A comparison of crystallographic and NMR data for thieno[2,3-b:4,5-b′]dipyridine and its monohydroperchlorate salt

X‐ray crystallographic studies of thieno[2,3‐b:4,5‐b′]dipyridine (1) and its monohydroperchlorate salt (1a) show that 1 is protonated at N1 in ring A and not at N6 in ring C. In each compound individual rings are planar, but there is a small dihedral angle‐of‐twist between the A and C rings. On goin...

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Bibliographic Details
Published in:Journal of heterocyclic chemistry 2000-07, Vol.37 (4), p.763-766
Main Authors: Klemm, Leroy H., Weakley, Timothy J. R., Yoon, Myungok, Clegg, Robert S.
Format: Article
Language:English
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Summary:X‐ray crystallographic studies of thieno[2,3‐b:4,5‐b′]dipyridine (1) and its monohydroperchlorate salt (1a) show that 1 is protonated at N1 in ring A and not at N6 in ring C. In each compound individual rings are planar, but there is a small dihedral angle‐of‐twist between the A and C rings. On going from 1 to 1a the largest changes in bond angles and bond lengths occur in ring A. 1H and l3C nmr spectra of 1 plus the 13C nmr spectrum of 1a are reported.
ISSN:0022-152X
1943-5193
DOI:10.1002/jhet.5570370416