CIP (Cahn-Ingold-Prelog) priority: R/S from S₄-permutation parity

Layer 2 — Chemistryin the chemical-nomenclature subtree

Cahn-Ingold-Prelog stereodescriptors (Cahn, Ingold, Prelog 1956 / 1966). For a tetrahedral stereocenter with four distinct substituents, rank them by atomic-number-first (Z); break ties by mass-number (A); break further ties by…

Related concepts

Permutation P(n,k)
Symmetric group S_n
CIP parity: cyclic σ=(0 1 2) sgn=+1 (S); transposition sgn=−1 (R)

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