It is a bit tricky to use, but does not require strict anhydrous conditions to the point of using a syringe or cannula. I was able to remove it from the bottle using a Pasteur pipette. Further I was able to comfortably monitor the result by C-NMR by placing my compound in CDCl3 and then adding TiCl4 before transfer to an NMR tube. I was concerned about HCl escaping from the solution in the NMR tube so I sealed the top with para-film but this proved not to be a problem. I thought a TiO2 precipitate might form which could interfere with the NMR by disturbing the homogeneity but this too turned out to be not a problem and I was able to view the signals of my start material and the product.
The Ti(IV)Cl4 complex might be breaking up by the action of water, or it may be the HCl produced by the addition of water which removes the ligands from the Ti(IV). If I could suck off the 1,2-DCE/TiCl4 in a vacuum trap I could run a crystal structure on the yellow product and determine its configuration. While I have not so far had the resources to follow this up, it may be useful to other workers.