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Synthesis, Structure and Reactivity of 3,4-Dihydro-2H-1,2,4,3-triazaboroles

✍ Scribed by Lothar Weber; Markus Schnieder; Hans-Georg Stammler; Beate Neumann; Wolfgang W. Schoeller

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 507 KB
Volume: 1999
Category: Article
ISSN: 1434-1948
DOI: 10.1002/(sici)1099-0682(199907)1999:7<1193::aid-ejic1193>3.0.co;2-j

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✦ Synopsis

4-diphenyl-2H-1,2,4,3-triazaboroles 3a, 3b,
and
3
-cyano derivatives 6 and 7 resulted from the reaction of 4 with AgOCN and AgCN, respectively. Compound 7 was and 4 were synthesized by cyclocondensation of N 1 ,N 3 -diphenylformamidrazone (1) with dibromophenylborane, di-transformed into the bis(1,2,4,3-triazaborolyl)oxane 8 by silver oxide. Compounds 1-8 were characterized by bromomethylborane, and boron trichloride. 3-Chloro-3,4dihydro-2,4-diphenyl-2H-1,2,4,3-triazaborole (4) was con-elemental analyses and spectroscopic methods ( 1 H, 11 B, and 13 C NMR; IR; MS). The molecular structure of 8 was verted into 3,4-dihydro-2,4-diphenyl-2H-1,2,4,3-triazaborole (5) by treatment with LiAlH 4 . The corresponding 3-cyanato established by single-crystal X-ray diffraction analysis.

For the preparation of 3-halo-1,2,4,3-triazaboroles and Universitätsstraße 25, D-33615 Bielefeld, Germany

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