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However, checking the solution this question, they have also added the increment for an exocyclic double bond, and have got the answer to be 273 nm 273 n m instead. As far as I know, an exocyclic double bond means exo + cyclic, where exo means "outside" and cyclic means, well "cyclic", or more simply, a double bond that is outside the ring.
A double bond is formed when two atoms share two pairs of electrons. The sharing of two electrons is known as a covalent bond. Double bonds are both stronger and shorter than single bonds.
However, according to the italicised portion of the quoted text, the double bond is considered to have the higher priority, and the name would correctly be pent-1-en-4-yne. Note that the final "-e" from "-ene" is dropped if the following suffix begins with a vowel or "y," and is retained if the suffix begins with a consonant.
A crossed double bond has sometimes been used to indicate unspecified double bond configuration or a mixture of configurations. This type of bond is not considered acceptable for general use, although it may still be required by some computer software. There's still missing piece of information about which software and by what means it ...
When discussing the Wittig reaction, Clayden's Organic Chemistry (2nd ed.) cites the strength of the P=O bond formed in triphenylphosphine oxide as a driver of the reaction through enthalpy: The P=O bond, with its bond energy of 575 kJ mol −1, is one of the strongest double bonds in chemistry, and the Wittig reaction is irreversible and is ...
A double bond is formed when two atoms share two pairs of electrons. The sharing of two electrons is known as a covalent bond. Double bonds are both stronger and shorter than single bonds.
If there is a double bond conjugated with the carbonyl group, $\ce{LiAlH4}$ doesn't reduce it, leading to an allylic alcohol. However, using $\ce{NaBH4}$, some of the fully reduced alcohol will also be formed.
A dotted line indicates that the bond is not a full bond, it is only a partial bond as in a hydrogen bond or a partially formed or broken bond in a transition state. Also, as Mrigank Pawagi notes in the comments, the dotted line can be used along with the solid line to denote bonds that have partial double bond character due to resonance.
$\begingroup$ A cis-bond itself is a zig-zig (or U-shaped) while a trans-bond is zig-zag (just like a single bond in staggered antiperiplanar conformation). So yes, compared to the trans-bond you are swapping the single bonds to hydrogen and to the carbon on one side of the double bond. $\endgroup$ –
Molecular orbital theory for dicarbon, on the other hand, predicts a C-C double bond in $\ce{C2}$ with 2 pairs of electrons in $\pi$ bonding orbitals and a bond order of two. "The bond dissociation energies (BDE) of $\ce{B2, C2}$, and $\ce{N2}$ show increasing BDE consistent with single, double, and triple bonds."