Analogs of sparteine. IV. Mass spectral features of a series of N, N′‐disubstituted bispidines

The mass spectra of a series of N, N ′‐disubstituted bispidinc derivatives have been investigated, and salient features analogous to those seen in the spectra of related azabieyelie compounds observed. The most important feature observed in the spectra is the common base peak (m/e 58), which results from the generation of N, N ‐dimethylformimmonium ion 24. The pathway by which this ion originates is discussed.