Benzo-l,4-dioxanes

Benzodioxines. The reaction of benzo-l,4-dioxanes with NBS catalyzed by dibenzoyl peroxide results in 2,3-dibromo derivatives, which undergo denomination to benzo-l,4-dioxines when treated with sodium iodide in acetone (equation I).1... 

When 1,2-diphenols are used instead of o-cyano phenols, benzo-l,4-dioxanes ensue (83). These can be modified by acid activation of the hemiacetal and formation of the mixed acetal 84, now presenting five sites of functionality, offering extensive scope for further elaboration and increased diversity (Scheme 18.29). ... 

Secondary dopants, such as benzo-l,4-dioxan and quinoxaline, have been introduced and their action was... 

Benzo-l,4-dioxan-3-ones from ketenes and o-qiiinones... 

SYNS 2,3,7,8-czTEROCHLORODVc UBENZo-p-DWUOKSYNY (POLISH) DIOKSYNY (POLISH) DIOXIN (herbicide contaminant) DIOXINE NCI-C03714 TCDBD 2,3,7,8-TCDD 2,3,6,7-TETRACHLORODI-BENZO-p-DIOXIN 2,3,7,8-TETRACHLORODlBENZO-(b,e)(l,4)DIOXAN 2,3,7,8-TETRACHLORODIBENZO-p-DIOXIN 2,3,7,8-TETRACHLORODIBENZO-l,4-DIOXIN TETRADIOXIN... 

Benzo-l,3-dioxan-4-ones. Phenyl salicylates form cyclic acetals on reaction with HCHO and DABCO in chloroform. The corresponding methyl esters do not react. 

Benzo[6]naphtho[2,3- ][l,4]dioxan - Benzo[c]phenanthrene-3,4-dione... 

Oxidative benzo-l,3-dioxan-4-one ring closure 331. GH3O... 

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