Bond migration, i.e. the formal transfer of one end of a skeletal bond to another position, with a compensating transfer of a hydrogen atom, can be indicated by a prefix of the form 'x ( y → z )abeo-
'. The prefix is compiled as follows: a numeral denoting the stationary (unchanged) end of the migrating bond (x
) is followed by parentheses enclosing the locant denoting the original position (y
) from which the other end of this bond has migrated, an arrow, and the locant (z
) denoting the new position to which the bond has moved. The closing parenthesis is followed by the italicized prefix abeo
- (Latin: I go away) to indicate bond migration. The original numbering is retained for the new compound and is used for the numbers x
. It is always necessary to specify the resulting stereochemistry.
Blue Book Guide, p. 31 (https://doi.org/10.1351/pac199971071327)