3937-28-8Relevant academic research and scientific papers
PROCESS FOR PREPARING ORGANOCHLOROSILANES BY DEHYDROHALOGENATIVE COUPLING REACTION OF ALKYL HALIDES WITH CHLOROSILANES
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, (2008/06/13)
The present invention relates to a process for preparing organochlorosilanes and more particularly, to the process for preparing organochlorosilanes of formula I by a dehydrohalogenative coupling of hydrochlorosilanes of formula II with organic halides of formula III in the presence of quaternary phosphonium salt as a catalyst to provide better economical matter and yield compared with conventional methods, because only catalytic amount of phosphonium chloride is required and the catalyst can be separated from the reaction mixture and recycled easily, wherein R1 represents hydrogen, chloro, or methyl; X represents chloro or bromo; R2 is selected from the group consisting of C1-17 alkyl, C1-10 fluorinated alkyl with partial or full fluorination, C2-5 alkenyl, silyl containing alkyl group represented by (CH2)nSiMe3-mClm wherein n is an integer of 0 to 2 and m is an integer of 0 to 3, aromatic group represented by Ar(R′)q wherein Ar is C6-14 aromatic hydrocarbon, R′ is C1-4 alkyl, halogen, alkoxy, or vinyl, and q is an integer of 0 to 5, haloalkyl group represented by (CH2)pX wherein p is an integer of 1 to 9 and X is chloro or bromo, and aromatic hydrocarbon represented by ArCH2X wherein Ar is C6-14 aromatic hydrocarbons and X is a chloro or bromo; R3 is hydrogen, C1-6 alkyl, aromatic group represented by Ar(R′)q wherein Ar is C6-14 aromatic hydrocarbon, R′ is C1-4 alkyl, halogen, alkoxy, or vinyl, and q is an integer of 0 to 5; and R4 in formula I is the same as R2 in formula III and further, R4 can also be (CH2)pSiR1Cl2 or ArCH2SiR1Cl2, when R2 in formula III is (CH2)pX or ArCH2X, which is formed from the coupling reaction of X—(CH2)p+1—X or XCH2ArCH2X with the compounds of formula II; or when R2 and R3 are covalently bonded to each other to form a cyclic compounds of cyclopentyl or cyclohexyl group, R3 and R4 are also covalently bonded to each other in the same fashion.
Process for preparing organochlorosilanes by dehydrohalogenative coupling reaction of alkyl halides with chlorosilanes
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, (2008/06/13)
The present invention relates to a process for preparing organochlorosilanes and more particularly, to the process for preparing organochlorosilanes of R4R3CHSiR1Cl2(I) by a dehydrohalogenative coupling of hydrochlorosilanes of HSiR1Cl2(II) with organic halides of R2R3CHX (III) in the presence of quaternary phosphonium salt as a catalyst to provide better economical matter and yield compared with conventional methods, because only a catalytic amount of phosphonium chloride is required and the catalyst can be separated from the reaction mixture and recycled easily.
Dehydrohalogenative coupling reaction of organic halides with silanes
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, (2008/06/13)
The present invention relates to methods for making the compounds of formula I which is a dehydrohalogenative coupling of hydrochlorosilanes of formula II with organic halides of formula III in the presence of a Lewis base catalyst. R3CH2SiR1Cl2??(I) HSiR1Cl2??(II) R2CH2X??(III) In formulas I and II, R1represents a hydrogen, chloro, or methyl; in formula III, X represents a chloro or bromo; in formula III, R2can be selected from the group consisting of a C1-17alkyl, a C1-10fluorinated alkyl with partial or full fluorination, a C1-5alkenyl groups, a silyl group containing alkyls, (CH2)nSiMe3-mClmwherein n is 0 to 2 and m is 0 to 3, aromatic groups, Ar(R′)1wherein Ar is C6-14aromatic hydrocarbon, R′ is a C1-4alkyl, halogen, alkoxy, or vinyl, and q is 0 to 5, a haloalkyl group, (CH2)pX wherein p is 1 to 9 and X is a chloro or bromo; or an aromatic hydrocarbon, Ar CH2X wherein Ar is C6-14aromatic hydrocarbon and X is a chloro or bromo. in formula I, R3is the same as R2in formula III and further, R3can also be (CH2)pSiR1Cl2or ArCH2SiR1Cl2when R2in formula III is (CH2)pX or ArCH2X, because of the coupling reaction of X with the compound of formula II.
Synthesis and Characterization of Simple α-Sila- and α,ω-Disilaalkanes: Precursors for the CVD Production of Amorphous Silicon a-SiC:H
Schmidbaur, Hubert,Doerzbach, Cornelia
, p. 1088 - 1096 (2007/10/02)
Preparative methods have been explored for the synthesis of small, volatile polysilaalkanes, which could serve as starting materials for the production of amorphous silicon a-SiC:H.High yield pathways have been developed for H3SiCH2CH2SiH3 and H3SiCH2CH2CH2SiH3.These compounds can be converted into symmetrically halogen-functional derivatives through the reactions with SnCl4 or Br2.The homologous H3SiCH2CH2SiH2CH3 has also been prepared and halogenated, starting from the corresponding vinylsilane via the hydrosilylation route.Allylsilanes were the source of the synthesis of H3SiCH2CH=CH2, CH3SiH2CH2CH=CH2, SiH2(CH2CH=CH2)2, SiH2(CH2CH2CH2SiH3)2, or HSi(CH2CH2CH2SiH3)3.Methylated derivatives are also available. - Some physical and spectroscopic properties of the new compounds have been investigated.In particular, NMR data were collected and used for an assessment of structure and isomerism. - Key words: Disilaalkanes, Silanes, Amorphous Silicon, Hydrosilylation
