Comparative Study of Enthalpies of Hydrogen Bond Formation of Enamino and Amino Ketones

✍ Scribed by H. van Brabant-Govaerts; P. Huyskens

• Publisher: Wiley (John Wiley & Sons)
• Year: 2010
• Weight: 360 KB
• Volume: 90
• Category: Article
• ISSN: 0037-9646
• DOI: 10.1002/bscb.19810901013

✦ Synopsis

The c o m p l e x a t i o n e n t h a l p i e s -A H a b and t h e s t a b i l i t y c o n s t a n t s K a b o f c o m p l e x e s b e t w e e n 3 -d i m e t h y l a m i n o -l -p h e n y l -2 -~r o p e n e -l -o n e and some n i n e p 8 en o l s o f i n c r e a s i n g a c i d i c s t r e n g t h s were d e t e r m i n e d i n benzene a t 298.16 K and compared w i t h t h e v a l u e s c h a r a c t e r i s t i c o f t h e c o r r e s p o n d i n g b a s e w i t h o u t d o u b l e C=C bond ( 6 -d i m e t h y l a m i n o p r o p i o p h e n o n e ) . The c o m p l e x a t i o n e n t h a l p y -AHab w i t h a g i v e n p h e n o l i s s y s t e m a t i c a l l y l o w e r f o r t h e u n s a t u r a t e d b a s e , t h e d i f f e r e n c e s b e i n g o f t h e o r d e r o f 6 t o 10 k J m o l e -* . e n t h a l p y o f t h e s a t u r a t e d b a s e w i t h a g i v e n p h e n o l i s o f t h e o r d e r o f m a g n it u d e o f t h a t f o u n d f o r t h e i m i d a z o l e s and f o r t h e t e r t i a r y a l k y l a m i n e s .