Benzo furoxans

Linnett and Rosenberg have discussed the electronic structure of a number of nitroso and potential nitroso systems, including benzo-furoxans, using the non pairing approach. ... 

In general, two low-energy band systems appear, which in benzo-furoxan itself are strongly overlapping. In substituted compounds,... 

The first evidence for an unsymmetrical structure for the benzo-furoxan molecule and for the tautomerism of Eq. (3) was provided in 1961 by several groups of workers," using proton resonance... 

The utility of the method depends on the availability of the dioxime precursors. When the parent quinone is readily accessible, direct oximation provides a straightforward approach which has been used for the acenaphtho- and phenanthro-furazans, (22) and (94 n= 0), although in the former case mild conditions (SOCl2, 20 °C) are required for the subsequent cyclodehydration in order to avoid fragmentation of the product (73JOC1054) (see Section 4.22.3.1.1). o-Quinone dioximes can be generated by reduction of benzo-furoxans, but in many such cases direct deoxygenation to the benzofurazan is also possible. 

Benzofnroxan 3-Cyan-2-hydroxy- -1,4-bis-oxid E9b/2, 220 (Benzo-furoxan 4- NC —CH2—COOR)... 

Benzene-1.3,5-triol (phloroglucinol) undergoes reaction with benzofuroxan in methanol with a primary amine as base to give phenazine-l,3-diol 5,10-dioxide.Phenazine-2,3-diol 5,10-dioxides are also synthesized by the reaction of benzene-1,2,4-triol with 6-substituted benzo-furoxans. ... 

Furoxans have been recommended for use as accelerators of sensitized photographic emulsions,528 and as oxidants in color formers.529 Benzo-furoxan, when added to photopolymerizable printed circuit compositions, is said to improve the definition of the image.530 It is also beneficial as a constituent of carbon paper coatings.531 Some substituted benzofuroxans are proposed as inhibitors of styrene polymerization,532 and other furoxans suppress the formation of films on drying oils.280... 

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