Early Transition Metal Complexes Containing Sterically Demanding Ligands

为了合成具有空间要求配体的低价早期过渡金属配合物ArMMAr (M = Mo， W)，与卤化物进行了不成功的转金属反应。因此，研究了钼羧酸盐作为起始原料，得到了配合物1 （Mo2(OOCPh)3Ar', Ar' = 2,6- dipp - c6h3）和2(Mo2(OOCTol)3(OC(t-Bu)3)2Li)，但仍有一些有前途的反应产物有待表征。为了比较，将进行与钨和混合金属羧酸盐的类似反应。不同的起始材料([Mo2(NCCH3)8]4+, Mo2（NMe2)6, Mo2(OR)6）以及与类似钨材料的反应也将被研究。我们将尝试合成与ArMMAr型6族化合物等值的钒化合物。因此，在与V(CO)6和VCl2 * n THF以及与VCl2 * n THF的反应中，碳烯将被用作配体，而与VCl2 * n THF的反应将会进行更多的反应。当目标分子ArMMAr的合成完成后，将对其对一系列小分子的反应性进行研究。

To synthesize low valent early transition metal complexes ArMMAr (M = Mo, W) with sterically demanding ligands, transmetalation reactions with halogenides were unsuccessful. For that reason molybdenum carboxylates were investigated as starting materials and the complexes 1 (Mo2(OOCPh)3Ar', Ar' = 2,6-Dipp-C6H3) and 2 (Mo2(OOCTol)3(OC(t-Bu)3)2Li) could be obtained, but there are few more products of promising reactions that still have to be characterized. For comparison analogous reactions with tungsten and mixed metal carboxylates will be performed. Different starting materials ([Mo2(NCCH3)8]4+, Mo2(NMe2)6, Mo2(OR)6) will also be investigated as well as reactions with analgous tungsten materials. It will be attempted to synthesize vanadium compounds that are isolobal to group 6 compounds of the type ArMMAr. Therefore carbenes will be used as ligands in reactions with V(CO)6 and VCl2 * n THF and with VCl2 * n THF as educt more reactions will be performed. When the synthesis of the target molecules ArMMAr have been achieved, their reactivity toward a wide array of small molecules will be investigated.