Abstract The origin of the hydrogen atoms implicated in the single and double hydrogen rearrangements (leading to [C6H9O]+ and [C6H8O]+ ions, whose relative abondance is typical of the phosphorus configuration) was investigated by means of selective deuteriation of the β and γ carbon (relative to phosphorus) of the isomeric 2, 4, 7-trioxa-3-methyl-3- phospha-3-thionobicyclo (4, 4, 0) decanes 1a and 1b. For both isomers the β hydrogen ...
