Formamidinesulfinic acid

Formamidine, N,N -di-2-anthraquinonyI-metal complexes, 2,275 Formamidine, IV.AT-diaryl-metal complexes, 2, 275 Formamidine, N, N -dibenzyl-metal complexes, 2,276 Formamidine, IV.N -diisopropyl-metal complexes, 2, 276 Formamidinesulfinic acid technetium complexes, 6, 974 Formate dehydrogenases bacteria... 

As a new and practical synthesis of pyrroles, Zard and coworkers have presented the reduction of y-nitroketones with formamidinesulfinic acid (Eq. 10.3).5... 

A new method for the reductive conversion off-keto- -nitroesters to pyrroles involves the use of formamidinesulfinic acid (thiourea S,S-dioxide) as the reducing agent. <95TL9469> The ester substituent seems to be required since no reaction occurred with simple a-nitroketones. 

The -nitroketone 151, prepared by Michael addition of ethyl nitroacetate to the appropriate enone, reacts with formamidinesulfinic acid and triethylamine to afford pyrrole-2-carboxylate 153, presumably via the oxime or imine 152 (Scheme 80) <1995TL9469>. 

The reagent, also known as formamidinesulfinic acid, is prepared by oxidation of thiourea with hydrogen peroxide. ... 

These nitrogen analogs of sulfoxides and sulfones are still relatively unusual types of organosulfur compound but a few methods are known for their reduction. Colonna and coworkers, for example, found that A -tosylsulfimides could be reduced to sulfides in good yields, using formamidinesulfinic acid (thiourea 5,5-dioxide) (6) under phase-transfer conditions at 70 °C (equation 16). This reagent was later... 

Lang and Comasseto have shown that formamidinesulfinic acid, or thiourea dioxide (6), is an efficient and inexpensive reagent for reducing selenoxides and telluroxides, as well as various selenium(IV) halide derivatives, to the corresponding selenides and tellurides. 

Reduction of aromatic nitro groups with formamidinesulfinic acid Chatteijie, Nithiananda Minar, Arlene Clarke, Donald D. 

Formamidinesulfinic acid is commercially available and exists as the zwit-terion (formally the SO2 adduct of diaminocarbene), but fully alkylated derivatives, 17, Scheme 6, are apparently unknown. However it is interesting to note that, in a very old reaction, [50] imidazol-2-thiones are oxidized to imidazolium ions by nitric acid. Diaminocarbene-SO2 adducts and diaminocarbenes are likely intermediates. 

Preparative Methods by the oxidation of thiourea or amino-iminomethanesulfinic acid (formamidinesulfinic acid) with peracetic acid. Many substituted aminoiminomethanesulfonic acids can be prepared in the same way. 2 Others have utilized hydrogen peroxide with sodium molybdate as a catalyst to oxidize the corresponding thioureas to a variety of monosubsUtuted aminoiminomethanesulfonic acids the substituents include phenyl, 2-methylphenyl, 4-fluorophenyl, / -propyl, cyclohexylmethyl, S-a-methylbenzyl, cyclooctyl, and benzhydiyl. ... 

Alternate Names TUD formamidinesulfinic acid aminoimi-nomethanesulfinic acid. 

Formamidinesulfinic acid, F-00036 Levometiomeprazine, in M-00069 Diphenylacetic acid Anhydride, in D-00999 A -(2-Hydroxy-3-methoxybenzylidene)-2-hydroxyaniline, in D-00541... 

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