Tetrabenzo[a,c,g,i]fluorene (Tbf-H, 4) was deprotonated with n-butyllithium, leading to ionic Tbf-LiLn complexes 5 and 6, consisting of well-separated cations (Li(THF)4 (5), Li(DME)3 (6)) and Tbf
anions. Subsequent reactions with chlorotitanium alkoxides Cl
x
Ti(O
i
Pr)4
-
x
(x = 1, 3) and chlorotitanium
phenoxides {ClTi(OR)3(THF)}2 (R = C6H5 (12), 4-MeC6H4 (13), 4-
t
BuC6H4 (14)) give a series of η5-tetrabenzo[a,c,g,i]fluorenyltitanium complexes (TbfTiCl2(O
i
Pr) (11) and TbfTi(OR)3 [R =
i
Pr (10), C6H5
(15), 4-MeC6H4 (16), 4-
t
BuC6H4 (17)]), which were characterized by NMR, MS, and IR measurements
and X-ray crystallography. Additionally, the compounds' properties regarding the syndiospecific
polymerization of styrene when activated with MAO were explored. The activities increase in the following
order [kg sPS/(mol Ti × mol styrene × h]: 11 (1420) < 17 (3400) < 16 (3740) < 10 (6040) < 15
(6720).
The generation of long, mutually oriented nanofibers of functionalized phenylene oligomers is reported for the case
of symmetrically 4,4‘ ‘‘-functionalized p-quaterphenylene molecules with chloride groups. Two domains of up to 30 μm long, oriented
fibers with nanoscopic widths and heights grow along muscovite mica 〈110〉 directions. Their mutual alignment increases with
increasing substrate temperature during deposition. The photoluminescence spectrum around 380 nm shows well-resolved excitonic
transitions and its overall intensity depends on fiber morphology.
The title compound, CIsH21NOT, was synthesized as part of a study involving the testing of new carbohydrate-derived chiral auxiliaries. Its solid-state conformation and absolute configuration were determined. The R configuration for the chiral centre at C-22, created during the synthesis, was deduced from knowledge of the absolute structure of the o-xylose moiety.
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