Mesitylenesulfonic acid

Briefly warming the reaction mixture solubilizes all the mesitylenesulfonic acid and drives the reaction to completion. Mesitylenesulfonic acid is less soluble than mesitylenesulfonyl chloride. Therefore, after everything dissolves, conversion of the acid to the acid chloride is complete. The product is partially hydrolyzed if it is poured into water while it is still hot. 

Mesitylenesulfonylhydrazine 2-Mesitylenesulfonic acid, hydrazide (8) Benzenesulfonic acid, 2,4,6-trimethyl-, hydrazide (9) (16182-15-3)... 

Other ketals which are frequently used if a modified acid stability is wanted are the cyclopentylidene, the cyclohexylidene and the cycloheptylidene ketals. They are readily prepared by the reaction of a diol and the cycloalkanone in toe presence of ethyl orthoformate and mesitylenesulfonic acid. The relative rates of their acid-catalyzed hydrolysis are given in Scheme 50. 

Compounds i, ii, and iii can be prepared by an acid-catalyzed reaction of a diol and the cycloalkanone in the presence of triethyl orthoformate and mesitylenesulfonic acid. The relative ease of acid-catalyzed hydrolysis [0.53 M H2SO4, H2O, PrOH (65 35), 20°C] for compounds i, iii, acetonide, and ii is C5 = C7 > acetonide s> Ce (e.g., f /2 for 1,2-0-alkylidene-a-D-glucopyranoses of C5, C7, acetonide, and Ct, derivatives are 8,10, 20, and 124h, respectively ). The efficiency of cleavage seems to be dependent upon the electronic environment about the ketal. ... 

Preparation.1 4,4-Dimethoxytetrahydropyrane (2) is distilled with 0.1% of mesitylenesulfonic acid to form the enol methyl ether (3). 

BSA Benzenesulfonic acid, sodium salt EBS 4-Ethylbenzenesulfonic acid MS 2-Mesitylenesulfonic acid SBA 2-Sulfobenzoic acid, sodium satal... 

CAS 4474-24-2 EINECS/ELINCS 224-748-4 Synonyms Benzenesulfonic acid, 3,3 -((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl) diimino) bis (2,4,6-trimethyl-, disodium salt Cl 61585 2-Mesitylenesulfonic acid, 4,4 -(1>4-anthraquinonylenediimino) di-, disodium salt Classification Azobenzene Empirical C32H28N2Na208S2 Properties Dk. blue m.w. 678.68 Toxicology Irritating to eyes TSCA listed Precaution Incompat. with strong oxidants Hazardous Decomp. Prods. Irritating and toxic fumes and gases... 

MES. See Methyl ethyl sulfide Mesitol, a,a, a"-trls (dimethylamino)-. See 2,4,6-Tris (dimethylaminomethyl) phenol Mesitylene. See 1,3,5-Tri methyl benzene Mesitylene, 2-benzoyl-. See 2,4,6-Trimethylbenzophenone 2-Mesitylenesulfonic acid, 4,4 -(1,4-anthraquinonylenediimino) di-, disodium salt. See Acid blue 80 Mesityl oxide... 

Trimethylbenzenesulfonic acid dimethylazanyl ester [A,A -dimethyl-C)-(benzenesulfonyl)hydroxylamine, 41] reacts with organomagnesiums, organolithiums, and enolates to afford metal/dimethylamino displacement products in moderate yield (Scheme 1-33)J The related 2,4,6-trimethylbenzenesulfonic acid bis(trimethylsilyl) azanyl ester [0-mesitylenesulfone-l-A -bis(trimethylsilyl)hydroxylamine, 42] readily transfers the doubly silylated amino entity to a series of lithium acetylides, thus, opening an attractive entry to protected yneamines (Scheme 1-33)J Unfortunately, no reactions with alkyl- and aryllithiums have yet been reported. 

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