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Investigation of intermetallic communication in novel bimetallic catalysts using cyclic voltammetry: a thesis submitted in partial fulfilment of the requirements for the degree of Masters of Research

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thesis
posted on 28.03.2022, 12:23 authored by Raphael Hoikin Lam
The first part of this thesis describes the intermolecular hydroalkoxylation of terminal alkynes catalysed by [Rh(CO)₂Phdpm] (18), affording enol ethers with high yield and selectivity. The reactions proceed with optimum conversion and selectivity in the absence of moisture and oxygen and tolerate a range of substituted aryl and allyl acetylene substrates, but do not proceed with internal alkynes. The redox behaviour of complexes 18 and [Rh(CO)₂bpm]BArF₄ (19), probed using cyclic voltammetry, indicate the reaction may proceed via formation of a vinylidene intermediate. In the second part, two novel bimetallic complexes with heteroditopic ligands (16 with bpm/mim motifs; 17 with dpm/mim motifs) were synthesised and characterised. These were tested as catalysts for the intermolecular hydroalkoxylation of phenylacetylene with methanol, and the intramolecular dihydroalkoxylation of alkyne diols 11 and 23. Compared to analogous monometallic complexes, 17 exhibited cooperative rate enhancement in the intermolecular hydroalkoxylation reaction; and both 16 and 17 displayed rate inhibition in the intramolecular dihydroalkoxylation. The redox potentials of 16 and 17, and 10 were compared to those of 18, 19 and [Rh(CO)₂Phmim]BArF₄ (13a). Evidence supports a rate limiting vinylidene formation step for the intermolecular hydroalkoxylation reaction.

History

Table of Contents

1. Introduction -- 2. Catalysed intermolecular iydroalkoxylation reaction using a monometallic Rh(I) catalyst -- 3. Heteroditopic ligands and their Dirhodium complexes : synthesis and catalysis -- 4. Conclusions and future work.

Notes

Empirical thesis. Bibliography: pages R1-R3

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Degree

MRes, Macquarie University, Faculty of Science and Engineering, Department of Chemistry and Biomolecular Sciences

Department, Centre or School

Department of Chemistry and Biomolecular Sciences

Year of Award

2015

Principal Supervisor

Barbara Messerle

Rights

Copyright Raphael Hoikin Lam 2015. Copyright disclaimer: http://www.copyright.mq.edu.au

Language

English

Extent

1 online resource (xii, 55. 3, 12 pages) diagrams, graphs, tables

Former Identifiers

mq:44899 http://hdl.handle.net/1959.14/1073063