The carbon fluorine bond of the smaller molecules is formed in three principal ways : Fluorine replaces a halogen or hydrogen, or adds across a multiple bond.
22.
Carbon is also classed as an atmophile because it forms very strong multiple bonds with oxygen in carbon monoxide ( slowly oxidised in the atmosphere ) and carbon dioxide.
23.
The enhanced strength of a multiple bond versus a single ( sigma bond ) is indicated in many ways, but most obviously by a contraction in bond lengths.
24.
Also for this purpose we went multiple bonds in 1925 and 1926 to 5 % in the following year, 4.6 million to 4?% at 40 years.
25.
To solve this problem, the concept of resonance is used, and the molecule is represented by several contributing structures, each showing a possible distribution of single and multiple bonds.
26.
For molecules and polyatomic ions the coordination number of an atom is determined by simply counting the other atoms to which it is bonded ( by either single or multiple bonds ).
27.
It is also possible to record decoupled 19 F { 1 H } and 1 H { 19 F } spectra and multiple bond correlations 19 F-13 C HMBC and through space HOESY spectra.
28.
This particular reaction demonstrated fantastic catalytic efficiency and would trigger a flurry of research into the use of phosphinegold ( I ) complexes for the activation C-C multiple bonds in the years to come.
29.
In molecules or ions that have a combination of one or more single and multiple bonds, often the " exact " position of the respective bonds cannot be indicated by a single Lewis structure.
30.
While the addition to the electron-rich alkenes and alkynes is mainly electrophilic, the nucleophilic addition plays an important role for the carbon-heteroatom multiple bonds, and especially its most important representative, the carbonyl group.
