温控相转移配体及催化(Ⅴ)——单,双-对聚氧乙烯基三苯基膦的合成及其催化性能研究

近年来,水／有机两相催化已成为均相催化多相化研究的主流［１］．其中,新型水溶性膦配体的合成和两相催化新体系的设计尤为引人关注［２］．最近我们发现［３］,聚醚型水溶性膦－铑催化剂在高温下可溶入有机相对反应进行催化,而在冷却后又重返水相和产物分离．本文通...     

新一代高活性后过渡金属烯烃聚合催化剂

介绍了近几年发展起来的新一代后期过渡金属(Fe,Co,Ni,Pd)烯烃聚合催化剂,对催化剂的结构、性能及催化烯烃聚合进行了阐述。     

Recent Advances in Organic Reactions Catalyzed by Lanthanide(III) Complexes

Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｈｅｎａｍｅ“ｒａｒｅｅａｒｔｈ”ａｐｐｌｉｅｓｔｏｔｈｅｌａｎｔｈａｎｉｄｅｓ ,ｙｔｔｒｉｕｍａｎｄｓｃａｎｄｉｕｍ .Ｔｈｅ 15ｅｌｅｍｅｎｔｓｏｆｌａｎｔｈａｎｉｄｅｆｒｏｍｌａｎｔｈａｎｕｍｔｏｌｕｔｅｔｉｕｍｃｏｎｓｔｉｔｕｔｅａｕｎｉｑｕｅｆａｍｉｌｙｏｆｃｌｏｓｅｌｙｒｅｌａｔｅｄｅｌｅｍｅｎｔｓ (ｔｈｅｄｉｆｆｅｒｅｎｃｅｌｙｉｎｇｉｎｔｈｅｎｕｍ ｂｅｒｏｆ 4ｆｅｌｅｔｒｏｎｓ)ｆｒｏｍｗｈｉｃｈｒｅｇｅｎｔｓｏｒｃａｔａｌｙｓｔｓｗｉｔｈ“ｔｕｎａｂ…     

One-Pot Syntheses of 3,4-Dihydropyrimidine-2(1H)-thiones Catalyzed by La(OTf)_3

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓ ,ｄｉｈｙｄｒｏｐｙｒｉｍｉｄｉｎｅｔｈｉｏｎｅｄｅｒｉｖａｔｉｖｅｓｈａｖｅａｔｔｒａｃｔｅｄｃｏｎｓｉｄｅｒａｂｌｅｉｎｔｅｒｅｓｔｄｕｅｔｏｔｈｅｉｒｐｒｏｍｉｓｉｎｇａｃｔｉｖｉｔｉｅｓａｓａｎｔｉｃａｒｃｉｎｏｇｅｎｉｃａｇｅｎｔｓ ,1ｃａｒｄｉｏｖａｓｃｕｌａｒａ ｇｅｎｔｓ2 ａｎｄｃａｌｃｉｕｍｃｈａｎｎｅｌｂｌｏｃｋｅｒｓ .3Ｉｎａｄｄｉｔｉｏｎ ,ｓｏｍｅｄｅｒｉｖａｔｉｖｅｓｏｆｄｉｈｙｄｒｏｐｙｒｉｍｉｄｉｎｅｔｈｉｏｎｅｗｅｒ…     

Microstructure and properties of plastic deformed martensite induced by laser shock processing

Firstly, 45# steel was quenched by the NEL-2500A rapidly axial flow CO2 laser. The experimental parameters were the laser power of 750 W, the laser beam diameter of 4 mm, the scanning velocity of 7 mm/s. The thickness of coating layer was 0.1 mm and the width was 8 mm. Secondly, the martensite induced by laser quench was shocked by Nd:YAG laser. The parameters of laser shock processing were the wavelength of 1.06 μm, the pulse duration of 23 ns, and the output energy of 16-20 J. The laser was focused on a spot of φ7 mm. K9 optical glass was used as confinement. The sample was coated with black paint 86-1 (the thickness is about 0.025 mm). By testing and analysis of samples which were treated by laser quench and laser quench+shock with transmission electron microscope (TEM), it was discovered that the surface layer of martensite was deformed plastically by laser shock processing. In the secondary hardened zones, there were a lot of slender secondary twin crystal martensites, dislocation tangles, and cel     

新型双锂盐络合物的合成及其单晶结构的测定

报道了一种新的双锂盐络合物的合成及其X衍射单晶结构，该络合物含有2个 Li原子、一个（i-Pr2C6H3)2-dad配体及2个DME分子[triclinic,P-1,α=1.3478(4) ,b=1.5158(3),c=1.0730(3)nm,α=100.668(3)°,β=113.416(3)°，γ=97.128(3) °,Ⅴ=1.790(1)nm^3,Dc=1.06g/cm^3,Z=2,R/Rω=0.058/0.057]。     

Recent Advances in Organic Reactions Catalyzed by Lanthanide（Ⅲ） Complexes

Lanthanide compounds have been attracting much attention in organic synthesis.Chiral Ln-substituted BINOL have been widely studied in several asymmetric organic reactions.LnCl3 and Ln(OTf)3 have been expected to serve as Lewis acide and have been applied to many important synthetic reactions in a one-pot manner,Ln(O-i-Pr)3 exhibits some basic characters,which also can be utilized in some special organic transformation.This article deals with some lanthanides(Ⅲ）complexes promoted organic reactios,which we have recently developed.