524. Titanium chloride alkoxides

Abstract

described. These compounds distilled under reduced pressure without change in composition and the possibility that titanium exhibits here a covalency of 5 is considered. The new alkoxides TiCl,*OR where R = Me, Et, Pri, and Bun were readily obtained from the rapid radical-interchange reaction between the tetrachloride and the appropriate tetra-alkoxide. Certain of the titanium chloride alkoxides disproportionate when heated under reduced pressure.TITANIUM CHLORIDE ETHOXIDES have been known since 1875 when DemarCay (Compt. rend., 1875, 80, 51) reported that the reaction between titanium tetrachloride and ethanol led to the formation of a crystalline solid to which he assigned the formula TiCl(OEt),,HCl. Sixty years elapsed before the error in this formulation was pointed out and the correct fonnula TiCl,(OEt),,EtOH deduced by Jennings, Wardlaw, and Way (J., 1936, 637). In addition these authors demonstrated that in general the reaction between titanium tetrachloride and an alcohol took the course : TiC1, + 3ROH + TiCl,(OR),,ROH + 2HC1 Further it was shown that titanium monochloride triethoxide could be prepared from titanium tetraethoxide and acetyl chloride :

Organic Reaction Pathways in the Nonaqueous Synthesis of Metal Oxide Nanoparticles

“…Benzyl alcohol is coordinated to Nb centers in large amounts due to ligand exchange reactions. [216] The Scheme 3. Proposed side reaction involving a CÀC bond formation of two benzylic species to form 1,2-diphenylethanol occurring to a large extent upon solvothermal reaction of NbA C H T U N G T R E N N U N G (OEt) 5 in benzyl alcohol.…”

“…It is known that such ligand-exchange processes take place already at room temperature. [216,217] Next the alkoxy species undergo condensation to form M À O À M bonds and organic ether [Eq. (17)].…”

Fractal growth of ZrO2nanoparticles induced by synthesis conditions

“…The first pressure increase is mainly due to the VLE and additional 1-propanol that is released by a ligand exchange. Several authors have shown that the ligand exchange reaction of transition metal alkoxides in organic solvents commences already at ambient temperatures [29][30][31] and can be assumed to be completed before the reaction mixture reaches the final temperature. 32 Moreover, one can observe a slight but immediate pressure decrease after the heating period ( Fig.…”

Chemistry and Uses of Titanium Organic Compounds

“…Chlorotitanium esters are best produced, however, by the reaction of stoichiometric quantities of titanium tetrachloride with titanium esters (7,41).…”