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T h e s y n t h e s i s a n d X -r a y c r y s t a l s t r u c t u r e a n a l y s i s o f t w o t r i o r g a n os t a n n y l c o h a l t c o m p l e x e s ( I ) a n d ( 1 1 ) c o n t a i n i n g a n a s y m m e t r i c t i n a n d a n a s y m m e t r i c c a r b o n a t o m , CH, CO I .. J

The configurational stability of triorganostannyl-iron, -manganese and -cobalt complexes has been determined by studying the coalescence of the NMR signals of diastereotopic groups and by looking at the epirnerization of diastereomeric mixtures of these compounds. Possible substitution reactions, transforming the studied derivatives into one another, have been checked.

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