Preferred Label : helicity;
IUPAC acronym : M;
IUPAC definition : The chirality of a helical, propeller or screw-shaped molecular entity. A right-handed
helix is described as i P /i (or plus), a left-handed one as i M /i (or minus).
The application of this system to the description of conformations considers the torsion
angle between two specified (fiducial) groups that are attached to the atoms linked
by that bond. The sign of the smaller torsion angle between the fiducial groups defines
the chirality sense of the helix. Rules for the selection of fiducial groups according
to priority are given by R.S. Cahn, C.K. Ingold and V. Prelog, i Angew. Chem /i .
i 78 /i , 413-447 (1966), i Angew. Chem. Internat. Ed. Eng /i . i 5 /i , 385-415,
511 (1966).;
Origin ID : H02763;
Automatic exact mappings (from CISMeF team)
- See also
The chirality of a helical, propeller or screw-shaped molecular entity. A right-handed
helix is described as i P /i (or plus), a left-handed one as i M /i (or minus).
The application of this system to the description of conformations considers the torsion
angle between two specified (fiducial) groups that are attached to the atoms linked
by that bond. The sign of the smaller torsion angle between the fiducial groups defines
the chirality sense of the helix. Rules for the selection of fiducial groups according
to priority are given by R.S. Cahn, C.K. Ingold and V. Prelog, i Angew. Chem /i .
i 78 /i , 413-447 (1966), i Angew. Chem. Internat. Ed. Eng /i . i 5 /i , 385-415,
511 (1966).
