卤素及三卤甲基侧取代大杂环化合物的结构和性能——Ⅱ.氧、氮、硫杂大环化合物的电子结构

用AM1方法计算了 2 0个卤素及三卤甲基侧取代氧、氮、硫杂大环化合物的电子结构。结果表明 ,这类杂环化合物分子的总能量 ,最高占据分子轨道能量 ,杂环中氧、氮、硫原子的电荷分布和空腔大小呈现出一定的规律性。它们对于络合过渡金属具有较强的选择性     

卤素及三卤甲基侧取代大杂环化合物的结构和性能——Ⅱ.氧、氮、硫杂大环化

用AM1方法计算了20个卤素及三卤甲基侧取代氧、氮、硫杂大环化合物的电子结构。结果表明,这类杂环化合物分子的总能量,最高占据分子轨道能量,杂环中氧、氮、硫原子的电荷分布和空腔大小呈现出一定的规律性。它们对于络合过渡金属具有较强的选择性。     

三氟甲基侧取代氧、氮、硫杂大环化合物的合成和分子结构

合成了四个三氟甲基侧取代氧、氮、硫杂大环化合物,通过IR、~1H NMR、MS和元素分析作了表征;用AM1方法计算它们的电子结构,并根据计算结果给出了它们的几何构型。     

三氟甲基侧取代氧、氮、硫杂大环化合物的合成和 分子结构

合成了四个三氟甲基侧取代氧、氮、硫杂大环化合物,通过IR、^1HNMR、RS和元素分析作了表征;用AM1方法计算它们的电子结构,并根据计算结果给出了它们的几何构型。     

杂原子取代卟啉的电子结构和光谱

用INDO/CI法计算了等电子氧杂、硫杂、氮杂卟啉的电子结构及低激发态电子跃迁.从前线轨道特征、电荷分布等与自由卟啉对比讨论了杂原子取代卟啉的电子结构.计算结果还预期了一些杂原子取代卟啉的低激发态电子跃迁光谱.     

光诱导单电子转移反应合成硫杂、氮杂冠醚

合成了以邻苯二甲酰亚胺为电子受体,末端三甲基硅烷基醚链为电子给体的新的分子内给受电子体系N-(末端三甲基硅烷基硫杂醚链)邻苯二甲酰亚胺(1)和N-(末端三甲基硅烷基氮杂醚链)邻苯二甲酰亚胺(2).化合物1和2在甲醇中进行光反应,在光诱导下发生分子内单电子转移反应,以很高的产率和很高的区域选择性生成硫杂冠醚(3)和氮杂冠醚(4).化合物1~4的化学结构经核磁共振、质谱的验证.     

氮、硫杂冠醚稀土配合物的合成、表征和结构研究

合成和表征了3个杂冠醚配体(L1:单氮杂15C5,L_Ⅱ:单氮杂18C6,L_Ⅲ:1,7—二硫杂18C6)与稀土硝酸盐的配合物:〔Ln(NO_3)_3L_Ⅰ〕(Ln=La～Pr),[Ln-(NO_3)-3L_ Ⅱ〕(Ln=La～Pr),〔HL_Ⅱ〕~+〔Ln(NO_3)_4(OH_2)_2〕~-(Ln=Nd,Sm～Er,Yb),〔Ln(NO_3)_3.L_Ⅲ’(H_2O)](Ln=La～Nd,Sm～Er,Yb),其中L_Ⅲ’表示L_Ⅲ冠醚环上的2个硫原子在与稀土硝酸盐反应的过程中被氧化为亚砜.配合物〔HL_Ⅱ〕~+[Nd(NO_3)_4-(OH_2)_2]的晶体属单斜晶系,空间群P2_1/n,a=1.644 0(5),b=1.739 2(3),c=1.867 5(4)nm,β=107.26(2)°.Z=8,Nd~(+3)与4个二齿NO_3~-和2个水分子配位,形成长链状夹心式结构;配合物〔Er(NO_3)_3L_Ⅲ’(H_2O)〕·CH_3COCH_3的晶体为P2_1/n空间群,a=0.877 2(2),b=1.817 9(7),c=1.854 0(5)nm,β=103.50(3)°,Z=4,Er~(3+)与3个二齿NO_3~-、1个水分子及2个亚砜氧原子形成配位数为9的配合物.     

氮硅取代的氮杂烯丙基锂、铁(Ⅱ)和钴(Ⅱ)的合成及结构(英文)

本文以[(Me2)NCH2C6H4CHSiMe2(NMe2)]Li(TMEDA)与叔丁腈为原料按1∶1加成得到氮杂烯丙基的锂化合物[{(Me2)NCH2C6H4}CHC(tBu)NSiMe2(NMe2)Li(TMEDA)]即1。然后用乙醚或四氢呋喃作溶剂化合物1和二氯化亚铁或二氯化钴按2∶1反应得到氮杂烯丙基铁或钴的化合物分别为2和3。通式为M[{(Me2)NCH2C6H4}CHC(tBu)NSiMe2(NMe2)]2(M=Fe(2),Co(3))。化合物1,2和3的结构分别用1H NMR,13C NMR,元素分析和X-射线单晶衍射技术进行了表征。晶体结构表明化合物2和3结构类似,都是以金属为对称中心的硅桥联的端基氮配位的氮杂烯丙基化合物。     

Room-Temperature Bismuth-Catalyzed Bis-arylation of Carbonyl Compounds with Aryl Ethers and Phenols

Using Bi2（SO4）3 as the catalyst and TMSCl as the additive, a wide variety of aldehydes, ketones, and acetals were smoothly condensed with aryl ethers at room temperature to provide the corresponding diarylmethanes and triarylmethanes selectively in good to excellent yields.     

The Synthesis, Reaction and Crystal Structures of Ethyltetramethylcyclopentadienylruthenium Compounds

Pentamethylcyclopentadienyl-trimethylphosphine-metal compounds play an important role in the activation studies of saturated hydrocarbons. A method to synthesize ethyltetramethylruthenium compounds was established, which started from the reaction of RuCl_3. H_2O with ethyltetramethylcyclopentadiene to give a dimer compound of 2. When 2 was reacted with different amounts of trimethylphosphine, compounds 3 [C_5Me_4EtRu(PMe_3)Cl_2] and 4 [(C_5Me_4Et)Ru(PMe_3)_2Cl] were obtained. Compound 3 is a 17-electron species which is in formula similar to Bergman's Ir compound used in hydrocarbon activation reaction, but might be more reactive because of its unsaturated electron structure. The crystal structure analysis of compounds 2, 3 and 4, showed that the ruthenium atom was coordinated in a "threeleg-piano-stool" geometry in all the three compounds. The Ru—Cl bond in 3 and 4 was lengthened, making it labile to other substitution reactions.     

13-Membered Azo- and Azoxycrown Compounds with Sulfur Atom in Long Side Chain

Abstract

A facile way to obtain azo- and azoxycrown ethers with sulfur atom in side chain has been developed. Applicability of these crown ethers in sodium-sensitive membrane electrodes has been studied. Formation of Langmuir-Blodgett monolayers of amphiphilic azocrown ethers on aqueous subphase has been investigated.     

对甲苯基硫脲和对溴苯基硫脲的晶体结构和电子结构

本文测定了对甲苯基硫脲(1)和对溴苯基硫脲(2)的晶体结构,并用 CNDO/2程序对生物活性较大的对甲苯基硫脲分子进行了量子化学计算。1属单斜晶系,空间群 P2_1/n,a=0.5618(1),b=0.8487(4),c=1.7865(3)nm,Bβ=93.53(1)°,Z=4,D。=1.298 g·cm~(-3),最终偏离因子 R=0.0396;2属单斜晶系,空间群 P 2_1/n,a=0.9096(6),b=0.8991(4),c=1.0659(8)nm,β=105.59(6)°,Z=4,D。=1.836g·Cm~(-3),最终偏离因子R=0.073。晶体结构测定结果表明,硫脲部分的四个原子组成平面三角形,苯环平面与硫脲平面的夹角分别为63.5°和68.6°。量化计算结果和晶体结构测定相吻合。     

Synthesis of D-Glucose-based Azacrown Ethers with Phosphinoxidoalkyl Side Chains and Their Application to an Enantioselective Reaction

Five chiral -D-glucose-based monoaza-15-crown-5 ethers with phosphinoxidoalkyl side chains of one to five carbon atoms (5a–e)have been synthesised. The cation binding ability of the new lariat ethers was evaluated bythe picrate extraction method. The substituents at the nitrogen atom were not a major influenceon the cation extraction ability of the azacrown ether; the compounds showed, however, a significant asymmetric induction as phase transfer catalysts in the Michael addition of2-nitropropane to chalcone (95% ee).