Mass-spectrometric study of compounds from the cyclopropane series 8. The behavior of the functional derivatives of the spirooctadienones under chemical ionization

Conclusions

• 1. The interaction of the spirooctadienones with CH₄ plasmas gives rise to (M + C₃H₅)⁺, (M + C₂H₅)⁺, (M + H)⁺, (M + H − H₂)⁺, (M + H − CH₄)⁺, (M + H − C₄H₈)⁺, (M + H − 2C₄H₈)⁺, and (M + C₂H₅ − C₄H₈)⁺ ions; in turn, the appearance of these ions in the mass spectra gives information of the molecular weights of these compounds and the presence of the t-C₄H₉ groups in their molecules.

• 2. The presence of the cyclopropane ring in the molecule determines the breakdown of the protonated ions of spirooctadienones with functional groups in the CPR, (M + H − CHX)⁺ and (M + H − CH₂CHX)⁺ ions being formed.