New low-valent titanium reagents for dicarbonyl coupling and their use in a general method of annulation
作者:Derrick L. J. Clive、K. S. Keshava Murthy、Chengzhi Zhang、William D. Hayward、Sylvain Daigneault
DOI:10.1039/c39900000509
日期:——
function (aldehyde or ketone) undergo intramolecular dicarbonylcoupling when treated with a reagent prepared either from titanium trichloride and C8K (relative molar ratio 1 : 2) or from titanium tetrachloride and sodium–naphthalene (relative molar ratio ca. 1 : 2.75); the reagent is used in excess (16 to 17 mol titanium halide per mol of dicarbonyl compound) and the process is the key step in a general