- Phosphinite-iminopyridine iron catalysts for chemoselective alkene hydrosilylation
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A series of new pincer iron complexes with electron-donating phosphinite-iminopyridine (PNN) ligands has been prepared and characterized. These iron compounds are efficient and selective catalysts for the anti-Markovnikov alkene hydrosilylation of primary, secondary, and tertiary silanes. More importantly, the system exhibits unprecedented functional group tolerance with reactive groups such as ketones, esters, and amides. Furthermore, the iron-catalyzed alkene hydrosilylation was successfully applied to the synthesis of a valuable insecticide, silafluofen. The electronic properties and structures of the iron complexes have been studied by spectroscopies and computational methods. Overall, the iron catalysts may provide a low-cost and environmentally benign alternative to currently employed precious metal systems for alkene hydrosilylation.
- Peng, Dongjie,Zhang, Yanlu,Du, Xiaoyong,Zhang, Lei,Leng, Xuebing,Walter, Marc D.,Huang, Zheng
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p. 19154 - 19166
(2014/01/17)
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- Direct synthesis of alkylsilanes by platinum-catalyzed coupling of hydrosilanes and iodoalkanes
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Alkyl iodides and tertiary silanes were successfully coupled with good functional group tolerance using a Pt(P(tBu)3)2/(iPr) 2EtN/CH3CN system. The utility of the methodology is demonstrated by the synthesis of silafluofen, a Si-containing insecticide. This journal is The Royal Society of Chemistry.
- Inubushi, Hikaru,Kondo, Hitoshi,Lesbani, Aldes,Miyachi, Mariko,Yamanoi, Yoshinori,Nishihara, Hiroshi
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supporting information
p. 134 - 136
(2013/02/23)
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- Protective agents for wood
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Solvent-free coating materials and treating agents used as water-based wood or material protective agents containing emulsifiable binding agents, quaternary ammonium compounds and optional additional active agents. The wood or material protective agents are non-flammable and enable a uniform distribution of the binding agent and the quaternary ammonium compounds in the substrates. As a result, the quaternary ammonium compounds function as a dissolving mediator for the binding agents which are dispersed in water without opacifying effects and are used as a biocide. The agents can additionally absorb water-insoluble organic biocides without impairing the homogeneity or stability of the formulation of the homogeneity of the distribution in the substrate.
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- Fungicidal active compound combinations
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The present application relates to new active compound combinations composed, on the one hand, of prior art compounds metaconazole, 5-[(4-chlorophenyl)methyl]-2,2-dimethyl-1-(1H-1,2,4-triazol-1-yl-methyl)cyclopentanol and imidacloprid, 1-[(6-chloro-3-pyridinyl)-methyl]-4,5-dihydro-N-nitro-1H-imidazole-2-amine, and, on the other hand, of other prior-art active compounds, the combinations being extremely suitable for the protection of wood products.
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- Anti-fouling compositions
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An anti-fouling composition comprising a carrier, and a binder, the improvement which comprises an effective amount of at least one insecticide. The composition is applied to the surfaces of articles which come into contact with seawater or brackish water, especially wood. Other conventional anti-fouling agents may also be present.
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- Insecticidal compositions and methods of use employing imidacloprid and another insecticide
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The present invention relates to insecticidal mixtures of chloronicotinyl insecticides of the formula (I) STR1 in which R1 represents C1 -C5 -alkyl, R2 represents hydrogen or C1 -C5 -alkyl, or R1 and R2 together represent --CH2 --CH2 --; --CH2 --CH2 --CH2 -- or STR2 X represents an NH group, NCH3 group or represents sulphur, Y represents nitrogen or a CH group and Z represents cyano or nitro, with one or more of the synergists mentioned in the description.
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- Process for the preparation of aryldimethyl(3-aryl-propyl)silanes
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The present invention relates to a process for the preparation of compounds of the formula I STR1 where X is CH=CH, N=CH, CH=N or S, R1 and R2 independently of one another are H, halogen, alkyl, alkoxy, alkylthio, haloalkyl, haloalkoxy, haloalkylthio or the bivalent methylenedioxy group, R3 is a radical of the formulae (A), (B) or (C) STR2 where R4 and R5 independently of one another are H, halogen, alkyl, alkoxy or a radical of the formula (D) STR3 in which R6 is H or halogen and Y is CH2, O or S, and m, n, o, p and q are 0, 1, or 2, which comprises reacting a compound of the formula II where R3 is as defined in formula I, with dichloromethylsilane in the presence of a catalyst suitable for hydrosilylation reactions, and reacting the resulting intermediate of the formula III STR4 where R3 is as defined in formula I, in succession and without isolation of the resulting intermediate, with a methylmagnesium halide and an arylmagnesium halide of the general formula IV STR5 where R1, R2, m, n and X are as defined in formula I and Hal is halogen. The invention furthermore relates to the compounds of the formula III.
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- Process for the preparation of (aryl)-(dimethyl)-(3-(4-fluoro-3-aryloxyphenyl)propyl)silanes
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The present invention relates to a process for the preparation of compounds of the formula I STR1 in which R1 denotes H, halogen, (C1 -C4)-alkyl or (C1 -C4)-alkoxy and R2 denotes H, halogen, (C1 -C4)-alkyl, (C1 -C4)-alkyl-thio, (C1 -C4)-alkoxy or the bivalent group 3,4-0-CH2 -O, comprising reacting a compound of the formula II STR2 in which X denotes halogen and R2 has the meaning as in formula I, in the presence of a copper catalyst with an alkali metal phenolate or alkaline earth metal phenolate of the formula III STR3 in which M denotes an alkali metal or an alkaline earth metal and R1 has the meaning as in formula I.
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- Substituted phenyltrialkylsilane insecticides
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Compounds of the formula STR1 in which Ar is substituted or unsubstituted phenyl, pyridinyl, furanyl, naphthyl, thienyl, or thiazolyl; R is a (C1-4) alkyl; W is oxygen or methylene; and Ph is substituted or unsubstituted phenoxyphenyl, benzylph
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- Substituted phenyltrialkylsilane insecticides
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Compounds containing a dimethylsilane core and a phenoxybenzyl substituent are found to exhibit pyrethroid-like activity toward insects with low toxicity to fish.
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