Chapter 3.2, Problem 3P

Classify a carbon atom by the number of carbons to which it is bonded can also be

done in more complex molecules that contain heteroatoms. Classify each $s{p}^3$ hybridized carbon atom in bilobalide, a compound isolated from Ginko biloba extracts, as $1^{°}$ $2^{°}$ $3^{°}$ or $4^{°}$.