One-group transforms

Two group transforms are keyed specifically by two functional groups with a path of predetermined length between them. Examples of these are shown below. 

One group transforms are similar but are keyed by one specific group with an associated path (not as 

ACS Symposium Series Ameriean Chemieal Soeiety Washington, DC, 1977. 

A more complicated case would exist if the second group necessary to key the transform was totally absent. In the example below, the only functional substructure capable of keying a transform would be the olefin. To perform the Aldol 

---