Abstract The quaternary salts formed by reaction of tolyl sultone (2, 1, 3H-benzoxathiole-1, 1- dioxide) with 2-(1, 3-dioxolan-2-yl)-or 2-(2-methyl [1, 3] dioxolan-2-yl) pyridine may be cyclized in acid to afford the betaines derived from 7-sulfo-and 7-sulfo-11-methylacridizinium hydroxides. Similarly 1-(1, 3-dioxolan-2-yl) isoquinoline may be converted to the betaine of 9- sulfobenzo [a] acridizinium hydroxide.
![2-[[2-(1,3-dioxolan-2-yl)-2H-pyridin-1-yl]methyl]benzenesulfonic acid Structure](https://image.chemsrc.com/caspic/203/3340-21-4.png)