Trimethylammonium perchlorate

Poly(dimercuryimmonium perchlorate), 4012 Pyridinium perchlorate, 1863 Tetraethylammonium perchlorate, 3088 Tetrafluoroammonium perchlorate, 3986 N. N. N. A-Tctramcthv 1 formam idinium perchlorate, 2026 Triaminoguanidinium perchlorate, 0515 Trimethylammonium perchlorate, 1322 Trimethylhydroxylammonium perchlorate, 1323 Tri(4-tolyl)ammonium perchlorate, 3824 Uronium perchlorate, 0491... 

Trimethyltoluidinium Perchlorate (or Tolyl-trimethylammonium Perchlorate). C10H16ClNO4 mw 249.70 OB to C02 —153.8%. Three isomers of trimethyltoluidinium perchlorate were prepd by treatment of the iodide with Ag perchlorate in aq soln, the Ag iodide filtered off, the filtrate evapd until crysts formed, and the crysts re-crystd from acet/eth (Ref 7). The salts all expld when heated above their mp s (Ref 5) Trimathyl-o-toluidinium Perchlorete. o-MeC6H4N+Me3.0104" cryst solid mp 198—... 

Trimethylamine oxide perchlorate, see Trimethylhydroxylammonium perchlorate, 1319 Trimethylamine oxide, 1309 Trimethylammonium perchlorate, 1318... 

The high instability of bromine monochloride (the heat of formation of which has been estimated as 0.3 kcal.mole ) provides some difficulty in studying its reactions. Nonetheless, the rate of addition of mixtures of chlorine and bromine (with the total concentration of halogen constant) to c/s-cinnamic acid in carbon tetrachloride-acetic acid mixtures was greatest when [Br2]/[Cl-i] was unity . The kinetic form of the reaction was the same as that for the other interhalogens and for bromine, but not for chlorine. The possible intervention of bromine monochloride in the reaction of allyl trimethylammonium perchlorate with hypobromous acid in aqueous acid has also been reported here, the kinetics were . 

The striking nucleofugacity of the trimethylammonium leaving group compared with the nitro group in the reaction with fluonde ion is illustrated by the relative reactivities of p-nitrophenyltnmethylammonium perchlorate and p dmi-trobenzene [7J] (Table 4)... 

The most commonly used quaternary ammonium salts are tetrabutylammonium perchlorate (TBAP), tetrafluoroborate (TBAT), the halides (TBACl, TBAB, and TBAI), and the corresponding tetraethylammonium salts, such as the perchlorate (TEAP), but also the tetramethyl- or tetrapropylammonium salts have been employed the former cannot undergo a base-promoted Hofmann elimination. However, evidence has been found for the formation of trimethylammonium methylide [460]. In nonpolar solvents it may be necessary to employ tetrahexyl- or tetraoctylammonium salts. The tetraalkylammonium ions are soluble in many nonaqueous media, and they may be extracted from an aqueous solution by means of chloroform or methylene chloride [461,462], and tetraalkylammonium salts may thus be prepared by ion extraction [462]. Tetrakis(decyl)ammonium tetra-phenylborate is soluble even in hexane [442,443]. 

On inert polymer substrates, additional preparation steps are required to enable initiator immobilization. For instance, the surface of PDMS stamps was oxidized with oxygen plasma, turning the Si-CHs groups into Si-OH groups [6]. On these hydroxyl groups, a trichlorosilane ATRP initiator was attached. Aqueous ATRP of 2-(methacryloyloxy)-ethyl trimethylammonium chloride (METAC) yielded a strong cationic polyelectrolyte brush, which was used to selectively transfer perchlorate anions to flat PMETAC-covered surfaces. As a result, chloride anions were locally replaced by perchlorate anions on the flat surface, and the swellability of the polymer brush was selectively changed. 

Cetyl trimethylammonium bromide-perchloric acid titration method... 

The sample is dissolved in a 4 1 mixture of diehloromethane and HCOOH and a stoichiometric excess (2 g) of cetyl trimethylammonium bromide (iV-hexadecyl-fV, N, N trimethylammonium bromide) (CTAB) added and titrated with O.IN aeetous perchloric acid (ASTM E 200) using crystal violet as indicator. 

Although most of the precursors in Fig. 42.13 are shown as substituted N02-compounds, the corresponding trimethylammonium salts (triflates and perchlorates) often lead to comparable or even higher yields (see Table 42.6). 

Solutions in acetone-dg of known concentration close to 3 x 10 mol L in choline or acetylcholine perchlorates were prepared and used as solvents for calixarene salts so as to obtain series of solutions in which the host guest (calixarene quaternary ammonium group) ratio varied between 0 and 2.00. Proton chemical shifts were measured for the trimethylammonium resonances of all solutions using a Bmker WP80 instmment. Inclusion equilibrium constants were determined from nonlinear least-squares fitting of the chemical shift vs. host guest ratio curves. 

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