Reversible carbon-carbon bond formation in organolanthanide systems. Preparation and properties of lanthanide acetylides [Cp*{sub 2}LnC{triple_bond}CR]{sub n} and their rearrangement products [Cp*{sub 2}Ln]{sub 2}({mu}-{eta}{sup 2}:{eta}{sup 2}-RC{sub 4}R) (Ln = La, Ce, R = Alkyl)

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Organometallics

DOI:https://doi.org/10.1021/om00031a035· OSTI ID:433548

Heeres, H J; Nijhoff, J; Teuben, J H ^[1]

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1. Univ. of Groningen (Netherlands); and others

Lanthanide carbyls Cp*{sub 2}LnCH(SiMe{sub 3}){sub 2}{sup 1} (1, Ln=Ce;2, Ln=La) react with terminal alkynes HC{triple_bond}CR (R = Me, t-Bu) to yield oligomeric acetylides [Cp*{sub 2}LnC{triple_bond}CR]{sub n} (3, Ln = Ce, R = Me; 4, Ln = La, R = Me; 5, Ln = Ce, R = t-Bu). The acetylides are not stable in solution and rearrange to give the carbon-carbon coupled products, [Cp*{sub 2}Ln]{sub 2}({mu}-{eta}{sup 2}:{eta}{sup 2}-RC{sub 4}R) (6, Ln = Ce, R = Me; 7, Ln = La, R = Me; 8, Ln = Ce, R = t-Bu). Thermodynamic and kinetic studies of the C-C coupling process were studied as were the structures of 6 and 8 via XRD.

• Sponsoring Organization: USDOE
• OSTI ID: 433548
• Journal Information: Organometallics, Journal Name: Organometallics Journal Issue: 7 Vol. 12; ISSN 0276-7333; ISSN ORGND7
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ALKYNES
CERIUM COMPLEXES
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
LANTHANUM COMPLEXES
ORGANOMETALLIC COMPOUNDS
X-RAY DIFFRACTION