Ethylene/1-hexene copolymerization by salicylaldiminato vanadium(III) complexes activated with diethylaluminum chloride

Mono salicylaldiminato vanadium（Ⅲ） complexes（1a-1f）[RN = CH（ArO）]VCl₂（THF）₂（Ar = C₆H₄（1a-1e）,R = Ph,1a;R = p-CF₃Ph,1b;R = 2,6-Me₂Ph,1c;R = 2,6-iPr₂Ph,1d;R = cyclohexyl,1e;Ar = C₆H₂tBu₂（2,4）,R = 2,6-iPr₂Ph, 1f） and bis（salicylaldiminato） vanadium（Ⅲ） complexes（2a-2f）[RN = CH（ArO）]₂VCl（THF）_x（Ar = C₆H₄（2a-2e）,x = 1 （2a-2e）,R = Ph,2a;R =p-CF₃Ph,2b;R = 2,6-Me₂Ph,2c;R = 2,6-iPr₂Ph,2d;R = cyclohexyl,2e;Ar = C₆H₂tBu₂（2,4）,R = 2,6-iPr₂Ph,x = 0,2f） have been evaluated as the active catalysts for ethylene/1-hexene copolymerization in the presence of Et₂AlCl.The ligand substitution pattern and the catalyst structure model significantly influenced the polymerization behaviors such as the catalytic activity,the molecular weight and molecular weight distribution of the copolymers etc.The highest catalytic activity of 8.82 kg PE/（mmol_V·h） was observed for vanadium catalyst 2d with two 2,6-diisopropylphenyl substituted salicylaldiminato ligands.The copolymer with the highest molecular weight was obtained by using mono salicylaldiminato vanadium catalyst 1f having ligands with tert-butyl at the ortho and para of the aryloxy moiety.     

Synthesis and Characterization of Organoboryl Germanium (Ⅱ) Oxides Containing Ge-O-B and Ge-O-B-O-Ge Cores

Organoboryl germanium(Ⅱ) oxides were synthesized from the 1,4-addition reaction of L'Ge(L'=HC[C(CH_2)N(Ar)]C(Me)N(Ar),Ar=2,6-iPr_2C_6H_3) with selected monosubstituted arylboronic acids RB(OH)_2(R=2,6-Me_2C_6H_3,2,4,6-Me_3C_6H_2,1-Naph) at the molar ratios of 1:1 and 2:1.The mononuclear products RB(OH)OGeL(L=CH[C(Me)N(Ar)]_2,Ar=2,6-iPr_2C_6H_3;R=2,6-Me_2C_6H_3(1),2,4,6-Me_3C_6H_2(2),1-Naph(3)) containing the Ge-O-B core were obtained smoothly through the 1:1 reaction.However,the reaction of L'Ge with 2,6-Me_2C_6H_3B(OH)_2 in a 2:1 ratio gave only the mononuclear product(1) instead of the expected binuclear one.What's more,a new borate compound [(2,6-Me_2C_6H_3)_4B_5O_6]~-[H:C]~+(4)(:C=C[N(iPr)C(Me)]_2) was concomitantly formed when the in situ prepared L'Ge was used as the precursor.In contrast,the use of 2,4,6-Me_3C_6H_2B(OH)_2 or1-NaphB(OH)_2 as the organoboryl source in the similar reaction led to the formation and isolation of the binuclear products RB(OGeL)2(R=2,4,6-Me_3C_6H_2(5),1-Naph(6)) containing the Ge-O-B-O-Ge core in a straight way.Compounds 1~6 were determined by single-crystal X-ray diffraction analysis.     

二(β-二亚胺基)二价稀土配合物催化醛/酮与亚磷酸二乙酯的氢磷化反应

研究了一系列二(β-二亚胺基)二价稀土配合物[Eu(L~(2,6-ipr2))_2·CH_3C_6H_5,L~(2,6-ipr2)=[N(2,6-~(i)Pr_2C_6H_3)C(Me)]_2CH~-(1);Eu(L~(2,6-Me2))_2(THF),L~(2,6-Me2)=[N(2,6-Me_2C_6H_3)C(Me)]_2CH~-(2);Eu(L~(2,4,6-Me3))_2(THF),L~(2,4,6-Me3)=[N(2,4,6-Me_3C_6H_2)-C(Me)]_2CH~-(3);Eu(L~(2,6-ipr2)Ph)2,L~(2,6-ipr2)Ph=[(2,6-iPr_2C_6H3_)NC(Me)CHC(Me)N(C_6H_5)]–(4);Sm(L~(2,6-ipr2))_2·CH_3C_6H_5(5);Yb(L~(2,6-ipr2)Ph)2(6);Yb(L~(2-Me))2(THF),L~(2-Me)=[N(2-Me C6H4)C(Me)]2CH–(7)]对醛/酮与亚磷酸二乙酯的氢磷化反应的催化行为.发现所有配合物都可以在温和条件下,高效地催化芳醛以及杂环芳醛与亚磷酸二乙酯的氢磷化反应,在催化剂用量为0.08 mol%,25℃,无溶剂条件下反应5 min,α-羟基膦酸酯的收率可以达到90%~99%.催化活性有赖于β-二亚胺基的结构,其活性顺序为L~(2,6-Me2)L~(2,4,6-Me3)L~(2,6-ipr2)≈L~(2,6-ipr2)Ph.该催化体系具有优秀的醛底物适应能力.这类二价稀土配合物也可以有效地催化未活化的酮与亚磷酸二乙酯的反应,并显示良好的底物适应能力.     

Synthesis and Structural Characterization of N,N-disubstituted Acylguanidines

A series of five N,N-disubstituted acylguanidines R~1C(O)N=C[N(H)R~2]NR_2~3(R~1=Mes or Ph; R~2=Ar??or Ar?; R~3=Cy, Bn, iPr, or Et)(Mes=2,4,6-Me_3C_6H_2, Ar??=2,6-iPr_2C_6H_3, Ar?=2,6-Me_2C_6H_3) was synthesized from the reactions of parent acylthioureas with respective secondary amines. According to structutral characterization by single-crystal X-ray diffraction, the rough reduction of the steric hindrance of R substitutents of R~1 C(O)N=C[N(H)R~2]NR_2~3(also abbreviated as R~1-R~2-R~3 for comparison purposes) led to the slight enlongation of N(1)–C(1) bond lengthes and small decrease of N(1)–C(1)–N(3) bond angles from Mes–Ar??–Cy(1) to Ph–Ar??–Bn(2), Ph–Ar??–iPr(3) and Ph–Ar?–Cy(4). At the same time, the N(1)–H(1)···O(1) intramolecular hydrogen bonds were observed in these cases. When R~3=Et, an interesting compound Ph-Ar?-Et(5) was obtained with the formation of intermolecular hydrogen bonds instead. 1 belongs to the monoclinic system, space group P2_(1/n) with a=9.6488(3), b=28.5318(8), c=11.9155(3) ?, b=91.439(2)o, V=3279.27(16) ?~3, and Z=4. 2 belongs to the triclinic system, space group P1 with a=9.6759(7), b=10.8613(8), c=15.7642(12) ?, a=70.429(3), b=79.257(4), g=69.052(4)o, V=1453.63(19) ?~3 and Z=2. 3 belongs to the monoclinic system, space group P2_(1/c) with a=11.1393(4), b=13.0643(4), c=17.6600(6) ?, b=101.866(2)o, V=2515.09(15) ?~3 and Z=4. 4 belongs to the monoclinic system, space group C2/c with a=17.8466(3), b=13.6126(2), c=21.6710(4) ?, b=90.7310(10)o, V=4992.72(14) ?~3 and Z=8. 5 is of orthorhombic system, space group P2_12_12_1 with a=10.5555(2), b=11.8913(2), c=14.9558(4) ?, V=1877.23(5) ?~3 and Z=4.     

Syntheses of(C_8H_8)Ln(C_9H_7)·(THF)_2(Ln=Pr,Nd)and crystal structure of(C_8H_8)Pr(C_9H_7)·(THF)_2

This paper reports two lanthanide complexes of formula (C_9H_7)Ln(C_8H_8)·(THF)_2 whereLn is Pr or Nd,C_9H_7 is indenyl,and C_8H_8 is cyclooctatetraene (COT).The complexes were preparedby the reaction of LnCl_3 with K(C_9H_7) and K_2(C_8H_8) in THF.(C_9H_7)Pr(C_8H_8)·(THF)_2 crystallizes inTHF at - 15℃ in the monoclinic space group P2_1:with unit cell dimensions a=8.446(0),b=10.083(2),c=13.407(3),β=105.48(1)°,V=1100.43(35)~3,Dc=1.52g/cm~3 and Z=2.The final R valueis 0.033,R_w value is 0.030,respectively.In (C_9H_7)Pr(C_8H_8)·(THF)_2 a five-membered ring centroid ofC_9H_7,the C_8H_8 ring centroid and the two oxygen atoms from the two THF molecules form a distortedtetrahedral geometry around the metal.     

过渡金属卡宾配合物——Ⅶ.四羰基[乙氧基(芳基)卡宾]铁配合物的方便合成法

五羰基铁,Fe(CO)_5(1),与芳基锂(ArLi)在乙醚中于低温下反应,所生成的酰羰基锂中间体在水溶液中于0℃用Et_3OBF_4烷基化,制得六个标题配合物(C0)_4FeC(OC_2H_5)Ar(Ar:C_6H_5,2;o-CH_3C_6H_4,3;p-CH_3C_6H_4,4;p-CH_3OC_6H_4,5;C_6Cl_5,6;p-CF_3C_6H_4,7).当用p-CF_3C_6H_4Li作为亲核试剂与1反应时,除生成7外,还获得副产物对三氟甲基苯丙酮,p-CF_3C_6H_4COC_2H_5(8).     

Efficient Addition Polymerization of Norbornene with Polar Norbornene Derivatives by Neutral Nickel(Ⅱ) Catalysts

A series of nickel complexes {4 a: [(2,6-iPr_2C_6H_3)N=CHC_(16)H_(12)O]Ni(Me)(Py), 4b: [(2,6-iPr_2C_6H_2OCH_3)N=CHC_(16)H_(12)O]-Ni(Me)(Py), 4 c: [(2,6-iPr_2C_6H_2Cl)N=CHC_(16)H_(12)O]Ni(Me)(Py), and 4d: [(2,6-iPr2C6H2CF3)N=CHC_(16)H_(12)O]Ni(Me)(Py)} based on β-ketiminato ligands bearing various electron-donating or electron-withdrawing substituents on the para-position of the aniline group were synthesized and unambiguously characterized. The X-ray crystallographic analysis showed that complexes 4 b and 4 d adopted a nearsquare-planar geometry, and the anilines bearing a para-OMe or ―CF_3 group were found to situate on the axial position of the metal center. All complexes exhibited high activities up to 1.25 × 10~7–1.35 × 10~7 g PNB·mol_(Ni)~(–1)·h~(–1) toward norbornene(NBE) addition polymerization(conversion 91.2% in 2 min) under low loading of B(C_6F_5)_3(B/Ni = 3) at 30 °C, affording polymers with high molecular weight up to 2.54 × 10~6–3.18 × 10~6. Different levels of decrease in catalytic activities could be observed for all catalysts as the reaction temperature increased; 4 d bearing a strong electron-withdrawing ―CF_3 group showed the highest activity at 70 °C, while others exhibited notable decrease in catalytic activity with the raise in reaction temperature. Complexes 4 a–4 d showed remarkable tolerance to polar groups and could efficiently promote the copolymerization of NBE with its polar derivatives, including NBE bearing small acetate and hydroxyl group, as well as bulky oligomers, yielding copolymers with high functional NBE incorporations. Novel NBE copolymers with high functional comonomer incorporations and improved solubility were obtained in high yields.     

THE BEHAVIOR OF HOMOGENEOUS IRON-BASED CATALYSTS BEARING PYRIDINE DIIMINE LIGANDS FOR ETHYLENE POLYMERIZATION*

The polymerization of ethylene by two iron-based catalysts, {[2,6-ArN=C(Me)_2C_5H_3N]FeCl_2} (Ar=2,6-C_6H_3-Me_21; 2,6-C_6Hv3 (i-Pr)v2 Ⅱ) has been investigated. Catalyst Ⅱ produces higher molecular weight polyethylene (PE) and broadenedpolydispersities relative to catalyst Ⅰ under analogous conditions and all polymers are linear. The kinetic profiles with ironcatalysts showed a smooth pattern during both rate build-up and rate lowering, which are different from the metallocenecatalysts. The polymerization activity increases with Al/Fe value and an optimum temperature range at 40～45℃ was observed. The molecular weight of PE decreases with the increase of Al/Fe ratio and rise of polymerization temperature.     

三齿β-酮亚胺钒(Ⅲ)配合物的合成及其催化乙烯(共)聚合行为研究

合成了6种三齿β-酮亚胺钒(Ⅲ)配合物{[R)X(C_6H_4)N=CH(C_6H_5)NC_(10)H_7O]VCl_2(THF):2a,R=CH_3,X=S;2b,R=CF_3,X=S;2c,R=Ph,X=S;2d,R=~tBu,X=S;2e,R=Ph_2,X=P;2f,R=Ph,X=O},并对其结构进行了表征和证明.2a～2f在催化乙烯均聚及其与环烯烃共聚时表现出了较高的催化活性和较为优异的稳定性,所得聚合物的分子量均呈单峰分布.在催化乙烯与降冰片烯(NBE)共聚以及乙烯与外型-1,4,4a,9,9a,10-六氢-9,10(1′,2′)-桥苯亚基-1,4-桥亚甲基蒽(HBM)共聚时,部分催化剂表现出了"正共单体效应".催化所得乙烯/NBE共聚物的分子量为43.1～66.4 kg/mol,NBE单元含量为30.9 mol%～42.1mol%,玻璃化转变温度为84～105°C;乙烯/HBM共聚物的分子量为90.2～138 kg/mol,HBM单元含量为14.7 mol%～25.0 mol%,玻璃化转变温度为173～188°C.     

Synthesis and Crystal Structure of [（ArO）2Sm（OPPh3）（μ—OH）]2（ArO=2,6—tBu—4—Me—C6H2O）

1 INTRODUCTION In recent years, the syntheses, structures and reactivities of aryloxo lanthanide complexes have attracted a great deal of attention due to their various applications as homogeneous catalysts for organic reactions and precursors for organolan- thanide syntheses[1]. However, the reactivity of divalent lanthanide aryloxides has seldom been studied[2]. We have previously reported that (ArO)2- Sm(THF)4 (ArO = OC6H2-2,6-di-tert-butyl-4-Me) can efficiently initiate the poly…     

Synthesis and Characterization of Aryl Acylguanidines and Their Copper(Ⅱ) Complexes

A series of eight N-mono-substituted aryl acylguanidines L~(1～8) were synthesized from the reactions of their parent acylthioureas and respective primary amines, including five R~1C(O)N=C(NHR~2)_2 with balanced arms(denoted as R~1–R~2–R~2: Ph–Ar'–Ar', L~1(1); Ph–Ar'–Ar', L~2(2); 1-Naph–Ar'–Ar', L~3(3); 1-Naph–Ar'–Ar', L~4(4); 2-Naph–Ar'–Ar', L`5(5); Ar' = 2,6-Me_2C_6H_3, Ar' = 2,6-iPr_2C_6H_3) and three R~1C(O)N=C(NHR~2)NHR~3 with unbalanced arms(denoted as R~1–R~2–R~3: Ph–Ar'–Ph, L~6(6); Ph–Ar' –Ph, L~7(7); Ph–Ar' –Ar', L~8(8)). Treatment of L~(1～5)(1～5) with copper acetate in a molar ratio of 2:1 in dichloromethane led to the formation of homoleptic Cu(Ⅱ) complexes trans-L_2~(n')Cu(9～13), in which the Cu(Ⅱ) center was stabilized by deprotonated ligands Ln'(n = 1～5) in the O,N-bidentate mode. When similar reactions of L~6(Ph–Ar'–Ph)(6) and L~7(Ph–Ar'–Ph)(7) that contain unbalanced arms were investigated, the Cu(Ⅱ) products trans-L_2~(6')Cu(14) and trans-L_2~(7')Cu(15) were formed by deprotonating the bulky amine groups in Ln(-NHAr' for L~6 and-NHAr' for L~7) rather than the-NHPh group. In sharp contrast, trans-L_2~(8')Cu(16) was obtained from two-arm unbalanced L~8(Ph–Ar'–Ar')(8) not by deprotonating the more bulky-NHAr' group but the relatively less bulky-NHAr' group. In a further exploration, the reaction of 1:1 mixed ligands Ln and Lm with copper acetate was found to give only homoleptic Cu(Ⅱ) complex L_2~(n')Cu instead of the heteroleptic one L~(n')CuL~(m'). The in vitro antibacterial activity of L~n was evaluated against S. aureus, E. coli and C. albicans by determining the minimum inhibitory concentrations(MICs) using Kirby-Bauer test.     

Ethylene polymerization and ethylene/hexene copolymerizaion with vandium catalysts bearing thiophenolphosphine ligands

Vanadium(Ⅲ) complexes bearing thiophenol-phosphine ligands (2a-2b) (2-R-6-PPh2-C6H2S) VCl2(THF)2 (2a: R=H; 2b: R=Me3Si) were prepared from VCl3(THF)3 by treating with 1.0 equiv of the ligand in tetrahydrofuran in the presence of excess triethylamine. The two complexes were characterized by FTIR and mass spectra as well as elemental analyses. On activation with Et2AlCl, these complexes exhibited high catalytic activities (up to 22.1 kg PE/(mmolV·h·bar)) even at high temperature (70℃), and produced high molecular weight polymers with unimodal molecular weight distributions, indicating the polymerization took place in a single-site nature. This result may be attributed to benefits of introduction of second-row donor atoms for adjusting charge density of the vanadium centers. In addition, these complexes also exhibited high catalytic activities for ethylene/1-hexene copolymerization. Catalytic activity, comonomer incorporation and polymer molecular weight can be controlled in a wide range by the variation of catalyst structure and the reaction parameters such as Al/V molar ratio, comonomer feed concentration and polymerization reaction temperature.     

Syntheses and Crystal Structure of Six－coordinated Diorgnotin Complexes with 2,5－Dimercapto－4－phenyl－1,3,4－thiodiazole

The reactions of diorganotin dichloride [Ph_2SnCl_2, (PhCH_2)_2-SnCl_2 or (n-Bu)_2SnCl_2] with potassium salt of 2,5-dimercapto-4-phenyl-1, 3, 4-thiodiazole gave complexes R_2Sn (S_3N_2C_8H_5)_2(4: R=Ph; 5: R=PhCH_2 and 6: R=n-Bu), respectively.Characterizations were carried out for all complexes by IR, ~1HNMR spectra and X-ray crystallography analysis. Including theSn…N interaction, the three complexes all have six-coordinateddistorted octahedral geometry. Based on the requence of stereo-chemical constraint sequence, phenyl≈benzyl>n-butyl, the lessthe effect of the stereochemical constraint of R groups, the     

STUDIES ON OLEFIN-COORDINATING TRANSITION METAL CARBENE COMPLEXES (Ⅺ)——SYNTHESIS, SPECTRA AND CRYSTAL STRUCTURE OF NEW TYPE OF ISOMERIZED PRODUCTS OF CYCLOHEXADIENE-(DICARBONYL) [ETHOXY(ARYL)CARBENE]IRON COMPLEXES

Reaction of 1,3-cyclohexadiene(tricarbonyl)iron I with aryllithium, ArLi (Ar=C_6H_(53)-m-, p-CH_3C_6H_4, p-CH_3OC_6H_4, p-CF_3C_6H_4), in ether at low temperature, followed by subsequent alkylstion of the acylmetalates formed with Et_3OBF_4 in aqueous solution at 0°G gave 5 crystalline compounds with the compositions of C_6H_8(CO)_2FeC(OC_2H_5)Ar Ⅱ—Ⅵ formulated as isomerized products of cyclohexadiene(dicarbonyl)[ethoxy(aryl)earbene]iron complexes based on elemental analyses, spectral studies and single crystal X-ray structure determination. The results from syntheses, spectroscopic experiments and X-ray diffraction are reported, and a possible reaction mechanism is tentatively proposed in this paper.     

苯基稀土氯化物的合成及其表征

1970年,Hart等首先合成了Sc(C_6H_5)_3、Y(C_6H_5)_3、LiLa(C_6H_5)_4和LiPr(C_6H_5)_4。1972年,Cotton等测定了[Lu(2,6-(CH_3)_2C_6H_3)_4]·[Li·4THF]的晶体结构。1986年,陈文启等人合成了Nd(C_6H_5)_3,Gd(C_6H_5)_3和LiNd(C_6H_5)_4。本文首次合成了苯基稀土氯化物C_6H_5LnCl_2·nTHF(Ln=Pr,Sm,Gd,n=3,4);C_6H_5LnCl_2·LiCl·nTHF(Ln=Pr、Nd、Sm、Gd,n=2、3、5);(C_6H_5)_2GdCl·LiCl·2THF;[(C_6H_5)_2NdCl]_2·LiCl·4THF。测定了C_6H_5GdCl_2·4THF的晶体结构。     

钼铁硫原子簇化合物的合成与结构化学——Ⅳ.双类立方烷化合物与酰氯的反应

我们曾利用类金刚烷结构的多铁巯基化合物(Et_4N)_2[Fe_4(SR)_(10)](R为拉电子的芳基C_6H_5或C_6H_4CH_3)与(Et_4N)_2MoS_4的反应,合成了一系列含有Fe(SR)_6桥的双类立方烷化合物[{Mo(FeL)_3S_4}_2(μ_2-SR)_6Fe]~(z-)(L=SR,z=4;R=Ph,1a;R=o-C_6H_4CH_3,1d;R=m-C_6H_4CH_3,1e;R=p-C_6H_4CH_3,1f)。测定了它们的单晶结构,并开展了磁学研究。确认它们都具有1的阴离子结构,其Mo-Fe-Mo’距离都在7.2A左右。当R为推电子的脂肪族基因(如Et或CH_2C_6H_5)时,其相应的距离为6.6—6.7A。原子距离的数据提示,我们     

SYNTHESIS of(η~5-C_9H_7)Ln(η~8-C_8H_8)·2THF AND CRYSTAL STRUCTURE OF(η~5-C_9H_7)Pr(η~8-C_8H_8)·2THF

The reaction of LnCl_3 with K _9H_7(C_9H_7=indenyl)andK_2C_8H_8(C_8H_8=cyclooctatetraene)in tetrahydrofuran(THF)give thecorresponding complexes(η~5-C_9H_7)Ln(η~8-C_8H_8)·2THF.The synthesis of(η~5-C_9H_7)Ln(η~8-C_8H_8)·2THF(Ln=Pr,Nd)and crystal structure of(η~5-C_9H_7)Pr(η~8-C_8H_8)·2THF are described.     

两种β-二亚胺锡化合物的合成与表征（英文）

N,N-二(2,6-二异丙基苯基)-2,4-戊二亚胺的锂盐与二甲基二氯化锡的反应以及N,N-二(2,6-二乙基苯基)-2,4-戊二亚胺的锂盐与三甲基氯化锡的反应均以物质的量比为1∶1在室温下进行,分别得到了新化合物N(Ar)=C(Me)CH=C(NHAr)CH_2SnMe_2Cl·C_7H_8(1)(Ar=2,6-iPr_2C_6H_3)和[N(Ar')C(Me)=CHC(=NAr')CH_2SnMe_2]_2·CH_2Cl_2(2)(Ar'=2,6-Et_2C_6H_3).通常来说,β-二亚胺配体与金属卤化物反应容易形成氮-金属-氮键,而化合物1和2中由于SnMe_2Cl与SnMe_3基团的路易斯酸性使得锡-氮键断裂和锡-碳键的生成得到了少见的氮-锡-碳键.化合物2是罕见的具备两个共振结构式的锡二聚体.通过核磁共振、元素分析及X射线单晶衍射分析鉴定了这两种化合物的结构.通过这两个结构的对比探讨了二聚体2的形成机理.     

钼铁硫原子簇化合物的合成与结构化学研究 Ⅱ.以Fe(SR)_6为桥的双类立方烷化合物的合成及(Et_4N)_4[Mo_2Fe_7S_8(SC_6H_4CH_3-m)_(12)]·2THF的晶体结构

在乙腈溶液中(Et_4N)_2[Fe_4(SR)_(10)]与(Et_4N)_2[MoS_4]反应半小时生成对氧极为敏感的系列黑色晶状化合物(Et_4N)_4[Mo_2Fe_7S_8(SR)_(12)(R=C_6H_5,1;R=C_6H_4CH_3-m,2;R=C_6H_4CH_3-o,3;R=C_6H_4CH_3-p,4).2·2THF晶体的分子量为2982.8,属单斜晶系;空间群为P2_1/n;α=18.022(2),b=18.375(2),c=22.254(3)A;β=71.04(1)°;V=6969(2)A~3;D_(?)=1.424g·cm~(-3);Z=2;F(000)=3108.晶体结构用直接法解出,修正至R=0.064.2.2THF中Mo…Mo′距离为7.234A.     

Zinc Complexes Supported by N,N-Dimethylaniline-arylamido Ligands： Synthesis,Characterization and Catalytic Properties for Ring-opening Polymerization of L-Lactide

The reaction of bidentate N,N-dimethylaniline-arylamido ligands,o-C6H4NMe2（CH2NHAr）（Ar =Ph,1a;2,6-Me2C6H3,1b; 2,6-Et2C6H3,1c; 2,6-ipr2C6H3,1d） with ZnEt2 yields the complexes o-C6H4（NMe2）（CH2NAr）ZnEt （2a-2d）,respectively.All the complexes were characterized by 1H and 13C NMR spectroscopy and elemental analyses.It was found that all the zinc complexes were efficient catalysts for the ring-opening polymerization of L-lactide in the presence of benzyl alcohol with good molecular weight control and narrow polydispersity.