Die durch Umsetzung der sekundären Amine (I) mit Kohlendioxid (II) erhältlichen Alkylammoniumcarbamate (III) reagieren mit Trimethylchlorsilan (IV) zu trimethylsilylierten N‐AlkyI‐substituierten Carbamaten (V).
H-1525 " B u d a p e s t , POB 7 1 , riungary . S U I~I~A R Y N,N-dialkyl-carbarnic a c i d -t r i m e t h y l s i l y l -e s t e r s were s y n t h e s i z e d s t a r t i n g w i t h 14C02. The new s y n t h e s i s route is s i m p l e and p r o v i d e s good r a d i o c h e m i c a l y i e l d . S i l y l -c a r b a r n in a t e s d i r e c t l y o r t h o r o u g h c a r b a r n o y l -h a l o g e n i d e s may be u s e d f o r p r e p a r a t i o n o f l a b e l l e d h e r b i c i d e s : c a r b a m a t e s , t h i o c a rb a m a t e s and u r e a s . c i i u r o n -1 4~. I N T R O D U C T I O N Carbamate, t h i o c a r b a m a t e and u r e a h e r b i c i d e s a r e w i d e l y + E o t v o s Lorand U n i v e r s i t y , Department o f G e n e r a l and I n o rg a n i c Chemistry: H -1 0 8 8 Budapest ivluzeurn k r t 6-8, Hungary.
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