I am confused on whether decalin system can have double bond at bridgehead carbons or not.
Dear Geetika Arora, decalin has no double bond and no bridge. How are you going to apply such a rule. My Regards
https://www.masterorganicchemistry.com/2014/09/02/bredts-rule-and-summary-of-cycloalkanes/
Decalin as such has no possibility of that. Decalin based natural products lack the ring junction double bond. Check the diterpenics, sesqui, and triterpene skeleton and examples, so is the case in steroid based products!
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