TPTE

Tpte [2-[(4-tritylphenyl)thio]ethyl] Z = Cbz benzyloxycarbonyl protecting group... 

A-Chlorosuccinimide 1 N NaOH." With this method, the sulfide is oxidized completely to the sulfone, which is cleaved with hydroxide more readily than the sulfoxide formed by periodate oxidation. It has been reported that oxidation of the sulfide leads to oxidation of adenine and gua-nine." However, see the discussion of the TPTE group below. 

Fujikawa et al. studied a series of triphenylamine (TPA, 14) oligomers from the dimer TPD up to the related pentamer and used them as HTMs [71]. Their results indicated that the thermal stability of the OLEDs was dramatically improved using a HTM TPTE (15) (Scheme 3.9), a tetramer of TPA. The resulting OLED devices show uniform light emission in continuous operation up to 140°C without breakdown [72],... 

Figure 3. Reconstructed gas chromatogram of TPTM and TPTE on 3% OV-1 at200°C...

Figure 7. Typical PROMIM chromatograms of TPTM (a) and TPTE (b) in soybean extracts (A) soybean control sample (10 mg sample aliquot injected, < 0.05 ppm) (B) soybean control sample fortified with 0.05 ppm TPTH (10 mg sample aliquot injected, 0.045 ppm found, 90% recovery) (C) soybeans treated at 0.5 lb a.i./acre (10 mg sample aliquot injected, < 0.05 ppm)...

Figure 17 shows SIM chromatograms of TPTM and TPTE with a large amount of the Methylvendex derivative. A small potential interference was observed. However, the isotopic abundance of the Methylvendex derivative is not similar to that observed with TPTM. Therefore we conclude that the possibilities for confusion are minimal. 

Figure 17. SIM chromatograms of TPTM (a), TPTE (b), and methylvendex derivative (v) on 3% OV-7 with temperature programming to 265°C...

FIGURE 10.34. Current-voltage characteristics of the LEDs based on PF2/6 and blends with different hole-transport materials. Filled squares PF2/6 filled triangles PF2/6+TPTE filled diamonds PF2/6+ST 755 open triangles PF2/6+ST 16/7. Inset The EL intensity versus current characteristics. (From Ref. 68.)... 

Although the current density at a given bias is reduced by blending, the luminous efficiency of the devices sharply increases. The inset to Fig. 10.34 plots the EL intensity versus current density for all four devices. All three doped LEDs show much higher EL output at a given current density. Both of these phenomena can be attributed to better current balance. It has been proposed that trapping of holes will cause a space-charge field to develop under bias, which reduces the total electric field at the anode and increases the field at the cathode.69 This additional field will block hole injection and facilitate electron injection. As holes are the majority carrier, the overall current density will decrease, but the carrier balance is much improved. The device efficiency (Cd/A) consequently increases from 0.04 for the PF2/6 LED to 0.08 for ST 755, 0.15 for ST 16/7, and 0.87 for TPTE. Thus, a 22-fold improvement of device efficiency was obtained. The color purity of the blend LEDs was also observed to improve with a reduction of the polyfluorene excimer band at 560 nm. 

Tritylphenylthio)ethyl (TPTE) 2-[4-(C6H5)3CC6H4S]CH2CH2-... 

TPP = 5,10,15,20-tetraphenylporphine, 252 Tpte protecting group, 216, 217 Trajectories in reactions of nucleophiles, 316 trans-Selectivity. See cis/trans Transcriptase, reverse, 242 Transform, retro-synthetic, 193-196 Triamterene, 308 Trias teranone, 94... 

Bernard de Treynscm "TPte Book of Natural Philosophy of Metals )... 

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