Christof Troeltzsch, Bliesenrader Weg 5, Born/Darss, Germany Journal of Unsolved Questions, 2, 1, Open Questions, 3, 2011 (Received November 3rd 2011, accepted November 25th 2011, published December 3rd 2012) While working on the doctoral thesis about chelates of zirconium and hafnium – cf. [1] for preparation of the ligands and [2] for preparation of the … Continue reading Which Intermediate Product Causes the Blue Colouring in a Grignard Reaction Involving Zirconium Chelates?