How can we know two rings are cis fused or trans fused
To determine if two rings are cis fused or trans fused, you need to examine their relative orientation or arrangement with respect to each other. The key factor is the positioning of substituent groups on each ring.
Here's how you can identify whether the rings are cis fused or trans fused:
1. Identify the two rings: Locate the two rings that are connected to each other.
2. Analyze the substituent groups: Look at the substituent groups attached to the rings (if any). It's important to consider the substituents that are found on the same side or opposite sides of the rings.
3. Assess the relative orientation: Compare the substituents on the rings to determine their relative orientations.
- For cis fused rings: If the substituents on the rings are on the same side, i.e., they are cis to each other, then the rings are said to be cis fused.
- For trans fused rings: If the substituents on the rings are on opposite sides, i.e., they are trans to each other, then the rings are said to be trans fused.
An illustration might help clarify the concept:
Substituent Groups Substituent Groups
on Ring A on Ring B
cis fused cis fused
A B A B
Substituent Groups Substituent Groups
on Ring A on Ring B
trans fused trans fused
A B A B
By comparing the placement of substituents on each ring, you can determine whether the two rings are cis fused or trans fused.