Nuclear magnetic resonance studies of internal rotation—III  Rotational barriers in  META ‐ and  PARA ‐substituted  N ,  N ‐dimethylcinnamamides | Zendy

Spassov S. L. | Zendy; Dimitrov V. S. | Zendy; Agova M. | Zendy; Kantschowska I. | Zendy; Todorova R. | Zendy

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Nuclear magnetic resonance studies of internal rotation—III Rotational barriers in META ‐ and PARA ‐substituted N , N ‐dimethylcinnamamides

Author(s) -

Spassov S. L.,

Dimitrov V. S.,

Agova M.,

Kantschowska I.,

Todorova R.

Publication year - 1971

Publication title -

organic magnetic resonance

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0030-4921

DOI - 10.1002/mrc.1270030509

Subject(s) - substituent , internal rotation , rotation (mathematics) , polar , nuclear magnetic resonance , conjugated system , chemistry , line (geometry) , resonance (particle physics) , computational chemistry , atomic physics , physics , stereochemistry , mathematics , geometry , quantum mechanics , polymer , engineering , mechanical engineering

The rotational barriers about the CN bond of eight m ‐ and p ‐substituted N , N ‐dimethyl cinnamamides have been determined by the iterative total line shape NMR method. The ΔG 298·2 −≠values have been correlated with the substituent constants σ, σ n and σ + . By comparison of the results with literature data, some conclusions about the accuracy of the barrier determination as well as the transmittance of polar effects in conjugated amides have been drawn.

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