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condensation reactions of boranes with biurets. They include species containing a N H or B H unit as potentially reactive sites. The latter are extremely sensitive to hydrolysis but are readily handled as the 2-methylaminoethanol derivative containing four- coordinate boron. Introduction The sparce literature on isoelectronic boron-nitro- gen analogs of substituted uracils of type 1 (= 1,3,5- triaza-2-boracyclohexa-4,6-diones) has been sum- marized in previous work, in which detailed syn- theses of a few representative species as well as some of their properties were

Varian Model EM-390 spectrometer, nB (reference: (C2H5)2OBF3) and 13C spectra (reference: TMS) were obtained on a Varian Model FT-80A instrument. Chemical shift data are given in ppm with positive values indicating downfield from the reference (unless otherwise noted: external) signal; abbreviations: s = singlet; d = doublet, t = triplet; as asterisk denotes a broad signal. 2-Phenyl-1,2-azaborauracil (2-phenyl-1,3,5-triaza- 2-boracyclohexa-4,6-dione) (If) A mixture of 5.15 g (50 mmol) of carefully dried biuret, 9.69 g (55 mmol) of bis

-oxa- cyclohexan-6-one (2 ) was treated with N,N '-di- methylurea in refluxing toluene. However, when 2 w as rea c ted w ith e x ce ss m o lten N .N '-d im eth v lu re a at 190—200 °C, two m ajor types of boron-containing products were obtained. Approximately one half of 1422 L. Komorowski — K. Niedenzu • New Boron-Nitrogen Analogues of Uracil Derivatives the boron content of the originating 2 was found as the Lewis acid 1,3,5-trimethyl-2-hydroxy-1,3,5-triaza- 2-boracyclohexa-4,6-dione (la ); and a mixture of the salts 5a and 5b was the other major boron

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Chemistry of Phosphorus. 156. 1,2-Di-rm-butyl-cyclotriphosphane, (r-BuP)2 PH, and 1,2.3-Tri-rm-butyl-cyclotetra- 1607 phosphane. (r-BuP)3P H ................................................. 1,3,5-Triaza-2-boracyclohexa-4,6-diones Preparation and Characterization of Some Isoelectronic Boron-Nitrogen Analogs of Substi- 740 tuted U r a c il ....................................................................... 1199 1068 108 477 1511 900 1173 1362 1644 368 1068 373 1274 389 1800 Subject Index Tribromotellurium Trithiocarbonate Preparation of Haloselenium and