Download e-book for kindle: Progress in Inorganic Chemistry, Vol. 15 by S.J. Lippard

By S.J. Lippard

ISBN-10: 0471540854

ISBN-13: 9780471540854

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Moreover, t h e p r o d u c t i s f r e e from BF3, which i s e s p e c i a l l y i m p o r t a n t i f t h e B2H6 i s r e q u i r e d f o r s e l e c t i v e reductions ( 2 4 ) . A 98% y i e l d may a l s o be o b t a i n e d w i t h i o d i n e (110): I n t h e l a t t e r c a s e i n t e r a c t i o n w i t h t h e s o l v e n t must be prevented by keeping t h e c o n c e n t r a t i o n o f I 2 l o w and removing t h e d i b o r a n e from t h e s o l u t i o n as soon as i t i s formed. a t e d system.

304, 282) I n such c a s e s it i s u s u a l l y n e c e s s a r y t o remove t h e diborane p r o g r e s s i v e l y as it i s formed. These r e a c - t i o n s a r e g e n e r a l l y of l i t t l e p r a c t i c a l u s e , s i n c e t h e s t a r t i n g material frequently requires diborane f o r i t s preparation. Dimethoxyborane i s an e x c e p t i o n , how- e v e r , and one production method makes use of i t s 38 L. H . Long d i s p r o p o r t i o n a t i o n (154) a t t h e t o p of a r e f l u x c o l - umn.

W i t h LiBH4 o r B (OMe) 3 ( 8 7 ) I . The a c t i o n of t h e last-named compound i s probably f i r s t t o form L i B H (OMe) 3. Because L i B C 1 4 h a s no s t a b l e e x i s t e n c e , t h e react i o n between L i H and B C l 3 would be expected t o be analogous t o t h e f o r e g o i n g two-stage p r o c e s s . i s borne o u t by experiment ( 8 7 ) . This The r e a c t i o n i s exothermic, w i t h d i b o r a n e y i e l d s of 70 t o 77%. A much p u r e r product i s o b t a i n e d i f B C l 3 r a t h e r t h a n i t s e t h e r a t e i s used (881, presumably because e t h e r cleavage i s t h e r e b y minimized.

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Progress in Inorganic Chemistry, Vol. 15 by S.J. Lippard


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