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13 C, 15 N coupling constants in substituted 1,2,4‐triazines‐4‐ 15 N
Author(s) -
Braun S.
Publication year - 1976
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.1270080513
Subject(s) - coupling constant , pyridine , chemistry , crystallography , quinoline , pyrimidine , triazine , lone pair , stereochemistry , medicinal chemistry , physics , molecule , organic chemistry , particle physics
Abstract The 13 C, 15 N coupling constants in three 1,2,4‐triazine‐4‐ 15 N derivatives and in a substituted pyrimidine‐1‐ 15 N have been determined and are compared with those in pyridine and quinoline. Of special interest are the data of the 5‐(2‐dimethylamino‐1‐propenyl)‐3,6‐dimethyl‐1,2,4‐triazine‐4‐ 15 N, since one observes a characteristic alternation of the absolute value of J ( 13 C, 15 N) along the sidechain and a hitherto unobserved very large 13 C, 15 N coupling constant through four bonds of 3·9 Hz, the origin of which is attributed to the influence of the lone pair orbital on the 15 N at position 4.