Abstract
In the presence of Me 3 SiCl or MgCl 2 , Ti(OR) 4 was reduced by Mg powder in THF to gradually generate a specific low-valent titanium species, which mediated or catalyzed several synthetic reactions such as C-O bond-cleavage of allyl and propargyl ethers and esters, intra- and intermolecular cyclotrimerization of alkynes, reduction of epoxides and oxetanes via homolytic ring-opening, McMurry coupling reaction of aryl aldehydes, imino-pinacol coupling and reductive N-S or O-S bond-cleavage of sulfonamides or sulfonyl esters.
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