Skeletal transformations of heterocage compounds involving the hetero-function

Published data on the skeletal transformations of oxa-, aza-, bora- and polythia-cage compounds accompanied by replacement of one heteroatom by another, of a heteroatom by a carbon atom or of a carbon atom by a heteroatom are surveyed. Skeletal transformations of compounds with oxacage structures leading to compounds with carbocage structures are considered. The bibliography includes 65 references.