title: Substituted tetralins VI: Tentative assignment of absolute stereochemistry of 1-methyl-1-phenyl-1,2,3,4-tetrahydro-3-naphthoic acid and N,N,1-trimethyl-1-phenyl-1,2,3,4-tetrahydro-3-naphthylamine isomers.
abstract: The absolute configurations of the enantiomers of N,N,1-trimethyl-cis- and trans-1-phenyl-1,2,3,4-tetrahydro-3-naphthylamines (Ia and Ib) were assigned tentatively from the circular dichroism spectrum of a bridged ketone derived by cyclization of optically active 1-methyl-cis-1-phenyl-1,2,3,4-tetrahydro-3-naphthoic acid (IIa). Thus, (--)-IIa and the corresponding amine, (--)-Ia, were assigned the (2S, 4R)-configuration. Epimerization of (--)-IIa through its methyl ester yielded the trans-acid, (--)-IIb, which established the absolute configuration of (--)-IIb and the corresponding amine, (--)-Ib, as (2R, 4R).
mesh_terms: D002942:Circular Dichroism; D008968:Molecular Conformation; D009281:Naphthalenes / Q000138:chemical synthesis; D013237:Stereoisomerism; D013764:Tetrahydronaphthalenes / Q000138:chemical synthesis
chemical_list: D009281:Naphthalenes; D013764:Tetrahydronaphthalenes