Organolanthanide-catalyzed cyclodimerizations of disubstituted alkynes

Journal Article · Tue May 01 00:00:00 EDT 1990 · Organometallics; (USA)

DOI:https://doi.org/10.1021/om00119a023· OSTI ID:6519062

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

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1. Univ. of Groningen (Netherlands)

The lanthanide alkyls Cp{sub 2}*LnCH(SiMe{sub 3}){sub 2} (Ln = La, Ce) are efficient catalysts for the cyclodimerization of 2-alkynes MeC{triple bond}Cr (R = Me, Et, n-Pr) to 1,2-disubstituted 3-alkylidenecyclobutenes. The first step in the reaction is a propargylic metalation of the {alpha}-methyl group, giving Cp*{sub 2}LnCH{sub 2}C{triple bond}CR compounds and free CH{sub 2}(SiMe{sub 3}){sub 2}.

• OSTI ID: 6519062
• Journal Information: Organometallics; (USA), Journal Name: Organometallics; (USA) Vol. 9:5; ISSN 0276-7333; ISSN ORGND
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKYNES
CATALYSTS
CERIUM
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
DIMERIZATION
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
LANTHANUM
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
POLYMERIZATION
RARE EARTHS