My recommendation is to use wedge bonds when needed to clarify the structure. They must be used in a manner consistent with use in non-bridgehead situations.
The picture contains seven examples.
Can be argued contains all needed information, provided the perspective is interpreted as sloping towards the viewer.
Clarifies the perspective.
Is incorrect because the bonds to A and B are in the plane of the paper
see (3)
identifies the bonds that are not in the plane of the diagram and points to the stereogenic bridgehead but the hashed bond is redundant information
points to all stereogenic centers with bonds in the correct direction
Uses a crossing bond to specify orientation and requires (in my opinion
for this example) no other bond marks.
I do not recommend (3) and (4) because they identify the wrong bonds. The
others are OK and the minimum bond information should be used. I don't see
many uses of the crossed bond, so whilst it is a good approach, it may not be taken up readily and it does introduce another bond style.
Open for comments.
