<p dir="ltr">This dataset includes all general experimental and compound characterizations for two projects, namely the "Inter- and intramolecular (4+3) cycloadditions of epoxy allylsilanes as dienophiles" and "A Practical and mild Peterson Olefination protocol using copper(II) chloride dihydrate". <br>-Chapter 2: Intermolecular (4+3) cycloadditions with epoxy allylsilanes as dienophiles. NMR spectra of all isolated compounds listed in Chapter 2 are included.</p><p dir="ltr">-Chapter 3: Intramolecular (4+3) cycloadditions with epoxy allylsilanes as dienophiles. NMR spectra of all isolated compounds listed in Chapter 3 are included. HPLC chromatograms for the asymmetric (4+3) cycloadditions are also included. <br>-Chapter 4: Practical and mild Peterson Olefination protocol using copper (II) dihydrate. NMR spectra of all isolated compounds listed in Chapter 4 are included. </p><p dir="ltr">-The general experimental for chapter 2, 3, and 4 are complied into a single file, with all compound characterizations (R<sub>f</sub> values, IR, <sup>1</sup>H-NMR, <sup>13</sup>C-NMR, HRMS) for chapter 2, 3, and 4 are included.</p>