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A ring forming reaction or ring-closing reaction in organic chemistry is an umbrella term for a variety of reactions that introduce one or more rings into a molecule. A heterocycle forming reaction is a reaction that introduces a new heterocycle. [1] [2] Important classes of ring forming reactions include annulations [3] and cycloadditions ...
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[2] [3] [13] [42] Ring-closing metathesis is important in total synthesis. One example is its use in the formation of the 12-membered ring in the synthesis of the naturally occurring cyclophane floresolide. Floresolide B was isolated from an ascidian of the genus Apidium and showed cytotoxicity against KB tumor cells.
It is common at amusement parks. [2] A variant, sometimes referred to as "ring-a-bottle", replaces pegs with bottles, where the thrower may keep the bottle (and its contents) if successful. [3] Ring toss is also a game for toddlers and children that can assist in the development of motor skills and hand-eye coordination development. [4] [5]
An Aerobie ring. An Aerobie is a flying ring used in a manner similar to a chakram or flying disc (Frisbee), for recreational catches between two or more individuals. Its ring shape of only about 3 mm (0.12 in) thickness [1] makes the Aerobie lighter and more stable in flight than a disc. [2] It can be bent to tune it for straighter flight. [3]
A ring spinning machine in the 1920s. Ring spinning is a spindle-based method of spinning fibres, such as cotton, flax or wool, to make a yarn. The ring frame developed from the throstle frame, which in its turn was a descendant of Arkwright's water frame. Ring spinning is a continuous process, unlike mule spinning which
[3] Ring strain energy is believed to be the cause of accelerated rates in altering ring reactions. Its interactions with traditional bond energies change the enthalpies of compounds effecting the kinetics and thermodynamics of ring strain reactions. [4] 1.1.1-Propellane (C 2 (CH 2) 3) is one of the most strained molecules known.
A homocycle or homocyclic ring is a ring in which all atoms are of the same chemical element. [1] A heterocycle or heterocyclic ring is a ring containing atoms of at least two different elements, i.e. a non-homocyclic ring. [2] A carbocycle or carbocyclic ring is a homocyclic ring in which all of the atoms are carbon. [3]