Preliminary Study on Mass Spectra of Derivatives of Dithiophosphonic Acid

Four derivatives (R_1O)(R_2S)P=O(SH) of dithiophonic acid were determinated and interpretated. They are (Ⅰ) R_1=R_2=n-C_3H_7; (Ⅱ): R_1=-CH_3, R_2=-CH(CH_3)_2; (Ⅲ): R_1=-CH_3, R_2=-C_2H_5; (Ⅳ): R_1=n-C_3H_7, R_2=-CH_3.A variety of α cleavages to P=O double bond have been studied. The quantity Z(Z=R_1O~+ abundance/M~- abundance) of fragments R_1O~+ for different R_1 produced by α cleavages is compared with each other. The results indicate that the quantity Z of R_1O~+ is decreased by the isomerization of R_1 and increased by the nonbranching of R_1; In the case of R_2S~+ , the quantity Z (Z=R_2S~+ abundance/M~+ abundance) of R_2S~- is increased by smallar R_2 and decreased by bigger R_2.