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Extra resources for Analytical Profiles of Drug Substances, Vol. 13
A . HASSAN 30 1 . 2 3 CAS R e g i s t r y Number a ) Natural camphor [76-22-2] b ) S y n t h e t i c camphor [ 76-22-21 (2) 1 . 25 S t e r e o c h e m i s t r y The s t e r e o c h e m i s t r y of camphor i s w e l l summarised by F i n a r and Pinder ( 5 , 8 , 9 ) . Camphor has two d i s s i m i l a r c h i r a l c e n t r e s ( C - 1 and C-4) and t h e r e f o r e f o u r enantiomorphs might be expected. But only one p a i r of enantiomers i s known. This i s due t o t h e f a c t t h a t o n l y t h e cisform i s p o s s i b l e ; trans f u s i o n of t h e gem-dimethylmethylene b r i d g e t o cyclohexane r i n g i s impossible.
Fulse light selection 9V, En out. C. 0, 5000 CPS. (5) q . 3 . 1. All solubilities were determined at room temperature and are presented in Table-8. (5) solub4. Table 8. 6. 3. 16 M). 4. Dipole Moment The dipole moment of atenolo& was determined in propionic acid solutions, at 20 C, using a Dipolmeter DM 01 (Wiss. -Techn. 20 D. (5) . VESNA CAPLAR ET AL. 5. Optical Rotation The atenolol molecule contains an asymmetric carbon atom. The commercial product, however, is a racemic mixture and its resolution has not been reported so f a r .
A . y. O E t 2 + I02Et CO2Et E t ONa 0 C02Et 53 CAMPHOR [ 51 61 JABER S. MOSSA AND MAHMOUD M . A.