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含有螯合 1,2-二碳杂-closo-十二硼烷-1,2-二硫醇配体的 16 电子半三明治钴化合物对甲基丙炔酸酯和二硫配体的反应性。

Reactivity of 16-electron half-sandwich cobalt compounds containing a chelating 1,2-dicarba-closo-dodecaborane-1,2-dithiolate ligand towards methyl propiolate and dithio ligands.

机构信息

State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.

出版信息

Dalton Trans. 2012 Oct 21;41(39):12054-63. doi: 10.1039/c2dt31425h.

DOI:10.1039/c2dt31425h
PMID:22911065
Abstract

The reaction of the 16-electron half-sandwich complex MeCpCo(S2C2B10H10) (1b; MeCp = methylcyclopentadienyl) and methyl propiolate (HC≡CCO2Me) at ambient temperature leads to MeCpCo(S2C2B10H9)(CH=CHCO2Me) (2), MeCpCo(S2C2B10H8)(CH=CHCO2Me)2 (3), MeCpCo-(S2C2B10H9)MeO2CC=CH(MeO2C)C=CH) (4) and MeCpCo(S2C2B10H9)-(CH2CCO2Me) (5). The reaction of Me4CpCo(S2C2B10H10) (1c; Me4Cp = tetramethylcyclopentadienyl) and the alkyne gives rise to Me4CpCo(S2C2B10H10)[MeO2CC=CH(MeO2C)C=CH] (6) and Me4CpCo(S2C2B10H9)(CH2CCO2Me) (7). Both 2 and 3 are 16-electron complexes but containing a B(3)-substituted o-carborane-1,2-dithiolate ligand in 2 and a B(3,6)-disubstituted o-carborane-1,2-dithiolate ligand in 3, respectively. In 4 and 6, two alkynes are inserted into one Co–S bond to meet an 18 electron configuration at metal, however, 4 has one B-substitution at carborane. Both 5 and 7 have the same structural type bearing a B–CH2 unit. The reactions of Cp#Co(E2C2B10H10) [Cp# = Cp (1a), MeCp (1b), Me4Cp (1c) and Me5Cp (1d); E = S, Se] with 2-methylpropanedithioic acid (L1) or pyrrolidine-1-carbodithioic acid (L2) lead to Co[S2CCH(CH3)2]3 (8) or Co[S2CN(CH2)4]3 (9), respectively, in an octahedral geometry. The three-component reactions of 1a–1d, methyl propiolate and L1 or L2 afford seven new compounds Cp#Co[S2C2B10H10(CH=CHCO2Me)][S2CCH(CH3)2] [Cp# = Cp (10a), MeCp (10b) and Me4Cp (10c)], [S2CCH(CH3)2]2Co(S2C2B10H10)(CH=CCO2Me){CpCo[S2CCH(CH3)2]} (11a), Cp#Co[S2C2B10H10(CH=CHCO2Me)][S2CN(CH2)4] [Cp# = Cp (12a), MeCp (12b) and Me4Cp (12c)]. All 10a–10c and 12a–12c contain one deprotonated L1 or L2 ligand and one reduced alkyne. 11a has two 18-electron Co centers linked by one reduced alkyne. One metal is coordinated by an o-carborane-1,2-dithiolate and two L1 ligands, and the other is coordinated by one L1 ligand and one η5-Cp unit. In both two- and three-component reactions the reactivity of the 16-electron half-sandwich complexes Cp#Co(S2C2B10H10) is dependent on the size of the Cp# unit. All compounds were fully characterized by spectroscopic techniques and elemental analysis. The solid-state structures of 4, 5, 7, 10a and 11a were further determined by X-ray crystallographic analysis.

摘要

反应的 16 电子半夹心复合物甲基环戊二烯基钴( S2C2B10H10 )( 1b ;甲基环戊二烯基)和甲基丙炔酸酯( HC≡CCO2Me )在环境温度下导致 MeCpCo ( S2C2B10H9 )( CH=CHCO2Me )( 2 ), MeCpCo ( S2C2B10H8 )( CH=CHCO2Me ) 2 ( 3 ), MeCpCo- ( S2C2B10H9 ) [ MeO2CC=CH ( MeO2C ) C=CH )]( CH=CHCO2Me )( 4 )和 MeCpCo ( S2C2B10H9 ) - ( CH2CCO2Me )( 5 )。 Me4CpCo ( S2C2B10H10 )( 1c ; Me4Cp = 四甲基环戊二烯基)与炔烃的反应生成 Me4CpCo ( S2C2B10H10 ) [ MeO2CC=CH ( MeO2C ) C=CH )]( 6 )和 Me4CpCo ( S2C2B10H9 )( CH2CCO2Me )( 7 )。 2 和 3 都是 16 电子配合物,但在 2 中含有一个硼( 3 )取代的 o-卡硼烷-1,2-二硫醇配体,在 3 中含有一个硼( 3,6 )取代的 o-卡硼烷-1,2-二硫醇配体。在 4 和 6 中,两个炔烃插入到一个 Co–S 键中,以满足金属的 18 电子配置,但 4 具有一个在卡硼烷上的硼取代。 5 和 7 具有相同的结构类型,带有 B–CH2 单元。 Cp#Co ( E2C2B10H10 )[Cp# = Cp ( 1a ), MeCp ( 1b ), Me4Cp ( 1c )和 Me5Cp ( 1d ); E = S , Se]与 2-甲基丙二硫酸( L1 )或吡咯烷-1- 碳二硫酸( L2 )反应分别得到 Co[S2CCH ( CH3 ) 2] 3 ( 8 )或 Co[S2CN ( CH2 ) 4] 3 ( 9 ),它们在八面体几何结构中。 1a-1d 、甲基丙炔酸酯和 L1 或 L2 的三组分反应得到七种新化合物 Cp#Co[S2C2B10H10 ( CH=CHCO2Me )][S2CCH ( CH3 ) 2] [Cp# = Cp ( 10a ), MeCp ( 10b )和 Me4Cp ( 10c )],[S2CCH ( CH3 ) 2] 2Co ( S2C2B10H10 )( CH=CCO2Me ){CpCo[S2CCH ( CH3 ) 2]} ( 11a ), Cp#Co[S2C2B10H10 ( CH=CHCO2Me )][S2CN ( CH2 ) 4] [Cp# = Cp ( 12a ), MeCp ( 12b )和 Me4Cp ( 12c )]。所有 10a-10c 和 12a-12c 都含有一个去质子化的 L1 或 L2 配体和一个还原的炔烃。 11a 具有两个通过一个还原的炔烃连接的 18 电子 Co 中心。一个金属由一个 o-卡硼烷-1,2-二硫醇配体和两个 L1 配体配位,另一个由一个 L1 配体和一个 η5-Cp 单元配位。在二组分和三组分反应中, 16 电子半夹心复合物 Cp#Co ( S2C2B10H10 )的反应性取决于 Cp# 单元的大小。所有化合物均通过光谱技术和元素分析进行了充分表征。 4 、 5 、 7 、 10a 和 11a 的固态结构进一步通过 X 射线晶体学分析确定。

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