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On the nitration and bromination of 4-methyl-4,5-borazarothieno[2,3-c]pyridine

✍ Scribed by Salo Gronowitz; Johannes Namtvedt

Publisher: Elsevier Science
Year: 1966
Tongue: French
Weight: 150 KB
Volume: 7
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)99897-1

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✦ Synopsis

A recent publication by Dewar and Rxenberg (1) on the bromination and nitration of 4-mct~l-4,~-borazal~o~i~lins (I) has prowted us to report our results on the brcmilution am3 nitration of the thdophene analogue of I, 4-methy1-4,5-borazarothieno(2,3-c]pyridine (IIa; R-C%, R'=Ii). This is only a emall part of our work on the synthesis and mactions of new heteroaromtlc boron compounds of type II and III, the result of which will be published elsewhere. IIa was obtained In 82 $ yield by refluxing 4-hydroxy-4.5~borazarot.hieno[2,3-cIpyridhe (2) (Ilb; R-OH, R'-H) with butyl alcohol using a Dean-Stark trap, removing exe** butyl alcohol in vacua ark3 reacting the remaining bug1 ester dissolved in ether with an exe&e of methyl magm-

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