Synthetics
Bicyclononalactone (iff) has a sweet, powdery scent with notes of tonka bean, almond, vanilla, coumarin, hay, and coconut.
Mosciano, Gerard P&F 26, No. 3, 80, (2001): Sweet, creamy, lactonic, coconut, coumarin, with milky and creamy vanilla nuances
Luebke, William tgsc, (1987): Sweet herbal coumarin tonka woody
IFF: Very useful in preparing coumarin alternatives. more stable than coumarin. it also has a very good tonka characteristic. almond, vanila, coumarin, hay, coconut note
Moellhausen: Sweet aromatic, lactonic; coconut- and coumarin-like; sharp, fatty, fruity
Taytonn ASCC: Almond, coconut, coumarin, powder/ powdery, sweet, tonka, vanilla
Pell Wall Perfumes: Almond, vanila, coumarin, hay, coconut note
Also known as octahydrocoumarin, this iff product is described by them as: “very useful in preparing coumarin alternatives. more stable than coumarin. it also has a very good tonka characteristic. almond, vanila, coumarin, hay, coconut note”. also easier to handle because it’s liquid rather than the crystals of coumarin.
Takasago: Sweet harbaceous or coumarin-like
Gives body to fruity-floral compositions. may be used in combination with coumarin and also with powdery notes.