The significance of phosphoniocarbynes in halocarbyne cross-coupling reactions

Competent intermediates in palladium(0)-copper( i ) mediated catalytic cross coupling reactions of the bromocarbyne complex [W(&z.tbd;CBr)(CO) 2 (Tp*)] (Tp* = hydrotris(dimethylpyrazolyl)borate) have been isolated however heterobimetallic phosphoniocarbyne complexes [WPd(μ-CPPh 3 )Br(CO) 2 (PPh...

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Published inChemical communications (Cambridge, England) Vol. 56; no. 42; pp. 5673 - 5676
Main Authors Burt, Liam K, Cordiner, Richard L, Hill, Anthony F, Manzano, Richard A, Wagler, Jörg
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 27.05.2020
Subjects
Carbon monoxide
Chemical reactions
Cross coupling
Crystallography
Palladium
Tangents
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Summary:Competent intermediates in palladium(0)-copper( i ) mediated catalytic cross coupling reactions of the bromocarbyne complex [W(&z.tbd;CBr)(CO) 2 (Tp*)] (Tp* = hydrotris(dimethylpyrazolyl)borate) have been isolated however heterobimetallic phosphoniocarbyne complexes [WPd(μ-CPPh 3 )Br(CO) 2 (PPh 3 ) x (Tp*)] are identified as productive ( x = 1) or non-productive ( x = 0) tangents to the catalytic cycle. Competent intermediates as well as productive and non-productive tangents have been identified in the catalytic cycle for palladium(0)-copper( i ) mediated synthesis of propargylidynes via cross coupling reactions of bromocarbyne complexes with alkynes.
Bibliography:For ESI and crystallographic data in CIF or other electronic format see DOI
1988587-1988594
Electronic supplementary information (ESI) available: Synthetic procedures, spectroscopic and crystallographic data. CCDC
10.1039/d0cc02070b
ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1359-7345
1364-548X
DOI:10.1039/d0cc02070b