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The mass spectral fragmentation of substituted tetrahydro-1,3,2-oxmphzapbosphorin-2-oxides occurs by the cleavage of ring bonds. The ions due to simple cleavage, single and double hydrogen migration, seem to be triggered by C-0 bond cleavage of the oxazaphosphorin ring. The variations in the relative abundance of ions arismg due to similar fragmentation modes have been found to depend on the nature of the substituent and the stability of the particular fragment. Tbe single hydrogen transfer process is supported by metastable ion and shift techniques.

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