1449-63-4Relevant academic research and scientific papers
Photochemical reactions of 2-(pentamethyldisilanyl)furan and 2-(pentamethyldigermanyl)furan. Formation of a radical pair
Mochida, Kunio,Kimijima, Kohichi,Wakasa, Masanobu,Hayashi, Hisaharu
, p. 101 - 108 (2007/10/02)
Photochemical reactions of 2-(pentamethyldisilanyl)furan and 2-(pentamethyldigermanyl)furan have been investigated by chemical trapping experiments and laser flash-photolysis.On irradiation, the furylated catenates of Group 14 elements undergo silicon-silicon ? bond and germanium-germanium ? bond homolysis to give a pair of silyl radicals and germyl radicals, respectively.In CCl4, these radicals are converted to the corresponding chlorides by abstraction of a chlorine atom.In nonhalogenated solvents (cyclohexane and other hydrocarbons), the silyl radical pair undergoes a disproportionation to give as main products a monosilane and a silene.The trimethylgermyl radical mainly couples at the ipso-position of the furyl group of the pairing radical to yield the corresponding diradical.This diradical undergoes elimination of a divalent species, dimethylgermylene, with concomitant formation of 2-(trimethylgermyl)furan. Key words: Photochemistry; Silanyl; Germanyl; Radical
Photochemical reactions of aryl-substituted catenates of group 4B elements, PhMe2E-E'Me3 (E, E' = Si and Ge). Formation of a radical pair
Mochida, Kunio,Kikkawa, Haruhiko,Nakadaira, Yasuhiro
, p. 9 - 19 (2007/10/02)
Photochemical reactions of phenyl substituted catenates of group 4B elements, PhMe2E-E'Me3 (E, E' = Si and Ge) have been investigated by chemical trapping experiments and laser flash-photolysis.On irradiation, the phenylated group 4B catenate undergoes E-E' bond homolysis to give a pair of radicals (PhMe2E. and Me3E'.).In CCl4, these radicals are converted to the corresponding chlorides by abstraction of a chlorine atom.In a nonhalogenated solvent, the radical pair couples at the ipso-position of the phenyl group of the pairing radical (PhMe2E.) to yield the cor responding diradical.This undergoes either elimination of a divalent species (Me2E:) with concomitant formation of trimethylphenyl group 4B element PhMe3E') or intramolecular 1,2-group 4B element migration to yield group 4B metal-carbon double bonded species.The radical escapes from the solvent cage coupled to the metal atom of the radical to yield the dimetallic product.The reaction path observed is highly dependent on the nature of the group 4B element comprising the phenyl substituted catenate.
Photochemical Reactions of Vinyl-, Styryl- and Benzyl-Substituted Digermanes
Mochida, Kunio,Kikkawa, Haruhiko,Nakadaira, Yasuhiro
, p. 2772 - 2777 (2007/10/02)
Photochemical reactions of vinyl-, styryl- and benzyl-substituted digermanes by chemical trapping experiments.Photolysis of vinylpentamethyldigermane afforded 1-trimethyl-2-(pentamethyldigermyl)ethane as a major product, and styrylpentamethyldigermanes gave mainly styryltrimethylgermane.On the other hand, photolysis of benzyl-substituted digermanes (benzylpentamethyldigermane and 1,2-dibenzyltetramethyldigermane) gave hydrogermanes and hydrodigermanes as main products, respectively.These products were derived from germyl radicals generated by photoinduced homolysis of the germanium-germanium bond.In carbon tetra chloride (CCl4), these germyl radicals were converted to the corresponding chlorogermanes by abstraction of a chlorine atom.Germylene species were also to be evolved from such photolyses.
Photochemical Reactions of Aryl-Substituted Digermanes through a Pair of Organogermyl Radicals
Mochida, Kunio,Wakasa, Masanobu,Sakaguchi, Yoshio,Hayashi, Hisaharu
, p. 1889 - 1895 (2007/10/02)
The photochemical reactions of aryl-substituted digermanes were investigated by trapping experiments and a laser flash photolysis technique.The photolysis of phenylated digermanes resulted in germanium-germanium bond homolysis to give a pair of two germyl radicals.The germyl radicals abstracted a chlorine atom from carbon tetrachloride to give chlorogermanes.The pair of germyl radicals also underwent ipso-substitution, which was a precursor of the germylenes.The mechanism for the photochemistry of phenylated digermenes is discussed.
Transition-metal Carbonyl Derivatives of the Germanes. Part 17. Tetracarbonylgermyl(trimethylgermyl)iron, , its Conversion into 2>, and hence to (characterised by X-Ray Crystallography) via
Anema, Skelte G.,Audett (nee Christie), Judy A.,Mackay, Kenneth M.,Nicholson, Brian K.
, p. 2629 - 2634 (2007/10/02)
The synthesis and spectroscopic characterisation of the mixed germane derivative (3) are described.This compound eliminates GeMe3H to give quantitatively 2> (4), which has a Fe2Ge2 four-membered ring.The GeH2 units of (4) react with , eliminating H2 and CO, to give (7).Quantitative loss of CO from (7) gives (8) which has been shown by an X-ray crystal structure determination to contain linked Co2Ge and Fe2Ge triangles.
Photochemistry of Phenylpentamethyldigermane
Mochida, Kunio,Kikkawa, Haruhiko,Nakadaira, Yasuhiro
, p. 1089 - 1092 (2007/10/02)
Photolysis of phenylpentamethyldigermane afforded hydrogermanes and digermanes, as main products.These are derived from two germyl radicals generated by photo-induced homolysis of the germanium-germanium bond.Dimethylgermylene is shown to be evolved also
Organometallic compounds of the lanthanides. 42. Bis(dimethoxyethane)lithium bis(cyclopentadienyl)bis(trimethylsilyl)lanthanide complexes
Schumann, Herbert,Nickel, Siegbert,Loebel, J?rg,Pickardt, Joachim
, p. 2004 - 2009 (2008/10/08)
The trichlorides of Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu react with NaC5H5 in tetrahydrofuran in the presence of dimethoxyethane (dme) with formation of bis(cyclopentadienyl)lanthanide chloride complexes of the types (C5H5)2Ln(μ-Cl)2Na(dme). The reactions of these organolanthanide halide complexes with (trimethylsilyl)lithium in dme yield compounds of the type [Li(dme)2][(C6H5)2Ln(SiMe 3)2] (Ln = Sm, Dy, Ho, Er, Tm, Lu). (C5H5)2Sm(μ-Cl)2Na(dme) reacts with (trimethylgermyl)lithium in dme/pentane with formation of [Li(dme)3][(C5H5)3SmClSin(C 5H5)3] (7a). The new compounds have been characterized by elemental analyses and IR and NMR spectra. The structure of [Li(dme)3][(C5H5)3SmClSm(C 5H5)3] (7a) has been elucidated through complete X-ray analysis. The crystals are monoclinic with a = 14.00 (1) A?, b = 13.38 (2) A?, c = 23.49 (3) A?, β = 93.37 (9)°, space group P21/n, Z = 4, and R = 0.0411 for 4671 reflections. The [Cp3SmClSmCp3]- anion consists of two Cp3Sm unite bridged by a chlorine atom with Sm-Cl distances of 2.827 (2) and 2.798 (2) A?.
The Reaction of Calcium Atoms with Group 4B Catenates, Me3E-E'Me2R (E, E'=Si, Ge, Sn; R=Me, Cl)
Mochida, Kunio,Yamanishi, Takayuki
, p. 3429 - 3430 (2007/10/02)
Calcium atoms are thought to be inserted into E-E' bonds of group 4B catenates, Me3E-E'Me2R (E, E'=Si, Ge, Sn; R=Me, Cl) to give the corresponding Me3E-Ca-E'Me2R compounds.
REACTIONS OF (CH3)3SnM(CH3)3 (M = Si; Ge) WITH CHLOROTRIMETHYLSTANNANE AND DICHLORODIMETHYLSTANNANE IN METHANOL SOLUTION
Cuthberston, Matthew J.,Wells, Peter R.
, p. 25 - 38 (2007/10/02)
The reactions of (CH3)3SnM(CH3)3 for M = Si and Ge with (CH3)3SnCl or (CH3)2SnCl2 in methanol follow the same path as the corresponding reactions of (CH3)6Sn2, and involve Sn-CH3 cleavage at essentially the same rate.Complications arise from reaction of H
