Supporting information for Studies Directed Toward the Construction of the Polypropionate Fragment of Superstolide A Joan G. Solsona, Pedro Romea, Fèlix Urpí S1 Supporting information for: Studies Directed Toward the Construction of the Polypropionate Fragment of Superstolide A Joan G. Solsona, Pedro Romea,* Fèlix Urpí* Experimental procedures and characterization data for compounds 2, 4, 5, and 8–17. Melting points were taken on an Electrothermal apparatus and have not been corrected. Specific rotations were determined at 20 °C on a Perkin-Elmer 241 MC polarimeter. IR spectra were recorded on either a Perkin-Elmer 681 or a Nicolet 510 FT spectrometer and only the more representative frequencies (cm –1 ) are reported. 1 H NMR (300 MHz) and 13 C NMR (75.4 MHz) spectra were recorded on a Varian Unity Plus 300 spectrometer; 1 H NMR (400 MHz) and 13 C NMR (100.6 MHz) spectra were recorded on a Varian Mercury-400 spectrometer; 1 H NMR (500 MHz) spectra were recorded in a Varian Inova-500 spectrometer. Chemical shifts (δ) are quoted in ppm and referenced to internal TMS for 1 H NMR and CDCl 3 (δ 77.0) or CD 3 OD (δ 49.0) for 13 C NMR; coupling constants (J) are quoted in Hz; data are reported as follows: s, singlet; d, doublet; t, triplet; q, quartet; m, multiplet; br, broad; where appropriate, 2D techniques were also used to assist in structure elucidation. High resolution mass spectra (HRMS) were obtained from the Centro de Apoio Cientifico Tecnoloxico a Investigacion (C.A.C.T.I.), Universidad de Vigo. HPLC analyses were performed on a Shimadzu Liquid Chromatograph (Tracer Spehrisorb S3W column, 4.6 mm × 25 cm, 3 μm silica gel, 0.9 mL min –1 ). Flash chromatography was performed on SDS silica gel 60 (35–70 μm). Analytical thin-layer chromatography was carried out on Merck Kieselgel 60 F 254 plates. All reactions were conducted in oven-dried glassware under inert atmosphere of dry argon or nitrogen with anhydrous solvents. The solvents and reagents were purified and dried according to standard procedures.