Titanium complexes based on chiral enantiopure dialkanolamines: synthesis, structures and catalytic activityстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:New chiral enantiopure tridentate ligands (dialkanolamines) RN(CHR(3)CR(1)R(2)OH)(CHR(4)CR(5)R(6)OH) 10-17 were synthesized by the opening of the epoxide ring by the action of the amines or alkanolamines. Titanium complexes, viz. [RN(CHR(3)CR(1)R(2)O)(CHR(4)CR(5)R(6)O)]Ti(O-i-Pr)(2) 18-23 and [RN(CHR(3)CR(1)R(2)O)(CHR(4)CR(1)R(6)O)](2)Ti 25-31 were synthesized by treatment of Ti(O-i-Pr)(4) With one or two equivalents of corresponding dialkanolamines. Complex (R)-PhCH(Me)N(CH(2)C(Me)(2)O)(2)TiCl(2)*HNMe(2) 24 was obtained from the reaction of One equivalent of dialkanolamine 10 with (Me(2)N)(2)TiCl(2). The composition and Structure of all novel compounds were established by (1)H and (13)C NMR spectroscopy as well as elemental analysis. The possible Solution structures of 18-31 are discussed. The single-crystal X-ray diffraction study of 23, 25-28, 30 31 indicates monomeric Structures ill the solid state. Chiral complexes 20, 22, 23 25, 26, 30 were tested as chiral catalysts in the Abramov reaction and demonstrated moderate enantiomeric activity.