Negative ion mass spectrometry and stereochemistry of organic compounds. 7. Phenoxybenzyl esters of 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-carboxylic acid

The stereospecific fragmentation of 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid α-cyano-3-phenoxybenzyl ester was found under conditions of resonant capture of electrons of epithermal energies with dissociation of HCN. The stereospecific collection of fragment ions allows not only the identification of one of the diastereoisomers, but also the quantitative (≥5%) determination of it in a mixture of racemates.