S1 Catalytic Asymmetric Heterodimerization of Ketenes. Ahmad A. Ibrahim, Divya Nalla, Maxwell Van Raaphorst and Nessan J. Kerrigan.* Department of Chemistry, Oakland University, 2200 N. Squirrel Road, Rochester, MI 48309-4477, USA. NMR and HPLC spectra Table of Contents: HPLC of (R,Z)-3a S4 HPLC of (S,Z)-3a S5 1 H NMR of (R,Z)-3a S6 13 C NMR of (R,Z)-3a S6 1 H NMR of (S,Z)-3a S7 13 C NMR of (S,Z)-3a S7 HPLC of (R,Z)-3b S8 HPLC of (S,Z)-3b S9 1 H NMR of (R,Z)-3b S10 13 C NMR of (R,Z)-3b S10 1 H NMR of (S,Z)-3b S11 13 C NMR of (S,Z)-3b S11 1 H NMR of (R)-3c S12 13 C NMR of (R)-3c S12 1 H NMR of (S)-3c S13 13 C NMR of (S)-3c S13 HPLC of (R)-4d S14 HPLC of (S)-4d S15 1 H NMR of (R)-4d S16 13 C NMR of (R)-4d S16 1 H NMR of (S)-4d S17 13 C NMR of (S)-4d S17 HPLC of (R)-4e S18 HPLC of (S)-4e S19 1 H NMR of (R)-4e S20