CHARACTERISTIC IONS IN MASS-SPECTRA OF DIDEUTEROALKANES

A study has been made of electron impact mass spectra of 1,2-, 2,3- an d 3,4-D2-heptanes, 1,4- and 1,5-D2-octanes, 1,2-D2-decane, 1,2-D2-2-me thyl- and 1,5-D2-3-methylpentane, 3-deutero-methyl-3-deuteroheptane, 3 -deuteromethyl-4-deuteroheptane, 4,5-D2-2,2,4-trimethylpentane, 4-deut eromethyl-1-deutero-octane and 2-deuteromethyl-1-deuterodecane, record ed during the catalytic deuteration of alkenes or the deuterogenolysis of cyclopropanes and thiacyclanes under conditions of reaction chroma to-mass spectrometry. It has been found that, to determine the positio n of the deuterium marker in the dideutero-n-alkane series, it is conv enient to use M-methyl]+, [M-ethyl]+ and [M-propyl]+ ions formed by th e rupture of bonds at the ends of the chain. In the case of branched d ideuteroalkanes, information on the position of deuterium is borne by the ions formed by rupture of bonds at the points of branching. These data make it possible to solve structural questions among the original compounds.