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Preparation and Some Reactions of (Acylamino)diorganoboranes

✍ Scribed by Yalpani, Mohamed ;Köster, Roland ;Boese, Roland

Publisher
Wiley (John Wiley & Sons)
Year
1993
Tongue
English
Weight
577 KB
Volume
126
Category
Article
ISSN
0009-2940

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✦ Synopsis

Abstract

The carboxamides RCONH~2~ [RPh (1), __t__Bu (2)] react with BEt~3~ and with (9H‐9‐BBN)~2~ to give the (acylamino)diethylboranes 3, 4 and the 9‐acylamino‐9‐BBN 5, 6, respectively. Compounds 3 and 4 are largely monomeric (NMR) in solution and dimeric as crystalline solids [X‐ray structure of (4)~2~]. The 9‐BBN derivatives 5 and 6 are associated and probably polymeric in solution (NMR). The 1:1 adducts 7 and 8 containing the ring (X‐ray structure of 7) are formed on the reaction of 3 and 4 with (9H‐9‐BBN)~2~ by borane exchange. The former is also obtained directly by treating compound 1 or 2 with (9H‐9‐BBN)~2~. Compound 7 reacts at 140–150°C to give the air‐stable heterocycle 11 (X‐ray structure).

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