Synthesis and Properties of Palladium Diselenolenes: X-ray Crystal Structures of [Pd{SeC(R<sup>1</sup>)C(R<sup>2</sup>)Se}(PBu<sub>3</sub>)<sub>2</sub>] [R<sup>1</sup>, R<sup>2</sup> = (CH<sub>2</sub>)<i><sub>n</sub></i>, <i>n</i> = 4, 5, 6]
作者:Susan Ford、Christopher P. Morley、Massimo Di Vaira
DOI:10.1021/ic040069y
日期:2004.11.1
The reaction between [Pd(2)(dba)(3)] (dba = dibenzylideneacetone), tributylphosphine, and a bis(cycloalkeno)-1,4-diselenin leads to either a mononuclear diselenolene [Pd[SeC(R(1))=C(R(2))Se](PBu(3))(2)] or a dinuclear diselenolene [Pd(2)[SeC(R(1))=C(R(2))Se](2)(PBu(3))(2)] [R(1), R(2) = (CH(2))(n), n = 4, 5, 6] depending on the stoichiometry employed. Treatment of the dinuclear diselenolenes with 1
treated with an excess amount of olefins at 130°C, the addition of a vinyl radical, which was generated in situ by the denitrogenation of 1,2,3-selenadiazoles, to a carbon–carbon double bond followed by intramolecular cyclization proceeded efficiently giving the corresponding dihydroselenophenenes in moderate to good yields along with the formation of the corresponding 1,4-diselenins and selenophenes
It was found that the reaction of 1,2,3-selenadiazoles derived from cyclic ketones with olefins or dienes was markedly promoted by a catalytic amount of tributylstannyl radical, which was generated in situ from tributylstannyl hydride or allyltributylstannane and AIBN, to give the corresponding dihydroselenophenes in moderate to good yields. In contrast, when 1,2,3-selenadiazoles prepared from linear
When 1,2,3-selenadiazoles were treated with an excess amount of olefins in the presence of a catalytic amount of Bu3SnH and AIBN, the addition of a vinyl radical, which was generated in situ by the denitrogenation of 1,2,3-selenadiazoles, to the carbon-carbon double bond followed by intramolecular cyclization proceeded efficiently to afford the corresponding dihydroselenophenes in moderate to good
Synthesis of mono- and di-nuclear palladium diselenolenes from bis(cycloalkeno)-1,4-diselenins: X-ray crystal structure of [Pd(C7H10Se2)(PBu3)2]
作者:Susan Ford、Christopher P. Morley、Massimo Di Vaira
DOI:10.1039/a904853g
日期:——
The reaction between [Pd2(dba)3] (dba=dibenzylideneacetone), tributylphosphine, and a bis(cycloalkeno)-1,4-diseleninleads to either a mononuclear [PdSeC(R1)2 C(R2)Se}(PBu3)2], or a dinuclear [Pd2SeC(R1)2 C(R2)Se}2(PBu3)2] diselenolene (R1–R2=(CH2)
n
;
n
=4, 5,6) depending on the stoichiometry employed; the structure of the monomeric product with
n
=5 has been determined by X-ray crystallography.
[Pd2(dba)3](dba=二亚苄基丙酮)、三丁基膦和双(环烯)-1,4-二硒烯发生反应,生成单核[PdSeC(R1)2 C(R2)Se}(PBu3)2] 或双核[Pd2SeC(R1)2 C(R2)Se}2(PBu3)2] 二硒烯(R1-R2=(CH2) n ;
n =4、5、6),具体取决于所采用的化学计量学;n =5 的单体产物的结构已通过 X 射线晶体学确定。