Organomagnesium Inner Complexes, Part I. Bis(dialkylaminoalkyl)- and Bis(alkoxybutyl)magnesium Compounds
A series of magnesium inner complexes has been prepared by reacting MgH2 (prepared by homogeneous catalysis) with dialkylallyl- and -3-butenylamines and -3-butenylethers in the presence of catalytic amounts of ZrCl4.The monomeric nature of bis(4-methoxybutyl)magnesium has been confirmed by X-ray diffraction.The analogous syntheses of bis(3-alkoxypropyl)magnesium compounds failed: cleavage of the allyl ether with elimination of propene occurred.This cleavage reaction is accelerated by catalytic amounts of NiCl2 or ZrCl4. - Keywords: Magnesium, Inner Complexes, Crystal Structure, X-Ray
HYDROALUMINATION OF ALLYL ALCOHOLS AND ETHERS BY LITHIUM ALUMINUM HYDRIDE IN THE PRESENCE OF ZIRCONIUM CATALYST
Allyl alcohols and ethers were readily hydroaluminated by LiAlH4 in the presence of zirconium compounds to give organoaluminum compounds in which the aluminum atom is placed at the terminal position of the substrate.ZrCl4 was the most effective catalyst for hydroalumination of allyl alcohols, whilst Cp2ZrCl2 was more effective than ZrCl4 for allyl ethers.