Titanium: Introduction

[Cp2TiCl2] as polymerization catalyst in aqueous medium: polymerization of styrene in water

“…It has already been shown that, an aqueous solution of Cp 2 TiCl 2 when refluxed for several hours affords undecomposed Cp 2 TiCl 2 along with TiO 2 [12,13]. Also, it [14]. Since the TiO 2 and other hydrolysis products are catalytically inactive, the efficiency of the catalyst is found to be less than expected.…”

Asymmetric Friedel–Crafts Alkylations of Indoles with Ethyl Glyoxylate Catalyzed by (S)‐BINOL‐Titanium(IV) Complex: Direct Access to Enantiomerically Enriched 3‐Indolyl(hydroxy)acetates

“…[20] Most significantly, as one of the most useful combinations, BINOL-Ti complexes were widely applied to various asymmetric reactions. [21,22] However, there are relatively few reports on the application of this versatile strategy for the FriedelCrafts reactions, except for two impressive examples, in which a chiral 6,6'-dibromo-BINOL-Ti complex was employed as the catalyst.…”

Heterobimetallic Calix[4]arene Complexes: Interconversion of Dimeric (Ca, Sr or Ba)/TiIV Complexes with a Monomeric K/TiIV Complex

“…In contrast, these same dimers are highly soluble in solvents such (1)ϪO(2, 3, 4, 7, 8) 87.89(7), 90.86(7), 87.44(7), 173.94(7), 91.04(7) O(2)ϪTi(1)ϪO (3,4,7,8) 87.81(7), 172.90(7), 94.79(7), 92.04(7) O(3)ϪTi(1)ϪO (4,7,8) 86.91(7), 94.66(7), 178.09(7) O(4)ϪTi(1)ϪO (7, 8) 90.37(7), 93.40(7), O(7)ϪTi(1)ϪO (8) 83.45(7) O(1)ϪK(1)ϪO (3,5,6) 57.56 (5), 110.84(6), 162.04(6), O(3)ϪK (1)ϪO (5, 6) 168.40(7), 104.62(6) O(5)ϪK (1)ϪO (6) 86.98 (7) as toluene, dichloromethane or THF. We utilised solubility differences to devise methods to interconvert the dimers, in general, with the corresponding K/Ti monomers, 4(a,b), the latter being readily recrystallised from a variety of solvents.…”

“…[8] The success of this synthetic route suggests that the relatively slow reaction of [TiCp 2 Cl 2 ] provides a synthetically engineered pathway for gradually delivering labile titanium() into the reaction mixture, which presumably allows ligation with calix [4] TMEDA, in contrast to the good yields, ca. 80%, for the strontium and barium analogues.…”