S-20 Synergy of Reaction Chemistry and Structural Chemistry   S20-1. In Situ Crystallographic Observation of Highly Selective Organic Reactions in Supramolecules   S20-2. NMR Spectroscopic Analyses of Anionic Reactive Intermediates   S20-3. Preparation of Sterically Demanded Phosphines via Haloarenemetal Complexes   S20-4. Homo- versus Heterometallic Bases for Directed Aromatic Metallation; Structural and Mechanistic Insights   S20-5. Structural Chemistry and Organic Reactions of Ate Complexes: A Heterobimetallic Chemistry   S20-6. Cold-Spray Ionization Mass Spectromety for Labile Organic Compounds