Metal alkoxides reactions with acyl halides

In addition to the general procedure iUusIrated by Eq. (2.182), another route has been employed for the synthesis of metal alkoxides (and particularly analogous siloxides) by the reaction of metal alkoxides with esters (and silyl esters) (Section 4.3). Further, the reactions of metal alkoxides with acyl halides (or hydrogen halides) and unsaturated substrates such as CO, CO2, CS2, organic-isocyanates and isothiocyanates, chloral, etc. have been utilized for the preparation of haUde-alkoxides (Section 4.11) and interesting insertion products (Section 4.12), respectively. 

The reactions of metal alkoxides with acyl halides may be illustrated by Eq. (2.264) ... 

The use of 0-metallation of alcohols or enols to enhance their reactivity towards electrophiles, such as aldehydes or alkyl or acyl halides has been reported by Davies.The reaction of triorganotin alkoxides with other polar multiply-bonded acceptors was also reported (Scheme 6.3.8). 

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