首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Diastereocontrolled synthesis of cis-olefins by selective C-C bond formation between alkyl and alkynyl groups coordinated to 'Ir (CH = CHPPh_3)(CO)(PPh_3)_2'
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Diastereocontrolled synthesis of cis-olefins by selective C-C bond formation between alkyl and alkynyl groups coordinated to 'Ir (CH = CHPPh_3)(CO)(PPh_3)_2'

机译:通过与“ Ir(CH = CHPPh_3)(CO)(PPh_3)_2”配位的烷基和炔基之间的选择性C-C键形成,非对映控制合成顺式烯烃

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摘要

cis, cis-1,4-Dipropenylbenzene (cis, cis-p-C_6H_4 (CH = CHCH_3)_2, cis-DPB) and cis,cis, cis-1,3,5-tripropenylbenzene (cis, cis, cis-m,m-C_6H_3 (CH = CHCH_3)_3, cis-TPB) are obtained in high yields by reactions of di-and tri-nuclear alkyl-alkenyl-alkynyl iridium (III) compounds, [p-C_6H_4 (C ident to C - Ir(CH_3)(CH = CHPPh_3)(CO) (PPh_3)_2)_2]~(2+) 1 and [m,m-C_6H_3 (C ident to C - Ir (CH_3) (CH = CHPPh_3)(CO)(PPh_3)_2)_3]~(3+) 3 with HCl. The reaction of the mono-nuclear alkyl-alkenyl-alkynyl iridium (III) complex, [Ir(CH_3)(CH = CHPPh_3(C ident to C-p-C_6H_4CH_3)(CO)(PPh_3)_2]~+ 7a with DCl selectively gives cis-CD_3CD = CD (p-C_6H_4CH_3) 8a-d_5 while to isomers, cis-C_6H_4CD_2CD = CD(p-C_6H_4CH_3)8b-d_4 and cis-C_6H_5CD = CDCD_2(p-C_6H_4CH_3)8b'-d_4 are obtained from the reaction of [Ir(CH_2Ph)(CH = CHPPh_3)-(C = C-p-C_6H_4CH_3)(CO)(PPh_3)_2]~+ 7b with DCl. Plausible reaction pathways containing the initial attack of H~+ on the beta-carbon of the alkynyl ligands to produce cis-alkenyl complexes that give eta~2- allene complexes are suggested for the selective and diastereocontrolled C-C bond forming reactions between alkyl and alkynyl groups to give cis-olefins, 8, cis-DPB, and cis-TPB.
机译:顺式,顺式-1,4-二丙烯基苯(顺式,顺式-p-C_6H_4(CH = CHCH_3)_2,顺式-DPB)和顺式,顺式,顺式-1,3,5-三丙烯基苯(顺式,顺式,顺式-m ,m-C_6H_3(CH = CHCH_3)_3,顺式-TPB)是通过二和三核烷基-烯基-炔基铱(III)化合物[p-C_6H_4(C等同于C- Ir(CH_3)(CH = CHPPh_3)(CO)(PPh_3)_2)_2]〜(2+)1和[m,m-C_6H_3(C等同于C-Ir(CH_3)(CH = CHPPh_3)(CO) (PPh_3)_2)_3]〜(3+)3与HCl混合。单核烷基-烯基-炔基铱(III)络合物[Ir(CH_3)(CH = CHPPh_3(C等同于Cp-C_6H_4CH_3)(CO)(PPh_3)_2]〜+ 7a与DCl的反应) cis-CD_3CD = CD(p-C_6H_4CH_3)8a-d_5而对于异构体,cis-C_6H_4CD_2CD = CD(p-C_6H_4CH_3)8b-d_4和cis-C_6H_5CD = CDCD_2(p-C_6H_4CH_d从反应4得到)8b [Ir(CH_2Ph)(CH = CHPPh_3)-(C = Cp-C_6H_4CH_3)(CO)(PPh_3)_2]〜+ 7b与DC1的关系。包含H〜+初始攻击C3的β-碳的合理反应途径建议将炔基配体产生顺式-烯基配合物,该顺式-烯基配合物产生η2-丙二烯配合物,用于烷基和炔基之间的选择性和非对映控制的CC键形成反应,以产生顺式烯烃,8,顺式-DPB和顺式-TPB。

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