A Quaternary centre in
For example, in the following reaction, the
R3N + R-Cl → R4N+ Cl-
ee also
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Quaternary (disambiguation) — Quaternary (from Latin quaternarius ) is an adjective meaning consisting of or containing four each , but sometimes (as in geology) taken to mean fourth or fourth hand , where it is used in place of quartary to continue the sequence Primary,… … Wikipedia
Quaternary ammonium cation — Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR4+ with R being alkyl groups. Unlike the ammonium ion NH4+ itself and primary, secondary, or tertiary ammonium cations, the quaternary… … Wikipedia
quaternary — /kwot euhr ner ee, kweuh terr neuh ree/, adj., n., pl. quaternaries. adj. 1. consisting of four. 2. arranged in fours. 3. (cap.) Geol. noting or pertaining to the present period of earth history, forming the latter part of the Cenozoic Era,… … Universalium
quaternary — [kwə tə:n(ə)ri] adjective 1》 fourth in order or rank. 2》 (Quaternary) Geology relating to or denoting the most recent period in the Cenozoic era, following the Tertiary period (comprising the Pleistocene and Holocene epochs and beginning 1.64… … English new terms dictionary
Unsolved problems in chemistry — tend to be questions of the kind Can we make X chemical compound? , Can we analyse it ? , Can we purify it ? and are commonly solved rather quickly, but may just as well require considerable efforts to be solved. However, there are also some… … Wikipedia
Salt (chemistry) — This article is about the term as used in chemistry. For the chemistry of table salt, see Sodium chloride. The blue salt copper(II) sulfate in the form of the mineral chalcanthite In chemistry, salts are ionic compounds that result from the… … Wikipedia
Amine — For other uses, see Amine (disambiguation). Primary amine Secondary amine Tertiary amine … Wikipedia
Crystal structure of boron-rich metal borides — Two single crystals of YB66 (1 cm diameter) grown by floating zone technique using (100) oriented seeds. In the top crystal, the seed (left from the black line) has same diameter as the crystal. In the bottom crystal (sliced), the seed is much… … Wikipedia
amine — aminic /euh mee nik, euh min ik/, adj. aminity /euh min i tee/, n. /euh meen , am in/, n. Chem. any of a class of compounds derived from ammonia by replacement of one or more hydrogen atoms with organic groups. [1860 65; AM(MONIUM) + INE2] * * *… … Universalium
Chemical biology — is a scientific discipline spanning the fields of chemistry and biology that involves the application of chemical techniques and tools, often compounds produced through synthetic chemistry, to the study and manipulation of biological systems.… … Wikipedia
