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52.2 - If there is a choice in numbering, unprimed numbers are assigned to the system which has the lower-numbered point of attachment.Examples to Rule A-52.1
52.3 - If two identical hydrocarbon systems have the same point of attachment and contain substituents at different positions, the locants of these substituents are assigned according to Rule A-2.2; for this purpose an unprimed number is considered lower than the same number when primed. Assemblies of primed and unprimed numbers are arranged in ascending numerical order.Example to Rule A-52.2
52.4 - The name "biphenyl" is used for the assembly consisting of two benzene rings.Examples to Rule A-52.3
See Recommendations'93 R-2.4.4Examples to Rule A-52.4
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