Methyl- 2- benzenesulfonate

C20H22N2O2S2 13993-66-3) see Protizinic acid 2-methaxy-5-methyl-Y-phenylbenzenepropanol 4-methyl-benzenesulfonate... 

Hydrolyses of alkyl halides and arenesulfonates have long been known to be micelle-inhibited (Gani et al., 1973 Lapinte and Viout, 1973, 1979) but now k+/k < 1, except for hydrolysis of methyl benzenesulfonate which involves extensive bond making in the transition state (Al-Lohedan et al., 1982b Bunton and Ljunggren, 1984). Thus values of k+/k < 1 seem to be characteristic of hydrolyses in the SN1-SN2 mechanistic spectrum which involve considerable bond breaking in the transition state, and k+/k is very low for hydrolyses of diphenylmethyl halides where the transition state has considerable carbocation character (Table 8). 

A solution of 2.58 g (5.9 mmol) of (4-methoxyphenyl)methyl 6/J-benzylideneamino-6a-methylpenicillanate (2. R1 = C6H5 R2 = 4-CH3OC6H4CH2 R3 = CH3) in 75 mL of ethyl acetate is stirred at 20 C. 1.61 g (8.5 mmol) of 4-methyl benzenesulfonic acid and 1.61 mL(90 mmol) of water are added. A white solid starts to precipitate almost instantaneously. The reaction is allowed to proceed for 3 h before the white solid is filtered off and dried in vacuo to give 2.47 g (80%) of a salt. The latter is treated with aq NaHC03 to liberate the free amine which is recrystallized from ethyl acetate/hexane yield 1.33 g (65%) mp 84-87 °C. 

Displacement by chlorine atoms has also been observed on illumination of a carbon tetrachloride solution of diphenyl sulfone and excess chlorine. However, phenyl-, and methyl benzenesulfonates showed no displacement. The following mechanism is proposed for the reactions ... 

First-Order Rate Constants for the Neutral Hydrolysis of Some Substituted Methyl Benzenesulfonates in Aqueous Solution at 25 °C a... 

A second example is the yellow pyrazolone salt, Pigment Yellow 191 [129423-54-7]. It is the calcium salt of diazotized 2-amino-4-chloro-5-methyl-benzenesulfonic acid coupled with 3-methyl-1-[3 —sulfophenyl]-5-pyrazolone and provides a reddish yellow pigment for use in plastics applications. It shows very good heat stability and excellent resistance to nonpolar solvents and commonly used plasticizers (qv). It finds applications in high density polyethylene, polystyrene, and ABS, and shows satisfactory lightfastness. 

Mol. wt. 279.30, m.p. 100-101°. The reagent is obtained by reaction of pyridine-4-carboxaldehyde with methyl benzenesulfonate in refluxing benzene (83% yield). 

The nucleophilicity of chloride ion in the SN2 reaction with methyl benzenesulfonate was found to decrease as the solvent was changed from cyclohexane to acetone to butan-2-one to DMF to acetonitrile to methanol.78 Activation parameters in each solvent are reported. 

Sulfonation. The direct sulfonation of alkylaminotriphenylmethane dyes gives mixtures of substituted products. Although dyes containing anilino or benzylamino groups give more selective substitution, a sulfonated intermediate such as 3[(N-ethyl-N-phenylamino)methyl]benzenesulfonic acid (ethylbenzylanilinesulfonic acid) is the preferred starting material. However, Patent Blue V [354649-0], Cl Acid Blue 3, was made from 3-hydroxybenzaldehyde and two moles of diethyl aniline, followed by sulfonation of the leuco base and oxidation to the dye. FD C Green 2 [5141 -20-8/,... 

ETHYL-a-METHYL ACRYLATE see EMFOOO ETHYL-p-METHYL BENZENESULFONATE see EPW500... 

The easiest way to identify symbiosis is to examine a ratio such as A ch3i/A ch3F5 which will be large for soft nucleophiles and small for hard ones. A convenient probe is an ambident nucleophile which usually has a hard site and a soft site. An example is Me2SO, which reacts at oxygen with methyl benzenesulfonate and at sulfur with methyl iodide. These changes in selectivity have been found in all solvents, including dipolar, aprotic ones. " ... 

Cetats Cetyl trimelhyl ammonium p-toluene sulfonate EINECS 205-324-8 Hexadecyltrimethyl-ammonium toluene-p-sulphonate 1-Hexadecan-aminium, N,N,N-trimethyl-. salt with 4-methyl-benzenesulfonic acid (1 1) N,N,N-Trimethyl-1-hexadecanaminium salt with 4-methylbenzenesulfonic acid Trimethylcetylammonium p-... 

The following have also been prepared by the baking method 2-amino-3,5-dimethyl-134 and 4-amino-3-methyl-benzenesulfonic acid135, 2-amino-5-sulfobenzoic acid.136 Rearrangement of acid sulfates can also be effected by heating them in inert high-boiling solvents.137... 

Direct sulfonation of amines by sulfuric acid or oleum is not as clear-cut as the baking process. / -(Ethylamino)benzenesulfonic add is formed from A-ethyl aniline,116 but both m- and / -(dimethylamino)benzenesulfonic acid are formed from A,7V-dimethyl aniline.138 According to Blangey and his coworkers,124d 139 m-[(iV-ethyl-7V-phenylamino)methyl]benzenesulfonic acid is obtained from JV-benzyl-JV-ethylaniline. 

CAS 4403-90-1 EINECS/ELINCS 224-546-6 Synonyms Acid green 25 Alizarine cyanine green F Cl 61570 2,2 -[(9,10-Dihydro-9,10-dioxo-1,4-anthracenediyl) diimino] bis (5-methyl) benzenesulfonic acid disodium salt Classification Anthraquinone color Empirical C28H2oN2Na20sS2 Formula C28H20N2O8S2 2Na Properties Dullish blue-gm. m.w. 622.57 Toxicology Low skin toxicity may cause skin irritation and sensitivity TSCA listed Uses Colorant for pharmaceuticals and surgical sutures Use Level 0.6% max. (sutures)... 

Di hydro-9,10-dioxo-1,4-anthracenediyl) diimino] bis (5-methyl) benzenesulfonic acid disodium salt. See D C Green No. 5... 

C10H19NO5 233.264 Cryst. (Me0H/Me2C0/Et20)(as 4-methylbenzenesulfonate salt). Mp 175-176° (4-methylbenzenesulfonate salt). Mg +94.6 (c, 1.7 in H2O) (4-methyl-benzenesulfonate salt). 

Methylbenzenesulfinyl Chloride 2-Methylbenzenesulfonamide 4-Methylbenzenesulfonamide Methyl benzenesulfonate 2-Methylbenzenesulfonicacid 2-Methylbenzenesulfonyl chloride 2-Methylbenzenethiol 3-Methylbenzenethiol 4-Methylbenzenethiol... 

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