Synthesis and Structure Elucidation of a New Potent Sandalwood‐Oil Substitute

New derivatives of campholenaldehyde (= 2‐(2,2,3‐trimethylcyclopent‐3‐enyl)ethanal bearing two cyclopropane moieties were synthesized, and the structure of the stereoisomer responsible for its exceptionally strong, diffusive, and natural sandalwood‐oil scent, ((1 S ,2 S )‐1‐methyl‐2‐{[1 S ,3 R ,5 R )‐1,2,2‐trimethylbicyclo[3.1.0]hex‐3‐yl]methyl}cyclopropyl)methanol ( 13a ), was elucidated.