Interaction of titanium(III) zwitterionic complex Cp[η5-C5H4B(C6F5)3]Ti with organic halides: Synthesis and X-ray crystal structure determination of zwitterionic titanocene monohalides Cp[η5-C5H4B(C6F5)3]TiX (X=Cl, Br) and their catalytic activity in the ring-opening polymerization of ε-caprolactone

In Search for Titanocene Complexes with Improved Cytotoxic Activity: Synthesis, X‐Ray Structure, and Spectroscopic Study of Bis(η5‐cyclopentadienyl)difluorotitanium(IV)

“…The molecule has the familiar, distorted tetrahedral shape found in the chloro [26], bromo [27] and iodo [28] members of the [Ti IV ( η 5 -C 5 H 5 ) 2 X 2 ] family of complexes. The distorted tetrahedral structure arises if we consider the Cp ring centroids as each occupying one coordination site around the metal ion.…”

Tetrabenzo[a,c,g,i]fluorenyltitanium(III) and -(IV) Complexes: Syntheses, Reactions, and Catalytic Application

“…17 In order to synthesize a tetrabenzo[a,c,g,i]fluorenyltitanium(IV) species from compound 3, oxidative chlorination with CCl 4 promised to be successful. 19 Reacting TiCl 3 (THF) 3 with TbfLi(THF) 4 in toluene with subsequent extraction and thus simultaneous oxidative chlorination using CCl 4 afforded TbfTi-Cl 3 (4) in an acceptable overall yield of 66%. The dark purple compound is quite insensitive to air and moisture.…”

Discrete Cationic Complexes for Ring-Opening Polymerization Catalysis of Cyclic Esters and Epoxides

“…Moreover, the monometallic titanium(IV) halides Cp{η 5 -C 5 H 4 B(C 6 F 5 ) 3 }Ti-(X) (X = Cl, 125; Br, 126; Figure 31), obtained by oxidation of Cp{η 5 -C 5 H 4 B(C 6 F 5 ) 3 }Ti with CCl 4 or BrCH 2 CH 2 Br, also partially polymerized large amounts of CL (1000−6000 equiv per Ti atom) in toluene at 60−75 °C. 113 The chloro compound 125 was somewhat more active than the bromo derivative 126: monomer conversion was in the range 11−61% for 125 and 6−22% for 126 after 8 days. Both afforded high molecular weight monodisperse PCLs (M n = 43 000−112 000 g•mol −1 and M w /M n = 1.3−1.6).…”

“…However, the reactions were very slow, requiring 8–10 days to reach near complete conversion of the monomer. Moreover, the monometallic titanium­(IV) halides Cp­{η 5 -C 5 H 4 B­(C 6 F 5 ) 3 }­Ti­(X) (X = Cl, 125 ; Br, 126 ; Figure ), obtained by oxidation of Cp­{η 5 -C 5 H 4 B­(C 6 F 5 ) 3 }Ti with CCl 4 or BrCH 2 CH 2 Br, also partially polymerized large amounts of CL (1000–6000 equiv per Ti atom) in toluene at 60–75 °C . The chloro compound 125 was somewhat more active than the bromo derivative 126 : monomer conversion was in the range 11–61% for 125 and 6–22% for 126 after 8 days.…”

“…Zwitterionic titanium­(IV) complexes with positively charged metal atoms for the ROP of CL with an ORTEP rendering of 125 (Shur/Rosenthal/Baumann). ,, …”