FT-IR）和力学性能测试等方法,分析了添加MWCNTs-NH₂前后,树脂体系固化反应、醚化反应与压缩性能的变化。研究结果表明,碳纳米管/环氧树脂复合材料的压缩性能与固化反应后期羟基和环氧基团之间的醚化作用有密切关系。MWCNTs-NH₂的加入阻碍了TDE-85/DDS体系固化反应后期的醚化作用,与纯树脂体系相比反应热降低了50 J/g,红外光谱中脂肪族醚键与苯环吸收峰面积比值降低了7.7%,复合材料压缩强度降低了3.2%。与之相反的是,MWCNTs-NH₂的加入促进了AFG-90/DDS体系固化反应后期的醚化作用,与纯树脂体系相比,反应热提高了80J/g,红外光谱中脂肪族醚键与苯环的吸收峰面积比值提高了13.8%,复合材料压缩强度提高了17.4%。     

杯[4]芳烃醚衍生物的合成研究（I）

以对叔丁基苯酚和甲醛为起始原料，通过缩合、两步取代反应合成了对叔丁基杯[4]芳烃的四醚化衍生物，并对反应条件进行了较为详细的研究。     

Total Synthesis and Structure Revision of Halioxepine

The first total synthesis of halioxepine is accomplished using a 1,4-addition for constructing the quaternary center at C10 and a halo etherification for the generation of the tertiary ether at C7. The correct structure of halioxepine was determined by assembling different enantiomeric building blocks and by changing the relative configuration between C10 and C15.     

The Synthesis of trans‐Flavan‐3‐ol Gallates by Regioselective Oxidative Etherification and Their Cytotoxicity Mediated by 67 LR

We report on a chiral pool approach for the synthesis of trans‐flavan‐3‐ol gallates from epichlorohydrin. The trans‐flavan‐3‐ol gallates were prepared by the cycloetherification of the phenol at the C2 benzylic position of 2‐acylozyl‐1,3‐diarylpropane during regioselective C?H oxidation. The 1,3‐diarylpropanes were prepared starting from epichlorohydrin by epoxide opening with A and B ring precursors, followed by acylation of the resultant alcohol with galloyl chloride. The availability of both the enantiomers of epichlorohydrin allowed the preparation of the corresponding enantiomer using the same procedure. The cytotoxicity of the compounds against U266 cells was tested, in which 5‐deoxy‐7,3′‐O‐dimethyl gallocatechin gallate exhibited cytotoxicity that was more than ten times stronger than natural (?)‐EGCG. In addition, the absolute configuration of the derivatives did not critically affect the biological activity.