39489-71-9Relevant academic research and scientific papers
Synthesis, X-ray Structure and Reactions of (2-Oxoalkyl)triarylbismuthonium Salts
Matano, Yoshihiro,Azuma, Nagao,Suzuki, Hitomi
, p. 1739 - 1748 (2007/10/02)
Treatment of triarylbismuth difluorides 1 with silyl enol ethers 2 in the presence of boron trifluoride-diethyl ether or trimethylsilyl trifluoromethanesulfonate (triflate) gave (2-oxoalkyl)triarylbismuthonium tetrafluoroborates 3 and triflates 4 in good yields.A similar reaction of the difluorides 1 with hexamethyldisiloxane in the presence of the latter acid reagent led to the formation of oxybis(triarylbismuth) ditriflates 5.X-Ray crystallographic analyses of compounds 3a, 4a and 5a showed that the first two onium salts have a distorted tetrahedral geometry and the last, a μ-oxo type compound, has a distorted trigonal bipyramidal geometry around the bismuth centre.The stability of these bismuthonium salts may reasonably be attributed to the intramolecular coordinative interaction between the bismuth and oxygen atoms and also low nucleophilicity of the counter ions employed.The bismuthonium salt 3f readily underwent onium exchange with the phosphine 6 and the sulfide 9 to afford the corresponding phosphonium and sulfonium salts 7 and 10.The salts 3 and 4 also underwent coupling with a variety of nucleophiles such as the enolate 11, piperidine 13, the phenoxides 15, the thiolates 17, the sulfinate 19 and the halides 21 to afford the corresponding α-substituted ketones 12, 14, 16, 18, 20 and 22 in moderate to good yields, together with a good recovery of triphenylbismuthine 8.
A Novel Synthesis of Alkylbismuthonium Salts and their Reaction with Some Nucleophiles. First X-Ray Structural Analysis of a Stabilized Alkylbismuthonium Tetrafluoroborate
Matano, Yoshihiro,Azuma, Nagao,Suzuki, Hitomi
, p. 8457 - 8460 (2007/10/02)
Treatment of triarylbismuth difluorides 1 with silyl enol ethers 2 in the presence of BF3*OEt2 gives (2-oxoalkyl)triarylbismuthonium tetrafluoroborates 3 as a stable crystalline solid, the bismuth centre of which has been found by X-ray analysis to posses
Fungicidal imidazol-1-yl-carboxylic acid ester derivatives
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, (2008/06/13)
This invention provides an imidazol-1-yl-carboxylic acid ester derivative represented by the formula STR1 wherein R1 is lower alkyl, cycloalkyl or R3 (CH3)2 C--(wherein R3 is halogenomethyl, acyloxymethyl or alkoxycarbonyl), R2 is a hydrogen atom, lower alkyl or cycloalkyl, X is a hydrogen atom, halogen atom, lower alkyl, cycloalkyl, lower alkenyl, lower alkoxyl, lower alkenyloxy, lower alkynyloxy, lower alkylthio, haloalkyl, haloalkenyl, substituted or unsubstituted phenyl, substituted or unsubstiuted benzyl, substituted or unsubstituted phenoxy, nitro, cyano, --COR4 l (wherein R4 is lower alkoxyl, lower alkenyloxy, benzyloxy, lower alkylamino or anilino)or STR2 (wherein R5 and R6 are each lower alkyl, acyl, sulfonyl or lower alkoxycarbonyl), n is an integer of from 1 to 3, Y and Z are the same or different and are each an oxygen atom or sulfur atom, a is 0 or 1, and b is 1 or 2, process for preparing the derivative, and a fungicidal composition comprising the derivative as an active component.
