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2 thoradh

  1. INDUSTRY|chemistry|chemical compound
    comhdhúil aramatach Tagairt "Rialachán Cur Chun Feidhme (AE) 2021/447 lena gcinntear luachanna tagarmhairc athbhreithnithe maidir le lamháltais astaíochtaí a leithdháileadh saor in aisce le haghaidh na tréimhse ó 2021 go 2025 de bhun Airteagal 10a(2) de Threoir 2003/87/CE ó Pharlaimint na hEorpa agus ón gComhairle, CELEX:32021R0447/GA Faomhadh an téarma seo mar chuid de Thionscadal Lex"
    ga
    Aromaten | aromatische Verbindung
    de
    Sainmhíniú Stoffklasse ungesättigter chemischer Verbindungen in der organischen Chemie, die sich durch eine besondere Bindungsstruktur (planares Ringsystem mit Doppelbindungen) auszeichnet Tagairt "Council-DE in Anl. an Die Chemie.Schule > Aromaten (7.7.2022)"
    Nóta der Name geht auf den aromatischen Geruch der zuerst entdeckten Verbindungen dieser Stoffklasse zurück. Benzol ist die einfachste aromatische Verbindung, mit dem alle anderen Aromaten durch die Struktur verwandt sind.
    aromatic compound | aromatic
    en
    Sainmhíniú any of a large class of unsaturated chemical compounds characterized by one or more planar rings of atoms joined by covalent bonds of two different kinds Tagairt "'aromatic compound' (10.5.2022), Encyclopædia Britannica"
    Nóta 1. A cyclically conjugated molecular entity with a stability (due to delocalization ) significantly greater than that of a hypothetical localized structure (e.g. Kekulé structure ) is said to possess aromatic character. If the structure is of higher energy (less stable) than such a hypothetical classical structure, the molecular entity is 'antiaromatic'. The most widely used method for determining aromaticity is the observation of diatropicity in the 1H NMR spectrum.2. The terms aromatic and antiaromatic have been extended to describe the stabilization or destabilization of transition states of pericyclic reactions The hypothetical reference structure is here less clearly defined, and use of the term is based on application of the Hückel (4n + 2) rule and on consideration of the topology of orbital overlap in the transition state. Reactions of molecules in the ground state involving antiaromatic transition states proceed, if at all, much less easily than those involving aromatic transition states.
    composé aromatique | aromatique
    fr
    Sainmhíniú molécule présentant un ou plusieurs cycles, c'est-à-dire que les atomes sont arrangés de façon à former une structure cyclique plane, et présentant souvent une odeur forte Tagairt "COM-FR d'après le site Futura Sciences > Aromatique: qu'est-ce que c'est? (9.6.2022)"
    Nóta Les composés aromatiques sont employés comme solvants pour la formulation de peintures et de vernis et servent également à l’élaboration de nombreux produits phytosanitaires, de polymères divers et variés ou de parfums et d’arômes pour les secteurs des cosmétiques et de l’agroalimentaire. Le benzène, le toluène et les xylènes sont les trois composés aromatiques de base majoritairement employés par l’industrie.
  2. INDUSTRY|chemistry|chemical compound
    hidreacarbón aramatach Tagairt "Rialachán (CE) Uimh. 1099/2008 maidir le staidreamh i dtaca le fuinneamh, CELEX:32008R1099/GA ;Faomhadh an téarma seo mar chuid de Thionscadal Lex"
    ga
    hideacarbón aramatach Tagairt an Ghníomhaireacht Eorpach Comhshaoil (GEC)
    ga
    aromatischer Kohlenwasserstoff
    de
    aromatic hydrocarbon | hydrocarbons | aryl hydrocarbon | aromatic compound | arene
    en
    Sainmhíniú "any of a large class of unsaturated chemical compounds characterized by one or more planar rings of atoms joined by covalent bonds [IATE:1552759 ] of two different kinds" Tagairt "COM-EN, based on: Encyclopaedia Britannica. Aromatic compoundchemical compound. Francis A. Carey, https://www.britannica.com/science/aromatic-compound [13.2.2018]"
    Nóta "The term 'aromatic' was assigned before the physical mechanism determining aromaticity was discovered, and was derived from the fact that many of the compounds have a sweet scent. The configuration of six carbon atoms in aromatic compounds is known as a benzene ring, after the simplest possible such hydrocarbon, benzene [ IATE:1566036 ]. Aromatic hydrocarbons can be monocyclic (MAH) or polycyclic (PAH)."
    hydrocarbure aromatique
    fr
    Sainmhíniú hydrocarbure cyclique comportant au moins un cycle benzénique Tagairt Manuila,A.,et al.,Dictionnaire français de médecine et de biologie,1972,Masson,Paris