TY - JOUR AU - Freudendahl, D M; Santoro, S; Shahzad, S A; Santi, C; Wirth, T JO - Angew. Chem. Int. Ed. VL - 48 PY - 2009 DO - 10.1002/anie.200903893 L3 - PubMed-ID: 19802863 SP - 8409 ER -