Nirupam J. Trivedi

Nafion-HR catalyzed baeyer-villiger oxidation and ritter reaction[1]☆

Abstract Nafion-H, a perfluorinated resinsulfonic acid, is shown to be an effective catalyst for the Baeyer-Villiger oxidation of ketones to lactones in the presence of either 30% H 2 O 2 or meta-chloroperbenzoic acid, as well as for the Ritter reaction of alcohols in the presence of nitriles to give the corresponding amido compounds.

Superacidic FSO3H/HF catalyzed butane isomerization [1]

Superacid catalyzed isomerization of butane was studied. Highly efficient isomerization of butane to 2-methylpropane (isobutane) was achieved using fluorosulfuric acid containing up to 5% of hydrogen fluoride acting as a protic co-acid. The isomerization when carried out in excess FSO3H at 21 ° C in a flow system gave ∼70% conversion to 2-methylpropane with generally less than 3% cracking. When 2-methylpropane was isomerized under similar conditions about 12% butane was formed. Attempted isomerization of pentane and hexane with prolonged reaction times in a static system results in predominant protolytic cleavage (cracking).

La regioselettività della nitrazione elettrofila degli α, α, α-trialogenometossibenzeni

Nitration of α, α, α-trihalomethoxybenzenes with nitronium tetrafluoroborate or methyl nitrate/boron trifluoride in nitromethane solution was studied and compared to that of halobenzenes. Predominantpara-substitution is observed with no formation ofmeta isomer. The substrate reactivity compared to benzene (determined in competition experiments) is 0.1 to 0.3.RiassuntoLa nitrazione degli α, α, α-trialogenometossibenzeni con nitronio tetra-fluoroborato o nitrato di metile/trifluoruro di boro in nitrometano è stata studiata e paragonata a quella degli alogenobenzeni. È stata osservata principalmente la para-sostituzione, senza formazione delľisomero meta. La reattività dei substrati relativa alla reattività del benzene è k(C6H5OCX3)/k(C6H6) = 0.1-0.3.La nitrazione degli α, α, α-trialogenometossibenzeni con nitronio tetra-fluoroborato o nitrato di metile/trifluoruro di boro in nitrometano e stata studiata e paragonata a quella degli alogenobenzeni. E stata osservata principalmente la para-sostituzione, senza formazione delľisomero meta. La reattivita dei substrati relativa alla reattivita del benzene e k(C6H5OCX3)/k(C6H6) = 0.1-0.3.