194
6 Construction of the Names of Complex Compounds
6.7.2.2.2
Propeller-like Molecules (Several Chirality Axes)
Structures of symmetry Dn can be viewed as n-bladed propellers where,
in a way, n screw fragments are grouped around a real or fictitious central unit. This category includes above all triaryl-element and comparable polyaryl-derivatives, doubly bridged biphenyls, and a number of
twisted molecules. Here again the apparent helicities can easily be determined by evaluating the 4-point figures imprinted into the structural
formulae.
{PP-Tris{2,6-dichlorophenyl)azane
Chern. Abstr.:
{P)-N,N-Bis{2,6-dichlorophenyl)-2,6-dichlorobenzenamine (or: .,. aniline)
(P)- or more precisely (P,P,P,P,P)Pentamesitylcyclopentadienide
3 This helicity descriptor should actually read (P,P,P) because in principle (though
never observed as yet) one phenyl group could also be rotated in the contrary sense,
thus leading to a (P,P,M) diastereomer.
6 Construction of the Names of Complex Compounds
6.7.2.2.2
Propeller-like Molecules (Several Chirality Axes)
Structures of symmetry Dn can be viewed as n-bladed propellers where,
in a way, n screw fragments are grouped around a real or fictitious central unit. This category includes above all triaryl-element and comparable polyaryl-derivatives, doubly bridged biphenyls, and a number of
twisted molecules. Here again the apparent helicities can easily be determined by evaluating the 4-point figures imprinted into the structural
formulae.
{PP-Tris{2,6-dichlorophenyl)azane
Chern. Abstr.:
{P)-N,N-Bis{2,6-dichlorophenyl)-2,6-dichlorobenzenamine (or: .,. aniline)
(P)- or more precisely (P,P,P,P,P)Pentamesitylcyclopentadienide
3 This helicity descriptor should actually read (P,P,P) because in principle (though
never observed as yet) one phenyl group could also be rotated in the contrary sense,
thus leading to a (P,P,M) diastereomer.