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The mass spectra of several pyrazaboles of type 1 (R = H) have been studied. The data illustrate that electron impact causes three major fragmentation patterns for the species. Symmetrical cleavage of the pyrazabole followed by further breakdown is common to all compounds. In addition, those pyrazaboles containing H or CH3 at the C atoms of the pyrazole rings undergo an electron impact-induced rearrangement which appears to result in the formation of a species containing a B2N3 ring as a structural entity; subsequent breakdown leads to a B2N2 ring system. The mass spectra of halo-or pseudohalo-substituted pyrazaboles evidence the ready loss of hydrogen halide as a predominant feature; no rearrangement ions are observed.

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Numerous aldehydes and ketones have been combined successfully with sodium acetylide under varying conditions to form acetylenic carbinols. Of the aromatic aldehydes reported2•3 benzaldehyde was the only aromatic aldehyde that gave a good yield of its corresponding acetylenic carbinol.