Figure 2.4.9.1

Allen, F. H.; Barnard, J. M.; Cook, A. P. F.; Hall, S. R.

doi:10.1107/97809553602060000730

International
Tables for
Crystallography
Volume G
Definition and exchange of crystallographic data
Edited by S. R. Hall and B. McMahon

pdf | chapter contents | chapter index | related articles

International Tables for Crystallography (2006). Vol. G. ch. 2.4, p. 51

Figure 2.4.9.1

F. H. Allen,^a ^* J. M. Barnard,^b A. P. F. Cook^b and S. R. Hall^c

^a Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, England,^bBCI Ltd, 46 Uppergate Road, Stannington, Sheffield S6 6BX, England, and ^cSchool of Biomedical and Chemical Sciences, University of Western Australia, Crawley, Perth, WA 6009, Australia
Correspondence e-mail: allen@ccdc.cam.ac.uk

Figure 2.4.9.1

Query substructure for conjugated ketones or thioketones. Atom C1 is sp³ hybridized (total number of attached hydrogen and non-hydrogen atoms = 4) and carries at least one hydrogen atom. Bond C3—C4 may be localized double (D), aromatic (A) or delocalized double (E) in CCDC conventions.