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001-es BibID:	BIBFORM102187
035-os BibID:	(Wos)000180842300029 (Scopus)0037991154
Első szerző:	Navarro, Janeth
Cím:	Unusual 1-Alkyne Dimerization/Hydrogenation Sequences Catalyzed by [Ir(H)2(NCCH3)3(P-i-Pr3)]BF4: Evidence for Homogeneous-Like Mechanism in Imidazolium Salts / Janeth Navarro, Mária Sági, Eduardo Sola, Fernando J. Lahoz, Isabel T. Dobrinovitch, Ágnes Kathó, Ferenc Joó, Luis A. Oro
Dátum:	2003
ISSN:	1615-4150
Megjegyzések:	Abstract: The reaction of complex [Ir(H)2(NCCH3)3(P-i-Pr3)]BF4 (1) with excess of 1- alkynes such as t-BuC CH and PhC CH gave the butadiene compounds Ir[ 4 -(R)2C4H4](NCCH3)2(P-i Pr3)}BF4 (R t-Bu, 5; R Ph, 6). Compound 5 was obtained as a single isomer containing a 1,3-disub stituted butadiene ligand, whereas 6 was formed as a 7:1 mixture of isomers containing 1,3- and 1,4- disubstituted butadienes, respectively. Spectroscopic observations showed alkenyl hydride reaction inter mediates, consistent with a double insertion/C-C coupling sequence. Complexes 5 and 6 were found to react with dihydrogen to give 1 and alkenes resulting from the partial hydrogenation of the butadiene moieties. This dimerization/hydrogenation sequence has been found to be the major reaction of t-BuC CH under conditions of homogeneous hydro genation whereas that of PhC CH produced styrene and ethylbenzene as major products. Similar selectiv ity was observed for these hydrogenations using organic/ionic liquid biphasic conditions with toluene/ BMIM ? BF4, suggesting reaction mechanisms similar to those operating under homogeneous conditions. This conclusion is also supported by the spectroscopic observation of alkenyl hydride intermediates during the formation of 6 in BMIM BF4 as solvent.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk alkynes biphasic catalysis homogeneous catalysis hydrogenation ionic liquids, iridium
Megjelenés:	Advanced Synthesis & Catalysis. - 345 : 12 (2003), p. 280-288. -
További szerzők:	Sági Mária Sola, Eduardo Lahoz, Fernando J. Dobrinovitch, Isabel T. Kathó Ágnes (1954-) (vegyész, kémikus) Joó Ferenc (1949-) (vegyész) Oro, Luis A.
Pályázati támogatás:	2001HU0006 MTA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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