Conjugate addition reactions Titanium chloride

Reaction of the lithium enolate of (1) followed by reaction with chlorotrimethylsilane provides ketene acetal (3). This enol reacts with aldehydes in the presence of a Lewis acid to provide unsaturated esters (eq 7). With conjugated enones, (3) undergoes conjugate addition when Titanium(IV) Chloride is used as catalyst (cf. eq 5). ... [Pg.298]

Lithium butyldimethylzincate, 221 Lithium sec-butyldimethylzincate, 221 Organolithium reagents, 94 Organotitanium reagents, 213 Palladium(II) chloride, 234 Titanium(III) chloride-Diisobutylalu-minum hydride, 303 Tributyltin chloride, 315 Tributyl(trimethylsilyl)tin, 212 3-Trimethylsilyl-l, 2-butadiene, 305 Zinc-copper couple, 348 Intramolecular conjugate additions Alkylaluminum halides, 5 Potassium t-butoxide, 252 Tetrabutylammonium fluoride, 11 Titanium(IV) chloride, 304 Zirconium(IV) propoxide, 352 Miscellaneous reactions 2-(Phenylseleno)acrylonitrile, 244 9-(Phenylseleno)-9-borabicyclo[3.3.1]-nonane, 245 Quina alkaloids, 264 Tributyltin hydride, 316 Conjugate reduction (see Reduction reactions)... [Pg.361]

Reactions of similar organoalkynyl/allenyl silanes containing various metals with carbonyl compounds to give propargylic products have been reported. " Conjugate addition of allenyl stan-nanes to Q , -unsaturated carbonyl compounds to give propargylic products can be effected in the presence of titanium(IV) chloride. ... [Pg.347]

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