Dimethylaluminium alkoxides: a physico-chemical investigation

Abstract

have been synthesised and studied by 'H, 13C, ' ' 0 and NMR, I R and mass spectrometry. With the exception of R = CH2CH,Pri, all the compounds with branched-chain alkoxide substituents are purely dimeric (x = 2), while the former and the n-

Reactions of Trimethylaluminium: Modelling the Chemical Degradation of Synthetic Lubricants

“…These data suggest that 2:1r eaction of TMA with ester has occurred, one equivalent of TMA expelling methoxide to induce the formationo fareactive EtMeC=Oi ntermediate alongside Me 2 AlOMe 3 (d H = 3.06, À0.59 ppm) [32] before as econd equivalent of TMA has reacted with the ketone to give the dimethylaluminium alkoxide Me 2 AlOCEtMe 2 2.I ntegrals of peaks at d H = 0.61 (2)a nd 3.06 ppm (3)s uggest the two products to be present in a1 :1 ratio. Lastly,t he observation that signals at d H = À0.47 and À0.59 ppm reveal relative integralso f2:1 leads us to speculate that 2 traps the final (unreacted) equivalent of TMA present to give Me 2 AlOCEtMe 2 (TMA) 2(TMA) (Scheme 1).…”

“…[27] However, this has tended to focus not upon its synthesis as ab y-product of ketonization reactions but rather on the oxophilic derivatization of AlÀCbonds [28] by moisture [29] or oxygen. [30] From astructural point of view,a luminium organooxide formation [31] and di-/trimerization is welle stablished, [32] for example, the simple aluminium alkoxide Me 2 AlOMeh as been shown to be trimeric. [33,34] In this work we model the reaction of TMA with synthetic POEs and elucidate intermediates along the reaction pathway between TMA and esters in general for the first time.…”

Deposition of alumina from dimethylaluminum isopropoxide

“…8,9 A 100 mL Schlenk flask equipped with a magnetic stir bar was charged with isopropyl alcohol (15.0 mL, 0.196 mol). The alcohol was degassed and cooled to −78 • C using a mixture of dry ice and acetone.…”

In Situ FTIR Characterization of Growth Inhibition in Atomic Layer Deposition Using Reversible Surface Functionalization

“…Likewise, the shifting of the TMA 700 cm -1 feature to lower wavenumbers is a common feature of many dimethyl alkoxy aluminum species. [13] Finally, in the 4 Torr spectrum in Fig. 3, all of the features corresponding to bridging methyls are gone, including the contribution located around 450 cm -1 .…”