Facile synthesis of a dimeric titanium(iv) complex with terminal TiO moieties and its application as a catalyst for the cycloaddition reaction of CO2 to epoxides. Issue 100 (13th October 2016)

• Record Type: Journal Article
• Authors: Kim, Hyejin; Choi, Sung Ho; Ahn, Duseong; Kim, Yoseph; Ryu, Ji Yeon; Lee, Junseong; Kim, Youngjo
• Is Part Of: RSC advances. Volume 6:Issue 100(2016)
• Page Start: 97800
• Page End: 97807
• Publication Date: 2016-10-13
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra23255h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Dimeric terminal oxo-titanium complex1 having no TiO→Ti bonds could be easily synthesized. The titanium complexes1 and2 could act as catalysts for cycloaddition between CO2 and epoxides in the presence of cocatalysts. Abstract : In this report, facile and exclusive synthesis of dimeric titanium(iv ) complex with a terminal TiO moiety from the reaction between novel pyridine-based tridentate ligand (LH2 ) and Ti(O-i-Pr)4 under the bubbling of wet air is presented. Alternatively, the same dimeric Ti complex was obtained via wet air bubbling of monomeric LTi(O-i-Pr)2 or addition of the same equiv. of H2 O into LTi(O-i-Pr)2 . All compounds includingLH2 and two titanium complexes were characterized by single crystal X-ray analyses. Newly synthesized terminal oxo-titanium compound is the first example of structurally characterized dimeric terminal oxo-titanium compound having no TiO→Ti bonds. Two titanium complexes were used as effective catalysts for the cycloaddition of CO2 to propylene oxide in the presence of various kinds of cocatalysts such as n -Bu4 PBr, n -Bu4 NI, n -Bu4 NBr, n -Bu4 NCl, PPNCl, and DMAP.