Reactions of bis(trifluoromethyl)mercury: the synthesis and properties of methyl(trifluoromethyl)-stannanes and -plumbanes
作者:Reint Eujen、Richard J. Lagow
DOI:10.1039/dt9780000541
日期:——
reactions of Hg(CF3)2 with Group 4 organometalliccompounds MMe4(M = Si,Ge,Sn, or Pb), MMe3(CF3)(M = Sn or Pb), and M2R6(M = Si or Sn, R = Me; M = Ge, Sn, or Pb, R = Ph) have been investigated. Exchange of one CF3, group with a methyl group occurs for SnMe4, SnMe3(CF3), and PbMe4; the lead derivative reacts much more readily than the tincompound. Cleavage of the metal-metal bond with formation of MR3(CF3)
Hg(CF 3)2与4族有机金属化合物MMe 4(M = Si,Ge,Sn或Pb),MMe 3(CF 3)(M = Sn或Pb)和M 2 R 6(M = Si或Sn,R = Me; M = Ge,Sn或Pb,R = Ph)已被研究。SnMe 4,SnMe 3(CF 3)和PbMe 4发生一个CF 3基与甲基的交换。铅衍生物比锡化合物更容易反应。对于Sn 2 Me 6,已经实现了金属-金属键的裂解以及MR 3(CF 3)的形成但是对于Si 2 Me 6和六苯基衍生物却不发生。研究了PbMe 3(CF 3)与溴,氯化氢和水的反应及其热稳定性。讨论了第4组混合三氟甲基-甲基衍生物的光谱性质。
The thermal conversions of 6,6-difluorobicyclo[3.1.0]hex-2-enes to fluorobenzenes. An interesting dichotomy of mechanisms
1.0]hex-2-ene systems led to the conclusion that drastically different mechanisms operate for the two reactions. Activation parameters, solvent effects, kinetic isotope effects, isotope labelling experiments and observation of reactive intermediates all contributed to the conclusion that the reaction of 6,6-difluorobicyclo[3.1.0]hex-2-ene, 1, proceeds via a homolytic hydrogen-shift rearrangement, while
Heterobimetallische Komplexe von Titan(IV) Quecksilber(II) und Platin(II) Quecksilber(II)
作者:W. Frosch、A. del Villar、H. Lang
DOI:10.1016/s0022-328x(00)00122-4
日期:2000.5
R1=SiMe3} with several mercury(II) compounds HgX2 (2a: X=CN, 2b: X=OCN, 2c: X=OAc, 2d: X=SCN, 2e: X=O2CCF3, 2f: X=Cl, 2g: X=I) and Hg(R2)(R3) (6a: R2=C6H5, R3=CF3; 6b: R2=R3=C6H5) is described. Depending on the nature of X, R2 and R3 different products are formed: Reaction of 1a with Hg(CN)2 (2a) and Hg(CF3)(C6H5) (6a) produces the heterobimetallic titanium(IV)mercury(II) complexes [Ti](CCC6H5)2}Hg(CN)2
钛[Ti](CCR的反应1)2 - [钛] =(η 5 -C 5 H ^ 4森达3)2的Ti; 1A,R 1 = C 6 H ^ 5,1B,R 1 =森达3 }与几个汞(II)化合物HGX 2(图2a:X = CN,2B:X = OCN,2c中:X = OAC,2d中:X = SCN,2E:X = O 2 CCF 3,2F:X =氯,2克:X = I)和Hg(R 2(R 3)(6a:R 2= C 6 H 5,R 3= CF 3;6b:R 2= R 3= C 6 H 5)被描述。根据X,R 2和R 3的性质,形成不同的产物:1a与Hg(CN)2(2a)和Hg(CF 3)(C 6 H 5)(6a)反应生成异双金属钛(IV )mercuryII)络合物钛[Ti](CCC(6 ħ5)2 }汞柱(CN)2(图3a)和[钛](CCC 6 ħ 5)2 }汞柱(CF 3)(C 6 H ^ 5)(7),而反应1B与汞(
The kinetic and thermodynamic influence of fluorine versus methyl substituents in methylenecyclopropane rearrangements
作者:William R. Dolbier、Conrad R. Burkholder、Alba Lucia Chaves、Astor Green
DOI:10.1016/0022-1139(95)00376-2
日期:1996.3
review of the kinetic and thermodynamic influences of methyl and fluorinesubstituents on the methylenecyclopropane rearrangement is presented. In spite of a superficial similarity of the overall influence of these two substituents, methyl's effect derives largely from the incremental nature of its radical- and alkene-stabilizing, and steric impact, while fluorine'seffect derives from its large and
This invention relates to a range of 1-aryl-4-cyclopropylpyrazoles in which there is at least one fluorine attached to the cyclopropyl ring, to compositions comprising such compounds, processes to their synthesis and their use as parasiticides.