diphenylmethane

Other nonbarbiturate sedatives-hypnotics include (1) glycol or glycerol derivatives (e.g., meprobamate) and (2) diphenylmethane derivatives (e.g., diphenhydramine, hydroxyzine).

The Neuropsychiatric Guide to Modern Everyday Psychiatry Michael Alan Taylor 1993

These investigators found that by the condensation of phenols and hydroxybenzoic acids with formaldehyde, diphenylmethane derivatives were formed; pyrogallol yields hexahydroxydiphenylmethane --

Synthetic Tannins Georg Grasser

Nierenstein considers this reaction analogous to the formation of cork, to the genetic relation of which with the diphenylmethane formation Drabble and Nierenstein have referred in an earlier publication.

Synthetic Tannins Georg Grasser

With the introduction of the carboxylic group the tendency of condensation to diphenylmethane derivatives is lessened; by protocatechuic acid the tendency is nil.

Synthetic Tannins Georg Grasser

Dekker [Footnote: "De Looistoffen," vol. ii, p. 30 (1908).] was, however, unable to detect diphenylmethane on distilling with zinc dust, and did, therefore, not accept Nierenstein's views.

Synthetic Tannins Georg Grasser

With gelatine and aniline hydrochloride it exhibits reactions similar to those given by the diphenylmethane condensation products; its tanning properties also are similar to those of the latter.

Synthetic Tannins Georg Grasser

Nierenstein (see above), however, emphasises that the high molecular weight and the optical activity speak against the digallic acid formula, but in favour of this are the following points: (1) the decomposition of tannin with the formation of gallic acid; (2) the decomposition of methylotannin with the formation of di - and trimethyl esters of gallic acid; and (3) the production of diphenylmethane on distillation with zinc dust.

Synthetic Tannins Georg Grasser

In the benzene series this reaction is difficult to establish, and has to be induced by distilling the particular dihydroxy-diphenylmethane at ordinary pressure.

Synthetic Tannins Georg Grasser

Effective today, there are no longer any restrictions on the company's ability to supply diphenylmethane diisocyanate

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