This content teaches how to determine the substitution pattern of a benzene ring from the aromatic-region signals of a proton (1H) NMR spectrum, within the domain of organic chemistry / structural elucidation via NMR spectroscopy. The core principle is that the number of ring substituents equals six (the total proton positions on an unsubstituted benzene ring) minus the total integration of the aromatic signals, and that the relative positions of substituents (ortho, meta, para) are distinguished by the resulting number of signals and their splitting patterns (multiplicity), which follow from spin-spin coupling between adjacent, chemically inequivalent protons and from molecular symmetry. This connects NMR signal counting/integration/splitting analysis to structural (partial-structure) determination, a foundational technique within spectroscopic structure elucidation in organic chemistry.
This content teaches how to determine the substitution pattern of a benzene ring from the aromatic-region signals of a proton (1H) NMR spectrum, within the domain of organic chemistry / structural el…