Curly arrow notation

Using curly arrow notation, write an equation for (a) the homolytic fission of bromine and (b) the heterolytic fission of hydrogen chloride. 

For a short video on bond fission and curly arrow notation visit www. brightredbooks.net... 

Currently accepted mechanisms. We have tried to be complete in showing steps, intermediates and the necessary curly arrow notations. 

The chlorine would form the chloride anion, while the hydrogen would form the hydrogen cation. Draw a representation of this bond cleavage using the curly arrow notation introduced above. 

Use curly arrow notation to bookkeep electron flow from substrate structures to intermediates to final product structures. 

Fig. 3 Representation of Lewis structures based on the attainment of closed shells by electron-pair sharing. The initial dot structures have been progressively replaced by line structures to represent the two-electron two-centre bonds. Dots are only retained when they have stereochemical consequences or are required to represent organic reactions using the curly arrow notation (see Fig. 4)...

Fig. 9 Canonical forms which illustrate how the curly arrow notation may be used for organo-metallic compounds...

They distinguished the molecule "in repose" from the molecule in action. They also suggested use of circled + and - symbols to indicate "tendency" to charge rather than actual charge. As we will see later, the "curly arrow" and the d + /d-notation, not their symbols, were to accomplish this notation. Prevost and Kirrmann, "Essai," 201, 208210. 

Lewis structures could be used to represent organic reactions, and the resulting curly arrow representation, which may be viewed as an extension of the Sidgwick dative bond, is universally accepted and used to describe the mechanistic pathways of organic reactions. Figure 4 gives some specific examples of the notation as it is used in organic chemistry today. 

F. 2 Energy transfta and upconversion emission mechanisms in a NaYp4 nanocrystal doped with Yb, Er, and Tm doped under 980-nm excitatirai. The dashed-dotted, dotted, curly, and full arrows refer to photon excitation, enCTgy transfer, multi-photrai relaxation, and upconversion emission. The notation applied to label the f oiergy states represent the spin (S), orbital (L),... 

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