0 ppm 13 C). EI mass spectra were recorded on a JMS-SX102A spectrometer. FAB mass spectra were recorded on a JMS-HX110A spectrometer. Infrared spectra were recorded on a Shimadzu FTIR-8100 spectrophotometer. Gel permeation chromatography was carried out with Japan Analytical Industry LC-918. Unless otherwise noted, all materials were obtained from commercial suppliers and used without further purification. Diethyl ether (Et 2 O) and tetrahydrofuran (THF) were freshly distilled under argon from sodium benzophenone ketyl prior to use. 2-Pyridyltrimethylsilane was prepared according to the literature procedures. 1 [2-(2-Pyridyl)ethyl]tributyltin was prepared according to the literature procedures. 2