What are states of hybridization in homodesmotic reactions?

1 Answer
Ernest Z.
Dec 26, 2014

States of hybridization in a homodesmotic reaction refer to whether the bonds are #sp³#, #sp²#, or #sp# hybridized.

The products and reactants in homodesmotic reactions must also have equal numbers of each type of carbon-carbon bond: #C_(sp^3)"-"C_(sp^3) #, #C_(sp^3)"-"C_(sp^2) #, #C_(sp^3)"-"C_(sp) #, #C_(sp^2)"-"C_(sp^2) #,#C_(sp^2)"-"C_(sp) #, #C_(sp)"-"C_(sp) #, #C_(sp^2)"="C_(sp^2) #, #C_(sp^2)"="C_(sp) #, #C_(sp)"≡"C_(sp)#.

An example illustrating this definition is the reaction

www.cup.uni-muenchen.de

The reactants and products contain equal numbers of bonds between carbons in the same state of hybridization and hydrogens bound to identical atom types.

#C_(sp^3)"-"C_(sp^2) # = 1

#C_(sp^2)"-"C_(sp^2) # = 1

#C_(sp^2)"-"C_(sp) # = 1

#C_(sp^2)"="C_(sp^2) # = 3

#C_(sp)"≡"C_(sp) # = 1

#C_(sp^3)H_3# = 1

#C_(sp^2)H_2 # = 3

#C_(sp^2)H # = 2

#C_(sp)H# = 1

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