TY - JOUR AU - Langhals, H; Jona, W JO - Angew. Chem. Int. Ed. VL - 37 PY - 1998 DO - 10.1002/(SICI)1521-3773(19980420)37:7<952::AID-ANIE952>3.0.CO;2-4 SP - 952 N1 - ; Angew. Chem.1998, 110, 998 ER -