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Catechol (/ ˈ k æ t ɪ tʃ ɒ l / or / ˈ k æ t ɪ k ɒ l /), also known as pyrocatechol or 1,2-dihydroxybenzene, is an organic compound with the molecular formula C 6 H 4 (OH) 2. It is the ortho isomer of the three isomeric benzenediols .
There are three structural isomers: 1,2-dihydroxybenzene (the ortho isomer) is commonly known as catechol, 1,3-dihydroxybenzene (the meta isomer) is commonly known as resorcinol, and 1,4-dihydroxybenzene (the para isomer) is commonly known as hydroquinone. [1]
In 1866, Henry Watts listed catechol as oxyphenic acid. [7] In 1867, August Kekulé called catechol bihydroxylbenzol (dihydroxybenzene). [8] By 1868, catechol was being listed as pyrocatechol. [9] By 1879, the Journal of the Chemical Society was recommending that catechol be called "catechol", and in the following year, it was listed as such ...
Title: Year: Catholicon - purported first French dictionary: 1499 Thresor de la langue françoyse tant ancienne que moderne (): 1606 Dictionnaire de l'Académie française: 1694 to present
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Their investigation constitutes a major chapter in the history of physiology, biochemistry, and pharmacology. Adrenaline was the first hormone extracted from an endocrine gland and obtained in pure form, before the word hormone was coined. [2] Adrenaline was also the first hormone whose structure and biosynthesis was discovered.
en bloc as a group. en garde "[be] on [your] guard". "On guard" is of course perfectly good English: the French spelling is used for the fencing term. en passant in passing; term used in chess and in neurobiology ("synapse en passant.") En plein air en plein air lit. "in the open air"; particularly used to describe the act of painting outdoors ...
University of Chicago, The ARTFL Project, Dictionnaires d'autrefois, Full text, searchable French dictionaries of the 17th, 18th, 19th and 20th centuries.Includes: Dictionnaire de L'Académie française: 1st (1694), 4th (1762), 5th (1798), 6th (1835), and 8th (1932–5) editions; Jean Nicot's Thresor de la langue française (1606), Jean-François Féraud's Dictionaire critique de la langue ...