New iridacyclohexadienes and iridabenzenes by [2+2+1] cyclotrimerization of alkynes and facile interconversion between iridacyclohexadienes and iridabenzenes

Chemistry : a European Journal
Chong Shik Chin, Hyungeui Lee

Abstract

Iridabenzenes [Ir[=CHCH=CHCH=C(CH2R)](CH3CN)2(PPh3)2]2+ (R=Ph 4 a, R=p-C6H4CH3 4 b) are obtained from the reactions of H+ with iridacyclohexadienes [Ir[-CH=CHCH=CHC(=CH-p-C6H4R')](CO)(PPh3)2]+ (R'=H 3 a, R'=CH3 3 b), which are prepared from [2+2+1] cyclotrimerization of alkynes in the reactions of [Ir(CH3CN)(CO)(PPh3)2]+ with HC[triple chemical bond]CH and HC[triple chemical bond]CR. Iridabenzenes 4 react with CO and CH3CN in the presence of NEt3 to give iridacyclohexadienes [Ir[-CH=CHCH=CHC(=CHR)](CO)2(PPh3)2]+ (6) and [Ir[-CH=CHCH=CHC(=CHR)](CH3CN)2(PPh3)2]+ (7), respectively. Iridacyclohexadienes 6 and 7 also convert to iridabenzenes 4 by the reactions with H+ in the presence of CH3CN. Alkynyl iridacyclohexadienes [Ir[-CH=CHCH=CHC(=CH-p-C6H4R')](-C[triple chemical bond]CH)(PPh3)2] (8) undergo a cleavage of C[triple chemical bond]C bond by H+/H2O to produce [Ir[-CH=CHCH=CHC(=CH-p-C6H4R')](-CH3)(CO)(PPh3)2] (10) via facile inter-conversion between iridacyclohexadienes and iridabenzenes.

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Citations

Jun 21, 2011·Angewandte Chemie·Jiangxi ChenGuochen Jia
Mar 17, 2010·Angewandte Chemie·Ka Chun PoonGuochen Jia
May 25, 2006·Angewandte Chemie·Christopher W Landorf, Michael M Haley
Oct 26, 2007·Angewandte Chemie·Guomei HeGuochen Jia
May 8, 2009·Chemistry : a European Journal·Lei GongHaiping Xia
Dec 3, 2005·Angewandte Chemie·Eleuterio AlvarezNuria Rendón
Apr 6, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·L James Wright
Mar 28, 2006·Angewandte Chemie·Hong ZhangGuochen Jia
May 31, 2012·Chemistry, an Asian Journal·Ran LinHaiping Xia
Nov 22, 2014·Chemistry : a European Journal·Feifei HanHaiping Xia
Aug 19, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Chuan ShiGuochen Jia
Sep 16, 2011·Angewandte Chemie·Jiangxi ChenGuochen Jia
Dec 2, 2017·Chemistry : a European Journal·Benjamin J Frogley, L James Wright
Mar 2, 2011·Chemistry : a European Journal·Ran LinHaiping Xia
Nov 9, 2012·Chemistry, an Asian Journal·Qianyi ZhaoHaiping Xia
Sep 19, 2012·Chemistry : a European Journal·Jiangxi ChenGuochen Jia
Sep 16, 2014·Chemistry : a European Journal·Ran LinGuochen Jia
Aug 15, 2012·Chemistry : a European Journal·Qianyi ZhaoHaiping Xia
Oct 15, 2011·Journal of the American Chemical Society·Wai Yiu HungGuochen Jia
Oct 20, 2020·Chemical Reviews·Dafa ChenHaiping Xia
Oct 19, 2006·Journal of the American Chemical Society·Wai Yiu HungGuochen Jia

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