Tetrabutylammonium hydroxide TBAOH

Similar procedures adopted for the synthesis of TS-1 (the mixed alkoxide method, dissolved titanium method, pre-hydrolysis method, wetness impregnation method, and promoter induced synthesis method) were also used for the synthesis of TS-2. Tetrabutylammonium hydroxide (TBAOH) instead of TPAOH was used as the template (6,7,305-308). 

The hydrothermal synthesis of Zr-Sil-2 samples was carried out using the gel solutions containing tetraethylorthosilicate (TEOS), tetrabutylammonium hydroxide (TBAOH, 40% aqueous), ZrCU, Zr(acac)4 and distilled water. The molar composition of the final gel was the following Si02 x Zr02 0.40 TBAOH 30 H2O with 0[Pg.219]

Likewise, the desilication procedure has been extended to other zeolites besides ZSM-5, such as MOR [153] and ZSM-12 [154]. The alkali treatment can also be applied using organic bases (TPAOH and tetrabutylammonium hydroxide (TBAOH)) instead of NaOH. In this way, the mesopore volume can be optimized by incorporating both NaOH and quaternary ammonium cations [155], such as TPA+ or TBA, in the alkaline treatment. These cations act as pore growth moderators, and a fact that is essential for the success of this method is that these do not enter the zeolite micropores (hence TMA" " does not work). The addition of these cations together with the alkaline solution... 

Regardless of the solvent used, various additives have been explored in the Sonogashira reaction to increase yield, and reaction rates. Ammonium and silver salts have shown the most promise in this respect. Mori et al. [123] found that by using 2 equiv. of either tetrabutylammonium fluoride (TBAF) or tetrabutylammonium hydroxide (TBAOH), activation of the cross-coupling with... 

The ion-pairing reagent is a compound that has both an organic and an ionic end. To promote ionic interaction, the ionic end should have a charge opposite to that of the analytes of interest. For anionic IPC, a commonly used ion-pairing reagent is tetrabutylammonium hydroxide (TBAOH) for cationic IPC, hexanesulfonic acid (HSA) is often chosen. In principle, the ionized/ionizable analytes interact with the... 

Figure 7.12 Separation of three compounds using tetrabutylammonium hydroxide in the mobile phase. Elution order (1) permethrin, (2) zidovudine, (3) trimethoprim. Flow = 2 ml/min C02, 100 /d methanol-tetrabutyl-ammonium hydroxide for 2.0 min, 100-500 /d/min methanol-tetrabutyl-ammonium hydroxide for 2.0 min, 100-500 fd/min methanoI-TBAOH in 4.0 min, hold at 500 /d/min. Column Deltabond CN (250 x 4.6 mm ID). Oven temperature 60°C UV detection at 254 nm. (Reprinted from Ref. 9 with kind permission of Dr. Alfred Huthig Verlag GmbH, Heidelberg.)...

Prehydrolysis methodu ing tetraethylorthosilicate, titanium tetrabutoxide, and tetrabutylammonium hydroxide. Gel composition SiO2 xTiO2 0.2-TBAOH 20H2O, x - 0.14-0.0055, 443 K, 2-7 days... 

Today, the CMMS micromembrane suppressor, introduced in Section 3.4.3, is employed for ion-pair chromatography of cations. Its solvent stability is sufficient, and it is regenerated with tetrabutylammonium hydroxide, also for ion-pair chromatographic applications. The regenerent concentration adheres to the concentration of the ion-pair reagent. A reagent concentration of c = 0.002 mol/L, for example, requires a TBAOH concentration of c = 0.04 mol/L. 

MTBE methyl tertiary-butyl ether PO propylene oxide SAPO silico-aluminophosphate SBU secondary building unit SDA structure-directing agent TBAOH tetrabutylammonium hydroxide TBHP a -butyl hydroperoxide TBOT tetrabutyl orthotitanate TEA tetraethylammonium... 

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