Improvements in the Manufacture of Periodides of Phenols and Phenol Carboxylic Acids.
Year: 1892

page_text: Date of Application, 25th Apr., 1892
Complete Specification Left, 20th Jan., 1893-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Periodides of Phenols and
Phenol Carboxylic Acids.
I BENJAMIN WILLCOX of 47 Lincoln's Inn Fields in the County of London
Patent Agent do hereby declare the nature of this invention (which has been
communicated to me from abroad by Farbenfabriken vormals Friedrich Bayer & Co.
of Elberfeld in the Empire of Germany) to be as follows:-
In the Specifications of Letters Patent No. 50798* 180210 and 7026"¹ descriptions
are given of iodoxyl derivatives of phenols which result from the treatment of the
alkaline solutions of the phenols with iodine or iodine salts or compounds, periodides
and the like.
My foreign correspondents have now discovered that these substances can be
easily and advantageously obtained by subjecting a mixture of the solutions of
alkaline phenolates (phenol alkalies) and alkaline iodides (iodine alkalies) to
electrolysis.
With this object the phenols in the quantity necessary to form a clear solution
are dissolved in a soda or potash lye; this solution is mixed with potassium iodide
or other alkaline iodide one, two three or four molecular proportions of alkaline
iodide being employed to each molecular proportion of phenol according as the
phenol takes up one, two, three or four atoms of iodide. The mixture is then
subjected to electrolysis.
The production of aristol may be taken, as an example-
Three parts (by weight) of thymol, 0.8 parts of sodium hydroxide and 7 parts of
potassium iodide are dissolved in 200 parts of water and the two electrodes of a
galvanic battery or other generator of electricity are placed in the liquid.
The strength of the electric current employed may be such as to be capable of
producing in the voltameter about 6.8 cubic centimeters of oxyhydrogen gas per
minute. The aristol separates immediately at the positive electrode and after the
electric current has acted for several hours completely fills the vessel. When all
the thymol has disappeared the current is immediately cut off, the precipitate
separated by filtration and dried. It consists of iodoxylised thymol (aristol) such
as is described in the Specification No. 50798.
The electrolytic bath may be stronger or weaker than that described in the fore-
going example without affecting the result finally obtained.
In like manner the corresponding iodine derivatives described in the Specifications
herein before referred to are obtained from mixtures of a solution of a potassium
salt of iodine with solutions of beta naphtholate of sodium, phenolate of sodium,
cresolate of sodium resorcinate of sodium, salicylate and cresotinate of sodium (as
two basic salts) carvacrolate of sodium, ethyl phenolate of sodium propyl phenolate
of sodium, amyl phenolate of sodium, para isobutyl phenolate of sodium, para isobutyl
meta cresolate of sodium, paraisobutyl ortho cresolate of sodium, methyl and ethyl
ortho cresolate of sodium, propyl ortho cresolate of sodium, amyl ortho cresolate
of sodium, methyl meta cresolate of sodium, ethyl meta cresolate of sodium, propyl
meta cresolate of sodium, or amyl meta cresolate of sodium.
Dated this 25th day of April 1892.

page_text: acids is subjected to this process the basic salt thereof containing two atoms of
sodium, postassium or the like is employed.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
-
The process for producing iodine derivatives of phenol, cresol, resorcinol, thymol,
carvacrol, betanaphthol, phenol carboxy acids (such as salicylic acid, or cresotinic
acid) ethyl-phenol, propyl-phenol, amyl-phenol, para-isobutyl-phenol, methyl-ortho-
cresol, ethyl-ortho-cresol, propyl-ortho-cresol, para-isobutyl-ortho-cresol, amyl-
ortho-cresol, methyl-meta-cresol, ethyl-meta-cresol, propyl-meta-cresol, para-
isobutyl-meta-cresol, or amyl-meta-cresol, by subjecting solutions of the alkaline
salts of these compounds together with solutions of alkaline iodides to electrolysis.
Dated this 20th day of January 1893.
B. WILLCOX.