atmosphere (Ar) glovebox or using standard Schlenk techniques (N2). All reaction solvents were dried and deoxygenated using
an Innovative Technology PS-MD-4 solvent purification system and stored
over activated 3 Å molecular sieves. DMEDA (98%), DEEDA (95%),
and tungsten(VI) chloride (99.9%) were purchased from Sigma-Aldrich
and purified. WCl4(DME) (DME = dimethoxyethane) was synthesized
using a previously reported procedure in the literature.26 (link) The 1H and 13C NMR spectra
were recorded using a Bruker Advance NEO 500 MHz FT-NMR spectrometer.
All samples for the NMR spectra were sealed in an NMR tube containing
C6D6 as internal standards inside the Ar atmosphere
glovebox. The Fourier-transform infrared (FT-IR) spectra were obtained
using a Shimadzu IRSpirit FT-IR spectrophotometer. Samples were prepared
within the glovebox using pellets with KBr. Elemental analysis was
performed using a Thermo Scientific FLASH EA-2000 organic elemental
analyzer.