Tetrakis lead

Lead, (2-furyl)trimethyl- C NMR, 4, 565 (74AJC417) Lead, tetrakis(2-furyl)- C NMR, 4, 567 (74AJC417)... 

Finally, oxidative cleavage of the remaining aryl-silicon bond with lead tetrakis(trifluoroacetate), [Pb(OCOCF3)4]19, furnishes ( )-estrone [( )-1 ] in nearly quantitative yield. 

Lead, tetrakis(acetato)- [-], 59,147 L-Leucine, methyl ester, hydrochloride [7517-19-3],56, 89 N- [A - [(phenylmethoxy)carbonyl] -L-phenylalanyl] -, methyl ester [3850-45-1],56, 93... 

Lead tetrakis(trifluoroacetate), Pb(OCOCF3)4, which is prepared from red lead oxide (Pb304), trifluoroacetic acid, and trifluoroacetic anhydride [435], has very limited applications. It converts alkylbenzenes into benzylic trifluoroacetates [435] and benzene and its derivatives into phenyl trifluoroacetates [435, 449]. 

Like the acyloxylation with peroxides, the treatment of benzene homologues and derivatives with lead tetrakis(trifluoroacetate) gives mixtures of ortho, meta, and para isomers, with the para isomers predominating [449],... 

More frequently, the benzylic hydrogen is replaced by an acyloxy group on refluxing with ceric ammonium nitrate in 100% acetic acid [415], with lead tetraacetate [434, 437], or with lead tetrakis(trifluoroacetate) [435]. 

Aryltrimethylsilanes react also with lead tetraacetate or lead tetrakis(trifluoroacetate), in trifluoroacetic acid, to yield the corresponding aryllead tris(trifluoroacetate), which again can further react with TFA to lead to the aryltrifluoroacetates. l 5... 

Reaction with allylic and homoallylic hydroxysteroids. Westphal and Zbiral have reported the reaction of lead tetrakis(trifluoroacetate) with a number of unsaturated hydroxy steroids. 

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