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Volumn 23, Issue 8, 2004, Pages 1766-1776

Synthesis and Properties of Iridium Bis(phosphinite) Pincer Complexes (p-XPCP)IrH 2, (p-XPCP)Ir(CO), (p-XPCP)Ir(H)(aryl), and {(p-XPCP)Ir}H 2{μ-N 2} and Their Relevance in Alkane Transfer Dehydrogenation

Author keywords

[No Author keywords available]

Indexed keywords

ALKANE TRANSFER DEHYDROGENATION; ELECTRON-RICH COMPLEXES; HETEROGENEOUS CATALYSTS;

EID: 2342434304     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om030670o     Document Type: Article
Times cited : (224)

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    • March Release
    • The dehydrogenation enthalpy of COA (23.3 kcal/mol) is among the lowest known for alkanes, which makes it an even more suitable substrate for alkane dehydrogenation: NIST Standard Reference Database Number 69, March 2003 Release, http://webbook.nist.gov/chemistry/.
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    • note
    • During review, one referee pointed out that complexes 7 are probably not Ir(V) tetrahydrides but rather Ir(III) dihydride/dihydrogen adducts. We totally agree, on the basis of the observations made for the Ir(III) dihydride complexes 6: These complexes already exhibit (nonclassical) dihydrogen binding character (and likewise Ir(I) character) due to the substantial VHD coupling constants in their 6-di isotopomers (vide infra). However, for the sake of simplicity and the lack of hard experimental evidence we will refer to complexes 7 in a "stoichiometric" way as tetrahydrides. A more detailed discussion of the binding mode in the dihydride complexes 6 will be published elsewhere,
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    • note
    • 2}IrHCl with hydrogen and 1.1 equiv of NaOtBu in analogy with the procedures described here.
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    • The hydridochloro precursors 4a-f exhibit hydridio resonances between -40.9 and -41.9 ppm. In addition an X-ray structure analysis of 4a indicates that the hydride occupies the apical position; see ref 16.
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    • note
    • The elemental analysis probably reflects the partial loss of toluene from compound 11f.


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