TY - JOUR

T1 - Probing the Anomeric Effect in OCN Systems Theory vs. Experiment

T2 - MO‐ab initio Calculations and a Structural‐Statistical Analysis

AU - Senderowitz, Hanoch

AU - Aped, Pinchas

AU - Fuchs, Benzion

PY - 1990/12/12

Y1 - 1990/12/12

N2 - A combined computational (MO ab initio) and structural‐statistical study of molecules containing the OCN moiety is presented. Aminomethanol, the simplest member of this series, was computed using GAUSSIAN‐82 with the 3‐21G and 6‐31G* basis sets and with complete geometry optimization, as well as with MP3//6‐31G*. A set of carefully selected molecules containing the OCN unit was retrieved from the Cambridge Structural Database (CSD), and its structural parameters were analyzed according to an established procedure. Comparison between experimental and computational data was thus made possible. Results are consistent with the co‐existence of two unequal anomeric effects in this system: a strong nN‐σ*CO anomeric interaction, and a weak nπO‐σ*CN one. The ability of the two basis sets to reproduce the energies and structural characteristics of the stereoelectronic effects is assessed, including the significance of using polarization functions and the inclusion of correlation energy.

AB - A combined computational (MO ab initio) and structural‐statistical study of molecules containing the OCN moiety is presented. Aminomethanol, the simplest member of this series, was computed using GAUSSIAN‐82 with the 3‐21G and 6‐31G* basis sets and with complete geometry optimization, as well as with MP3//6‐31G*. A set of carefully selected molecules containing the OCN unit was retrieved from the Cambridge Structural Database (CSD), and its structural parameters were analyzed according to an established procedure. Comparison between experimental and computational data was thus made possible. Results are consistent with the co‐existence of two unequal anomeric effects in this system: a strong nN‐σ*CO anomeric interaction, and a weak nπO‐σ*CN one. The ability of the two basis sets to reproduce the energies and structural characteristics of the stereoelectronic effects is assessed, including the significance of using polarization functions and the inclusion of correlation energy.

UR - http://www.scopus.com/inward/record.url?scp=0001122784&partnerID=8YFLogxK

U2 - 10.1002/hlca.19900730807

DO - 10.1002/hlca.19900730807

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AN - SCOPUS:0001122784

SN - 0018-019X

VL - 73

SP - 2113

EP - 2128

JO - Helvetica Chimica Acta

JF - Helvetica Chimica Acta

IS - 8

ER -