Propane, 2,2-dimethyl-, magnesium

QHioOj, Propanoic acid, 2,2-dimethyl-, tungsten complex, 26 223 C, H, Propane, 2,2-dimethyl-, magnesium and tungsten complexes, 26 46, 47, SO C,H N, Ethanamine, N-ethyl-N-methyl-, tungsten complex, 26 40, 42 C HF, Benzene, pentanuoro-, gold complexes, 26 86-90... 

The organic fractions are combined and washed successively with N,N-dimethyl-1,3-propane-diamine, dilute hydrochloric acid, saturated sodium bicarbonate solution and saturated sodium chloride solution. The organic fraction is dried over anhydrous magnesium sulfate. The solvent is then evaporated off. Upon trituration of the residue with methanol, a solid crystallizes, 5-(p-toluovl)-1 -methvlpvrrole-2-acetonitrile, which is removed by filtration and purified by recrystallization from benzene. 

Alkaline-earth alkoxides are insoluble and involatile in contrast to the double alkoxides formed by dissolving the alkaline earth metal in a solution of niobium or tantalum isopropoxide in propan-2-ol. With the exception of the magnesium derivative which decomposes on heating, they can be sublimed in vacuo, thermal stability diminishing in the order Ba > Sr > Ca. The calcium and strontium derivatives are monomeric in refluxing benzene, the others are insoluble. Attempts to elucidate structures by n.m.r. spectroscopy were foiled by the rapid exchange of geminal dimethyl protons (see also p. 66). 

---