Methylal, dimethyl

Diisopropyl ether, see Isopropyl ether Dimethoxymethane, see Methylal Dimethyl acetamide Dimethylamine... 

The halogenation of 3-methoxy- or 3-methyl(dimethyl)amino-1,2,4-triazine 2-oxides 18 was found to proceed in a similar manner, resulting in 6-halo-1,2,4-triazine 2-oxides 19 (77JOC3498, 78JOC2514). 

Alkylation of compound 2 has been confirmed at position 1 as predicted for methylation (dimethyl sulfate) and ethylation (triethyloxonium fluoroborate) (93T4307), and in the simple case of compound 193 (94AJC1009), and in the compound 194 (82MI1). The ylide 195 (84JCS(P1)1891) is substituted at position 3. 

Diethyl ketone Diethyl phthalate Difluorodibromomethane Diglycidyl ether (DGE) dl Dihydroxybenzene, see Hydroquinone Diisobutyl ketone Diisoctyl phthalate Diisodecyl phthalate Diisononyl phthalate Diisopropyl ether Diisopropylamine Di-linear 79 phthalate Dimethoxymethane, see Methylal Dimethyl acetamide Dimethylamine... 

In addition to DBT and BT, strain A11-2 could utilize methyl, dimethyl, and trimethyl DBTs as sulfur sources. The desulfurization of asymmetric alkylated DBTs was assessed to understand the sulfur specificity of this organism. It was shown to desulfurize several asymmetric alkyl DBTs up to C3-DBTs. It was shown that the rates of desulfurization depended on not only the position of alkyl substitution but also the number and length of alkyl substitution. An attempt was made to co-relate the data based on a molecular shape parameter. Selectivity of this organism was compared with R. erythropolis KA2-5-1 and, although clear differences were observed, the parameter fitting was not perfect. Two Paenibacillus strains, Paenibacillus sp. A11-1 and All-2, were patented [87] and were deposited as PERM BP-6025 and PERM BP-6026 in 1996 [122,123],... 

Peat, Schluchterer and Stacey6 later obtained a small amount (0.23%) of methyl 2,3,4,6-tetramethyl-n-glucoside from the hydrolytic products of a methylated L. dextranicum dextran, in addition to 90% methyl 2,3,4-trimethyl-D-glucosides, and on the basis of these results, postulated a minimum chain length of 550 units for this dextran. An appreciable amount of methyl dimethyl-D-glucosides was obtained, but these may not indicate side chain linkages since a mixture of dimethyl isomers was present, and the dextran was not fully methylated (only 44.5% methoxyl rather than 45.6%). 

The generation and recovery of stannane, methyl-, dimethyl-, and trimethyl-stannane were studied in seawater. Average tin recoveries for the six samples analysed, to which were added 0.4-1.6 ig methyltin compounds and 3ng inorganic tin, ranged from 96 to 109%. Reanalysis of analysed samples shows that all methyltin and inorganic tin is removed in one analysis procedure. 

The same buffer may be used for separation of aliphatic amines such as methyl-, dimethyl-, trimethyl-, ethyl-, propyl-, diethyl-, triethylamine, morpholine, etc. 

Tetramethyl-/ -phenylenediamine has been obtained in low yield by the reaction of />-phenylenediamine with various alkylating agents such as methyl iodide, methanol in the presence of hydrochloric acid at 170-200°, or formaldehyde and formic acid. In addition it has been prepared by methylating / -dimethyl-aminoaniline using methanol in the presence of hydrochloric acid at 170 -200°, followed by treatment of the resulting salts with aqueous ammonia at 180 190°. In the most recent >ro-cedure, / -phenyIenediamine was alkylated with sodium chloro-... 

GC-MS examination of the PAH fraction of sample S2 (S2-C2) gave very similar results the total ion chromatogram is shown in Figure 5. Major constituents were phenanthrene, fluoranthene, pyrene, and methyl, dimethyl/ethylphenanthrene/anthracene. Relative abundance of some C2-alkylphenanthrenes/anthracenes were higher in this sample than in S1-C2. Smaller quantities of benzo[ghi]fluoranthene, chrysene, benzo[ajanthracene, tripheny-lene, benzo[b,j, k]fluoranthenes, and benzo[e aJpyrenes and were characterized by MS. In addition, most compounds listed in Table 1 were also detected in this sample. 

Diethyl(trifluoromethyl)amine and [Difluoro(phenyl)methyl)(dimethyl)ainine... 

Diethyl(trifluoromethyl)amine (19) and [difluoro(phenyl)methyl](dimethyl)amine (21) are synthesized from the corresponding diethylformamide (18) and N, /V-dimethylbenzamide (20), respectively. The fluorination is achieved with sulfur tetrafluoride in the presence of potassium fluoride at 150l,C.36... 

Diethyl(trifluoromethyl)amine (19 14.1 g, 0.1 mol) was added dropwise to i-PrOH (22 6g, 0.1 mol) at 40CC with stirring, an exothermic reaction occurred and the mixture was brought to reflux. Once the addition was complete the mixture was stirred for a further 15 min. The volatile 2-fluoropropane (23) which evolved during the course of the reaction was condensed into a cold trap at — 78°C yield 4.6 g (74%). An identical yield was obtained when the same procedure was performed with [difluoro(phenyl)-methyl](dimethyl)amine (21) instead of 19. 

Similar processes are observed for the monosubstituted aminobenzenes, as shown for aniline [Fig. 5(a)]. Such efficiency spectral curves were obtained also for methyl-, dimethyl-aniline, and benzylamine [Figs. 

A rather different study of the kinetics of decomposition of solid complexes of [VO(dbm)2(L)] (dbm = dibenzoylmethanato, L = py and several methyl-, dimethyl- and amino-pyridines) used differential scanning calorimetry (DSC).531 Using the temperature that corresponds to the loss of the molecule L in equation (37), a linear relationship was found between it and the basicity of L, except for 4-amino- and 4-methyl-pyridine. 

The terpenes used were mainly /3-pinene fractions provided by DRT (Soci6td des Derives Rdsiniques et Terpeniques, Vielle-S Girons) and, for certain experiments a turpentine oil containing the main three terpenes a-pinene, /3-pinene, and A -carene. The /3-pinene fractions contained 80-90% /3-pinene, 2% a-pinene, 4-5% myrcene, 2-3% dipentene and 700-1500 ppm S. GC-MS analyses showed that sulfur impurities were composed of alkyl and alkenyl sulfides (mainly dimethyl sulfide), alkyl and alkenyl disulfides (mainly dimethyl disulfide), trisulfides, thiophene and alkylthiophenes (methyl, dimethyl, acetyl and tertiobutyl). 

The cleavage of the sulfur-carbon bond of thioacetals and thioketals,671 thioortho-formates672 [Eq. (3.101)], and tetraalkyl thioorthocarbonates673 [Eq. (3.102)] leads to the corresponding mono-, di-, and trithiocarbenium ions, respectively. Trimethylthio-carbenium ion 361 was also prepared by methylating dimethyl trithiocarbonate [Eq. (3.102)]. 

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