Adducts with sulfur dioxide and sulfur trioxide
These oxides have been included here because their adducts provide a large number of structural problems. In some cases molecular adducts may form, and in others atomic rearrangements may occur; the whole field is open to further investigation. Similar adducts can be obtained with other non-metal oxides, and BF3 adducts with nitrogen oxides can be mentioned as an example (1955: 8; 1957: 20; 1958: 31). The sulfur oxides, however, have been much more extensively studied.