L disulfone

BDSA. See d -Diaminobiphenyl-l -disulfonic acid (BDSA) 3,3,4,4,Bcnzophcnonctctracaiboxylic dianhydride (BTDA), 297 Benzoxazine intermediates, 392 Benzoxazines, 391, 416-417... 

Ferrocene can readily be sulfonated by either sulfuric acid or chlorosulfonic acid in acetic anhydride (43, 123). The products, ferrocenesulfonic acid (XXV) and ferrocene-l,l -disulfonic acid (XXVI), are obtained together with products resulting from oxidation. 

Dimeric cyclopentadiene carboxylic acid results from the photolysis of ferrocene-l.l -dicarboxylic acid in alkaline solution 353>. Ferrocene-l.l -disulfonic acid forms (via its iron salt) [(CsHsSOa Fe] on irradiation in water 355>. 

A soln. of salicylaldehyde and methylenebis (ethyl sulfone) in toluene treated with 1.1 times the equimolar amount of piperidine, and refluxed in a flask fitted with a Dean-Stark trap until water separation ceases 2-ethylsulfonyl-benzofuran. Y 59.5%. F. e. and prepn. of l,2-ethylene-l,l-disulfones from aldehydes s. M. L. Oftedahl, J. W. Baker, and M. W. Dietrich, J. Org. Ghem. 30, 296 (1965). 

Dithiolane 1,1,3,3-tetroxides from spiro-l,l-disulfones Isolation of single labeled G-atoms... 

CasHaaSgOiiSg Oarbonyl-bis-[8-(3-amino-cinnamoylamino)-naphthol-(l)-disulfon> 8aure-(3.5)] 14 1757. 

Carbonyl-bi8- 8-[3-(3-ammo-anisoylamino)-benzolsulfamino]-naphthol (l)-disulfon saure-(3.6) 14 I 760. 

Without additional reagents Hydrazones from ketene mercaptals via l,2-ethylene-l,l-disulfones... 

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