Standardizing Mechanisms: Hydrobromination of Styrene in SMILES

Sulstice
1 min readJan 11, 2023

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Our goal is to start recording mechanisms in SMILES langauge that is intuitive for an organic chemist to write. A lot of the mechanisms I will be abstracting from are Reddit and will be going with what the community agrees is the standard way of arrow pushing. So this mechanism is from this post:

Let’s go ahead and write our variables pythonically:

styrene = 'C=CC1=CC=CC=C1'
hydrobromic_acid = '[H]Br'

The first step of the mechanism is is where the alkene acts as a nucleophile and attacks the electrophilic hydrogen. The ethyl benzene cation is produced on the secondary carbon with a bromine counter anion. Which we can represent as:

first_step_mechanism = 'C[CH+]C1=CC=CC=C1.[Br-]'

Finally our product is then:

product = 'CC(Br)C1=CC=CC=C1'

We can then record the full mechanism as where :

hydrobromination_of_styrene = {
'step_1': :'C=CC1=CC=CC=C1.[H]Br',
'step_2': 'C[CH+]C1=CC=CC=C1.[Br-]',
'step_3': 'CC(Br)C1=CC=CC=C1'
'''

If we record enough perhaps this can be a useful educational tool and dataset.

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Sulstice
Sulstice

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