General Methods.'H NMR spectra were determined on a Nicolet NT 360WB spectrometer as solutions in CDCl,. Chemical shifts are reported in parts per million dodield from the internal reference tetramethylsilane. Couplings (J) are in hertz. Reactions were carried out under an atmosphere of dry nitrogen. Neopentyllithium was prepared as a 0.48 M solution by treating excess lithium powder with neopentyl chloride in hexane. Vinyllithium (Orgmet) and all ...
