sulphonic

University and here he discovered the first hydrazine base, phenylhydrazine and demonstrated its relationship to hydrazobenzene and to a sulphonic acid described by Strecker and

Emil Fischer - Biography 1966

Berthelot has also investigated the action of ordinary concentrated sulphuric acid on acetylene, and obtained various sulphonic derivatives.

Acetylene, the Principles of Its Generation and Use W. J. Atkinson Butterfield

Similarly, halogenated compounds and alcohols react with concentrated or fuming sulphuric acid forming sulphonic and hydrosulphonic acids respectively.

Synthetic Tannins Georg Grasser

All natural tannins are unaffected by this treatment, ligninsulphonic and other sulphonic acids cause opalescence.

Synthetic Tannins Georg Grasser

The sulphonic acid group may also be directly introduced either by concentrated, or by fuming sulphuric acid, or by elimination of halogen by the action of sodium or silver sulphite on the halogen derivatives of the aliphatic compounds.

Synthetic Tannins Georg Grasser

(CH_3) _2N·C_6H_4·N_2·C_6H_4SO_3Na, is the sodium salt of para-dimethylaminobenzene-azo-benzene sulphonic acid.

Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" Various

The following analyses of the isolated lignin sulphonic acid are cited:

Researches on Cellulose 1895-1900 C. F. Cross

The aromatic compounds form, as a rule, sulphonic acids with much greater facility.

Synthetic Tannins Georg Grasser

The author's application of the soda salt of the lignone sulphonic acid as a reducing agent in chrome-mordanting wool and woollen goods (D.R.P. 99,682) is more successful in practice, and its industrial development shows satisfactory progress.

Researches on Cellulose 1895-1900 C. F. Cross

Like other "strong" and "weak" acids this sulphonic acid exercises a strongly swelling influence on pelt.

Synthetic Tannins Georg Grasser