Accession Number : AD0250681

Title :   ELECTRON COUPLING OF PROTON SPINS IN HETEROCYCLIC MOLECULES. N-BENZYLTHIENO 3,2-B PYRROLE

Corporate Author : ILLINOIS UNIV AT URBANA WILLIAM A NOYES LAB

Personal Author(s) : GUTOWSKY, H.S. ; PORTE, A.L.

Report Date : 29 DEC 1961

Pagination or Media Count : 1

Abstract : THE HIGH-RESOLUTION PROTON MAGNETIC RESONANCE SPECTRUM OF THE FOUR PROTONS ATTACHED TO THE HETEROCYCLIC RINGS OF N-BENZYLTHIENO 3,2-B PYRROLE (I) HAS BEEN EXAMINED. THE SPECTRUM IS OF THE TYPE ABCD PERTURBED BY TWO NUCLEI X2 WHICH COUPLE WITH A, AND IT INVOLVES THREE LONG-RANGE PROTON-PROTON COUPLINGS, 0.5, 1.3 AND 0.3 CPS OVER FIVE, SIX, AND SIX BONDS RESPECTIVELY, WHICH CAN BE ACCOUNTED FOR ONLY BY PI ELECTRON INTERACTIONS. THE COUPLING CONSTANTS FOUND IN EACH OF THE RINGS IN I ARE COMPARED WITH THOSE FOR THIOPHENE AND PYRROLE. ANGULAR EFFECTS AS WELL AS ELECTRONEGATIVITY DIFFERENCES GOVERN THE COUPLING VIA SIGMA ELECTRONS IN HCCH GROUPS

Descriptors :   *NUCLEAR MAGNETIC RESONANCE, *NUCLEAR SPINS, *PYRROLES, ELECTRONS, HETEROCYCLIC COMPOUNDS, PROTONS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE