An iniproved method for the preparation of N-trimethylborazole is described. Lithium borohydride and the appropriate monoalkylammonium halide react in diethyl ether, the ether is removed, and the residue so obtained is pyrolyzed to give the desired product.Physical The method is extended to iK-triethyl-, S-tri-n-propyl-and N-tri-isopropylborazoles. properties of the new borazoles are given.The preparation of trimethylamine-borine, Ndimethylaminoborine, and N-trimethylborazole accomplished by Schaeffer and Anderson3 by the reaction of lithium borohydride with the appropriate methylammonium chloride, and the subsequent preparation of borazole4 by the reaction of ammonium chloride with lithium borohydride presents a unique and general method for the establishment of a boron-nitrogen bond. The reaction of methylammonium chloride with lithium borohydride has been further investigated and the preparation of N-trimethylborazole has been improved and simplified. In addition, the reactions of several higher monoalkylammonium chlorides with lithium borohydride leading to the preparation of N-triethyl-, N-tri-n-propyl-and N-tri-isopropylborazole were investigated.The reactions are most conveniently carried out in two steps, represented by the equations LiBH4 + RNHaCl = LiCl + BNHjR + Hz
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