Mono- and Bimetallic Alkynyl Metallocenes and Half-Sandwich Complexes: A Simple and Versatile Synthetic Approach

• Published in: Chemistry : a European journal Vol. 22; no. 44; pp. 15645 - 15649
• Main Authors: Valderas, Carolina, Marzo, Leyre, de la Torre, María C., García Ruano, José Luis, Alemán, José, Casarrubios, Luis, Sierra, Miguel A.
• Format: Journal Article
• Language: English
• Published: Germany Blackwell Publishing Ltd 24-10-2016; Wiley Subscription Services, Inc
• Subjects: acetylene sulfones; Alkynes; anti-Michael addition; Bimetals; Chemistry; Derivatives; Electrochemical analysis; half-sandwich complexes; Lithium; Metallocenes; Synthesis; Synthesis (chemistry); half-sandwich complexes; anti-Michael addition; acetylene sulfones; metallocenes
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.201603462

A general process for the synthesis of alkynyl mono and dimetallic metallocenes and half‐sandwich complexes has been developed. This approach uses the addition of lithium derivatives of sandwich or half‐sandwich complexes to arylsulfonylacetylenes. The reaction occurs in two steps (lithiation and anti‐Michael addition to alkynylsulfone followed by elimination of the ArSO2 moiety) to form the corresponding mono‐ or bimetallic alkynes in clearly higher yields, simpler experimental procedures, and more environmentally benign conditions than those of the so far reported for the synthesis of this type of products. The electrochemical properties of the newly obtained complexes have also been studied.
Alkynyl sandwiches: A general process for the synthesis of alkynyl mono‐ and dimetallic metallocenes and half‐sandwich complexes has been developed. This approach uses the addition of lithium derivatives of sandwich or half‐sandwich complexes and arylsulfonylacetylenes.