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Depiction of a larrikin, from Nelson P. Whitelocke's book A Walk in Sydney Streets on the Shady Side (1885). Larrikin is an Australian English term meaning "a mischievous young person, an uncultivated, rowdy but good-hearted person", or "a person who acts with apparent disregard for social or political conventions".
In organometallic chemistry, a coordinatively unsaturated complex has fewer than 18 valence electrons and thus is susceptible to oxidative addition or coordination of an additional ligand. Unsaturation is characteristic of many catalysts. The opposite of coordinatively unsaturated is coordinatively saturated.
In organic chemistry, neighbouring group participation (NGP, also known as anchimeric assistance) has been defined by the International Union of Pure and Applied Chemistry (IUPAC) as the interaction of a reaction centre with a lone pair of electrons in an atom or the electrons present in a sigma or pi bond contained within the parent molecule but not conjugated with the reaction centre.
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
It appears that the commends in this article Apart from the etymology and evolution sections, this article smacks of point-of-view. Who decided that this list of people fit the criteria of a larrikin -- no references -- and none to be found I'll bet, certainly none to define larrikin in such clear terms as it is defined here.
For hydrocarbons, the DBE (or IHD) tells us the number of rings and/or extra bonds in a non-saturated structure, which equals the number of hydrogen pairs that are required to make the structure saturated, simply because joining two elements to form a ring or adding one extra bond (e.g., a single bond changed to a double bond) in a structure reduces the need for two H's.
Ring expansions can allow access to larger systems that can be difficult to synthesize otherwise. [6] Rings can be expanded by attack of the ring onto an outside group already appended to the ring (a migration /insertion), opening of a bicycle to a single larger ring, or coupling a ring closing with an expansion. [ 1 ]
In organic chemistry, an addition reaction is an organic reaction in which two or more molecules combine to form a larger molecule called the adduct. [1] [2] An addition reaction is limited to chemical compounds that have multiple bonds. Examples include a molecule with a carbon–carbon double bond (an alkene) or a triple bond (an alkyne).