Synthesis and Structure of a Hexacoordinate Carbon Compound
摘要:
In an exploration of six coordination and hypervalence in carbon compounds, steric constraints have been employed to bring four ether O atoms in close proximity to an allenic carbon atom. The dimethylated dication 2 is confirmed to have hexacoordinate carbon by experimental charge density analysis and DFT calculations and is arguably hypervalent.
Synthesis and Structure of 1,8-Dimethoxy-10-methyl-9-methylene-9H-thioxanthenium Salt—Possibility of Hypervalent Bonding Through O─C─O (?)
摘要:
1.8-dimethoxy-10-methylene-9H-thioxanthenium salt (4) was prepared and the structure was determined by X-ray analysis to show the bond length between O-C is 2.80 A. This is too long to effect a hypervalent bonding. Bis[(1.8-dimethoxy) thioxanthylidene]allene (5) was prepared to be a symmetric compound in solution. Methylation of 5 with Meerwein reagent afforded S-monomethylated product (6) in solution and 6 gradually decomposed to C (or S)-monoprotonated allene (7), which was separately prepared as stable compound.
1.8-dimethoxy-10-methylene-9H-thioxanthenium salt (4) was prepared and the structure was determined by X-ray analysis to show the bond length between O-C is 2.80 A. This is too long to effect a hypervalent bonding. Bis[(1.8-dimethoxy) thioxanthylidene]allene (5) was prepared to be a symmetric compound in solution. Methylation of 5 with Meerwein reagent afforded S-monomethylated product (6) in solution and 6 gradually decomposed to C (or S)-monoprotonated allene (7), which was separately prepared as stable compound.
Synthesis and Structure of a Hexacoordinate Carbon Compound
作者:Torahiko Yamaguchi、Yohsuke Yamamoto、Daisuke Kinoshita、Kin-ya Akiba、Yun Zhang、Christopher A. Reed、Daisuke Hashizume、Fujiko Iwasaki
DOI:10.1021/ja710423d
日期:2008.6.1
In an exploration of six coordination and hypervalence in carbon compounds, steric constraints have been employed to bring four ether O atoms in close proximity to an allenic carbon atom. The dimethylated dication 2 is confirmed to have hexacoordinate carbon by experimental charge density analysis and DFT calculations and is arguably hypervalent.