Tan, Choon-Hong; Kobayashi, Yoshihisa; Kishi, Yoshito Angewandte Chemie - International Edition, 2000, vol. 39, # 23 p. 4282 - 4284 doi: 10.1002/1521-3773(20001201)39:23<4282::AID-ANIE4282>3.0.CO;2-U