19 Kryptoracemates
393
Fig. 19.13 Images for 5,14-dimethyl-4,13,19,20-tetraoxatricyclo[14.2.1.1 7,10 ]icosane-3,12-dione
(NUYTAC); 13: chemical diagram, molecular structure and overlay diagram
having R- and S-configurations in the molecule illustrated in Fig. 19.14. The molecule
crystallises in the monoclinic space-group P2 1 with Z
= 3. Two of the molecules have
the conformation shown in the molecular structure diagram of Fig. 19.14, and the third
molecule has the opposite, i.e. S- and R-configurations. Hence, there is a deviation
from the usual 1:1 enantiomeric ratio, hence the use of the term “unbalanced”. In
one sense, 14 can be considered a multi-component crystal of an enantiomeric pair
of 14 co-crystallised with a RS-diastereoisomer.
Fig. 19.14 Images for 2-[(dimethylamino)methyl]-1λ 4 ,3λ 4 -dithiolane-1,3-dione (VEFMEZ); 14:
chemical diagram, molecular structure and overlay diagram
393
Fig. 19.13 Images for 5,14-dimethyl-4,13,19,20-tetraoxatricyclo[14.2.1.1 7,10 ]icosane-3,12-dione
(NUYTAC); 13: chemical diagram, molecular structure and overlay diagram
having R- and S-configurations in the molecule illustrated in Fig. 19.14. The molecule
crystallises in the monoclinic space-group P2 1 with Z
= 3. Two of the molecules have
the conformation shown in the molecular structure diagram of Fig. 19.14, and the third
molecule has the opposite, i.e. S- and R-configurations. Hence, there is a deviation
from the usual 1:1 enantiomeric ratio, hence the use of the term “unbalanced”. In
one sense, 14 can be considered a multi-component crystal of an enantiomeric pair
of 14 co-crystallised with a RS-diastereoisomer.
Fig. 19.14 Images for 2-[(dimethylamino)methyl]-1λ 4 ,3λ 4 -dithiolane-1,3-dione (VEFMEZ); 14:
chemical diagram, molecular structure and overlay diagram