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• W2006122725 endingPage "2091" @default.
• W2006122725 startingPage "2078" @default.
• W2006122725 abstract "The non-heteroatom-substituted alkynyl carbene Cp′(CO)2Mn═C(Tol)C≡CPh (1, Cp′ ≡ (η5-MeC5H4)) is first shown to react at low temperature with lithium diorganophosphide LiPR2 (R = Ph, Cy) to form an anionic species. Subsequent treatment with CF3SO3H affords the η4-vinylketene complex Cp′(CO)2Mn[η4-{R2P(Ph)C═CHC(Tol)═C═O}] (2; 2a: R = Ph (70% yield), 2b: R = Cy (55% yield)) as the major compound, along with trace amounts of the η2-allene complex syn-Cp′(CO)2Mn[η2-{Ph2P(Tol)C═C═C(Ph)H}] (syn-3a) for R = Ph, or along with the η2-allene complex Cp′(CO)2Mn[η2-{H(Tol)C═C═C(Ph)PCy2}] (4b, 26% yield, 1:2 mixture of syn/anti isomers) for R = Cy. On the other hand, subsequent treatment with NH4Claq affords only η2-allene complexes, obtained either as a ca. 1:9 mixture of syn-3a and Cp′(CO)2Mn[η2-{H(Tol)C═C═C(Ph)PPh2}] (4a) (75% yield) for R = Ph or as a 1:2 mixture of syn- and anti-4b for R = Cy (74% yield). Combined NMR and single-crystal X-ray diffraction studies (for 2a, anti-4b, and syn-4b) revealed that both type 2 and type 4 species result from a nucleophilic attack of the diorganophosphide onto the remote alkynyl carbon atom in 1 (Cγ), whereas type 3 species results from a nucleophilic attack of the carbene carbon atom (Cα). Complexes 3a and 4a,b are prone to undergo a thermal rearrangement to give the η1-phosphinoallene complexes Cp′(CO)2Mn[η1-{Ph2P(Tol)C═C═C(Ph)H}] (5a) and Cp′(CO)2Mn[η1-{R2P(Ph)C═C═C(Tol)H}] (6; 6a: R = Ph, 6b: R = Cy), respectively. Reaction of 1 with p-toluenethiol in the presence of NEt3 (20%) affords a 1.8:1 mixture of Cp′(CO)2Mn[η2-{TolS(Tol)C═C═C(Ph)H}] (syn-11), resulting from a nucleophilic attack at Cα in 1, and Cp′(CO)2Mn[η2-{H(Tol)C═C═C(Ph)STol}] (12), resulting from a nucleophilic attack at Cγ, whereas treatment of 1 with lithium p-toluenethiolate at –80 °C followed by protonation with NH4Claq gave the same syn-11 and 12 complexes now in a 1:2.3 ratio. Finally, 1 was found to react with cyclohexanone lithium enolate to afford, upon protonation, the η2-allene complex Cp′(CO)2Mn[η2-{H(Tol)C═C═C(Ph)CH(CH2)4C(O)}] (syn-13), resulting from a nucleophilic attack at Cγ in 1. The solid-state structures of syn-11 and syn-13 are also reported." @default.
• W2006122725 created "2016-06-24" @default.
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• W2006122725 creator A5073008066 @default.
• W2006122725 date "2008-04-09" @default.
• W2006122725 modified "2023-10-10" @default.
• W2006122725 title "Directed Formation of Allene Complexes upon Reaction of Non-heteroatom-Substituted Manganese Alkynyl Carbene Complexes with Nucleophiles" @default.
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• W2006122725 doi "https://doi.org/10.1021/om800060v" @default.
• W2006122725 hasPublicationYear "2008" @default.
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