PHYSICOCHEMICAL PROPERTIES OF ALKOXIDES REGULARITIES IN THE HOMOLOGOUS SERIES

PHYSICOCHEMICAL PROPERTIES OF ALKOXIDES REGULARITIES IN THE HOMOLOGOUS SERIES 

General considerations lead then to the following conclusion the increase in the ramification of the radical should promote the solubility in organic solvents, especially the nonpolar ones, while the numeric data on this topic are quite rare and often contradictory in literature. For reasons for this situation see, Chapter 6. 

The state of the alkoxides in the gas phase appears important in connection with their purification. The mass-spectra of the volatile species indicate the existence of aggregates, whose size is usually corresponds to that established for the solid phase by the X-ray single crystal studies [952, 1655]. It is, however, important to take into consideration the fact that the distillation is in some cases accompanied by ether elimination reaction and formation of oxoalkox-ides  

A special case is represented by the MO(OR)4, M=Mo, W oxoalkoxides, which in analogy with the corresponding oxide halides undergo disproportionation in the gas phase  

Therefore, in spite of the identical microanalysis data for the initial product and the destilled one, the X-ray powder diffraction indicates the presence of the admixture phases in the latter [950,968]. Details of the physicochemical characteristics of different derivatives are provided in Chapter 12. They are also described in the review part of the book by Bradley et al. [223]. 

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