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A group of the structure R 2 C=C=CR− is called allenyl, while a substituent attached to an allene is referred to as an allenic substituent (R is H or some alkyl group). In analogy to allylic and propargylic , a substituent attached to a saturated carbon α (i.e., directly adjacent) to an allene is referred to as an allenylic substituent.
Propadiene (/ p r oʊ p ə ˈ d aɪ iː n /) or allene (/ ˈ æ l iː n /) is the organic compound with the formula H 2 C=C=CH 2. It is the simplest allene, i.e. a compound with two adjacent carbon double bonds. [3] As a constituent of MAPP gas, it has been used as a fuel for specialized welding.
Propyne exists in equilibrium with propadiene, the mixture of propyne and propadiene being called MAPD: = = The coefficient of equilibrium K eq is 0.22 at 270 °C or 0.1 at 5 °C.
Propadiene, an allene Index of chemical compounds with the same molecular formula This set index page lists chemical structure articles associated with the same molecular formula .
Aromatic compounds are often drawn as cyclic alkenes, however their structure and properties are sufficiently distinct that they are not classified as alkenes or olefins. [3] Hydrocarbons with two overlapping double bonds ( C=C=C ) are called allenes —the simplest such compound is itself called allene —and those with three or more ...
Lewis structure of a water molecule. Lewis structures – also called Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs) – are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
The skeletal formula of the antidepressant drug escitalopram, featuring skeletal representations of heteroatoms, a triple bond, phenyl groups and stereochemistry. The skeletal formula, line-angle formula, bond-line formula or shorthand formula of an organic compound is a type of molecular structural formula that serves as a shorthand representation of a molecule's bonding and some details of ...
The Crabbé reaction (or Crabbé allene synthesis, Crabbé–Ma allene synthesis) is an organic reaction that converts a terminal alkyne and aldehyde (or, sometimes, a ketone) into an allene in the presence of a soft Lewis acid catalyst (or stoichiometric promoter) and secondary amine.