1. Isotoluenes are a prominent class of compounds with exocyclic double bonds. 2. The product contains a new exocyclic double bond. 3. This served solely as a protecting group in preparation for modifications of the exocyclic alkene. 4. These include pseudoacyl halides, pseudoesters, endocyclic and exocyclic -N pseudoamides, and pseudoanhydrides. 5. Both double bonds in the central B ring are exocyclic with respect to rings A and C. 6. The "'isotoluenes "'in organic chemistry are the non-exocyclic double bond. 7. Intermediate "'2 "'undergo an acetylation and elimination step to form the exocyclic olefin. 8. The exocyclic 1, 2-diol of galactofuranose is the epitope recognized by the putative chordate immune lectin intelectin. 9. Chlorins are distinguished from the parent porphyrins by a reduced exocyclic double bond, decreasing the symmetry of the conjugated macrocycle. 10. It is an example of a cross-conjugated alkene, being composed of cyclopropene with an exocyclic double bond attached.
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