General Consideration. All manipulations were carried out using standard Schlenk line or dry-box techniques under an atmosphere of argon. Solvents were dried over sodium benzophenone ketyl or calcium hydride (n-hexane, chloroform), degasses and stored over activated molecular sieves or K mirror. Nuclear magnetic resonance (NMR) spectra were recorded on a Jeol 400 spectrometer, at ambient temperature unless otherwise noted. Mass spectra were performed at the UC San Diego Mass Spectrometry Laboratory on an Agilent 6230 Accurate-Mass TOFMS spectrometer. Single crystal X-ray diffraction data were collected on Bruker Apex diffractometers using Mo-Kα radiation (λ = 0.71073 Å) or Cu-Kα radiation (λ = 1.54178 Å) at the UC San Diego Crystallography Facility.