Dataset for organic synthesis and characterisation of compounds in the manuscript entitled "Highly Non-Linear Transport Across Single-Molecule Junctions due to Destructive Quantum Interference" The data are as follows: 1H and 13C NMR - Data can be opened with TopSpin software which can be downloaded from Bruker (free for academic license) Cyclic Voltammetry - Text (.txt) files can be opened using text editor software such as Notepad or Wordpad. Average value of the half-wave potentials of ferrocene scans was used to reference the potentials. DSC (Differential Scanning Calorimetry) - Comma Separated Value files (.csv) can be opened using text editor software such as Notepad or Spreadsheet software such as Microsoft Excel. Elemental Analysis - Scanned copies of elemental analysis from analysis service at University of Glasgow and University of Strathclyde. PDF Files an be opened using PDF reader software such as Adobe Acrobat Reader. Fluorescence - Text files can be opened using text editor software such as Notepad or Wordpad. Mass Spectrometry - Scanned copies of spectra from mass spectrometry analysis service at University of Glasgow and University of Strathclyde. PDF files can be opened using PDF (.pdf) reader software such as Adobe Acrobat Reader. PNG (.png) files can be opened using Image viewer software such as Microsoft Photos. TGA (Thermogravimetric Analysis) - Comma Separated Value files (.csv) can be opened using text editor software such as Notepad or Microsoft Excel software. Text (.txt) files can be opened using text editor software such as Notepad or Wordpad. UVVis Absorption - Text files can be opened using text editor software such as Notepad or Wordpad. Final Compounds 1, 2, 3 and C1 are characterised using all of the methods listed above. Intermediate compounds that have not been previously reported in literature (Compounds 6 and 7) are characterised using 1H NMR, 13C NMR, mass spectrometry and elemental analysis. UV-treated 1-bromonapthalene was studied using UVVis absorption. Reaction of UV-treated 1-bromonaphthalene with triethylamine to form triethylamine hydrobromide was characterised using 1H and 13C NMR and mass spectrometry.