Tolyl alkyl carbonates

Aromatic sabstitatma with peroxydicarbomttes. The reaction of toluene with peroxydicarbonates and CAN in acetonitrile at 60° gives tolyl alkyl carbonates in high yield ... 

The transfer of chirality from sulfur to carbon as well as the high stereoselectivity were explained by a preference of rearrangement through transition state 11a over lib due to steric interference between the p-tolyl and a-alkyl group. 

Johnson and McCants (161) were the first to show that the alkaline hydrolysis of alkoxysulfonium salts, obtained by 0-alkylation of sulfoxides, proceeds with inversion of configuration at sulfur. This method was employed to interconvert (/ )- and (5)-benzyl p-tolyl sulfoxides 37 as shown in Scheme 21. In contrast to the hydroxide anion, the chloride, bromide, and iodide anions as well as the nitrogen atom of pyridine react with chiral ethoxydiarylsulfonium salts, not at sulfur but at the a-carbon atom of the ethoxy group, yielding the starting sulfoxide with retained configuration (284). On the other hand, the nucleophilic attack of the fluoride anion is directed at sulfur as in the case of the hydroxide anion (285). 

Finally, the addition of the carbanion of 1-chloroalkyl p-tolyl sulfoxides 154 to carbonyl compounds gave the adducts 155, which were treated with alkyllithium such as f-C4H9Li to afford the one-carbon homologated carbonyls compounds 158, from their lithium enolate forms 157, having an alkyl group at the a-position, via the carbenoid /S-alkoxides 156 (equation 53) °. 

U Alkyl groups and further carbon functional groups. p-Tolyl derivative... 

Pradilla et al. have shown that simple p-tolyl vinyl sulfoxides undergo nucleophilic epoxidation with metal alkyl peroxides to give enantiopure sulfinyl oxiranes.138 This process takes place with fair to excellent diastereoselectivities. The same group recently reported the epoxidation of diastereomeric hydroxy vinyl sulfoxides, bearing an additional stereocenter adjacent to the reactive carbon-carbon double bond. Hydroxy vinyl sulfoxides 256 and 258 underwent epoxidation with lithium ferf-butyl peroxide with high anti selectivity. However, when potassium ferf-butyl peroxide was used, only hydroxy vinyl sulfoxide 256 showed anti... 

Our examples will first center on the complexes Ir(CO)(R)(R0L2X (R and R = H, alkyl, or aUcoxy L = PPhs or P(/ -tolyl)3 X = halide or H), which reductively eliminate a number of different products. The reactions are summarized in Table 11. The reactions described in Table 11 show that reductive elimination from Ir results in formation of different types of bonds. These reductive elimination reactions occur under very similar conditions, indicating that the nature of R and R does not significantly affect the rate. However, the coupling of two sp carbon centers does not occur. Theoretical studies have suggested that the directionality of the sp hybrid inhibits bond formation. ... 

Solution-polymerized SBR is made by termination-free, anionic/live polymerization initiated by alkyl lithium compounds. Other lithium compounds are suitable (such as aryl, alkaryl, aralkyl, tolyl, xylyl lithium, and ot/p-naphtyl lithium as well as their blends), but alkyl lithium compounds are the most commonly used in industry. The absence of a spontaneous termination step enables the synthesis of polymers possessing a very narrow molecular weight distribution and less branching. Carbon dioxide, water, oxygen, ethanol, mercaptans, and primary/secondary amines interfere with the activity of alkyl lithium catalysts, so the polymerization must be carried out in clean, near-anhydrous conditions. Stirred bed or agitated stainless steel reactors are widely used commercially. 

By far the most common approach to the 1,3-diazocine ring system has been and remains dependent on formation of the aminal functionality through condensation of appropriate one-carbon sources with diamines. Alkylation of a,(u-disulfonamides with methylene bromide affords modest yields (ca. 45%) of perhydrodiazocine derivatives (5 Ar=p-tolyl, phenyl) (Equation (7))... 

Stabilizers Screener carbon black, zinc oxide, talc Phenolic antioxidant ethylene-bis(oxyethylene)-bis(3-(5-tert-butyl-4-hydroxy-m-tolyl)-propionate) 2,6,-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5,-triazine-2-ylamino) phenol 2-(1,1-dimethylethyl)-6-[[3-(1,1 -dimethylethyl)-2-hydroxy-5-methylphenyl] methyl-4-methylphenyl acrylate 2 ,3-bis[[3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionyl]]propionohydrazide isotridec l-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate 3,5-bis(1,1-dimethyethyl)-4-hydroxy-benzenepropanoic acid, C13-15 alkyl esters 2,2 -isobutylidenebis(2,4-dimethylphenol) Phosphite trinonylphenol phosphite Thiosynergist 4,6-bis(octylthiomethyl)-o-cresol 4,6-bis(dodec lthiomethyl)-o-cresol 2,2 -thiodiethylene bis[3-(3,5-ditert-butyl-4-hydroxyphe-nyl)propionate] Amine nonylated diphenylamine ... 

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