臺灣博碩士論文加值系統

Boron mono- and di-cations featuring nucleophilic N-heterocyclic olefin (NHO) and pentamethylcyclopentadienyl (Cp*) substituent have been prepared and structurally characterized. Experimental and theoretical investigations show that [η5-Cp*B-NHO]2+ is considerably more Lewis acidic than [η5-Cp*B-IMes]2+ due to the steric congestion between NHO and Cp* leading much expose around the central boron atom. However, the weak interaction between NHO ligand and boron center result in the reaction product are generally unstable to isolate and characterize.

口試委員審定書
中文摘要 i
ABSTRACT ii
CONTENTS iii
LIST OF FIGURES v
LIST OF SCHEMES vi
LIST OF TABLES vii
Chapter 1. Introduction 1
1.1 Boron monocation 3
1.2 Boron dications 6
1.2.1 A Di-Substituted boron dication 8
1.3 N-Heterocyclic olefin 10
Chapter 2. Result and Discussion 14
2.1 Synthesis and characteristic of boron compound 14
2.1.1 Synthesis 14
2.1.2 NMR Characteristic of boreniums and boron dications 15
2.1.3 Crystal structure 16
2.1.4 DFT calculation study 19
2.1.5 Lewis acidity of boron cations 21
2.2 Chemical reduction of Cp*BCl2-NHO (1) 22
2.3 Reactivity studies of chloroborenium [Cp*BCl-NHO]+ ([2]+) 23
2.3.1 Frustrated Lewis pair of chloroborenium [Cp*BCl-NHO]+ ([2]+) 24
2.3.2 Reduction reaction of chloroborenium 26
2.4 Reactivity studies of boron dication [Cp*B-NHO]2+ ([3]2+) 28
2.4.1 Electronic property of boron dicaiton 29
2.4.2 Frustrated Lewis pair of boron dication 31
2.4.3 Reaction of [3][AlCl4]2 with hydride sources 32
Chapter 3. Conclusion 36
Chapter 4. Experimental Section 37
Chapter 5. Reference 51
Chapter 6. Appendix 54

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