21. Unsuitable alkenes are tetrasubstituted alkenes and alkenes with strongly electron withdrawing groups. 22. Unsuitable alkenes are tetrasubstituted alkenes and alkenes with strongly electron withdrawing groups. 23. Unsuitable alkenes are tetrasubstituted alkenes and alkenes with strongly electron withdrawing groups. 24. Initiation occurs through substitution of the catalyst s alkene ligand with substrate. 25. This structure decomposes to form an alkene by an Danishefsky Taxol synthesis. 26. Although stable, these alkenes are very reactive compared to ordinary alkenes. 27. Although stable, these alkenes are very reactive compared to ordinary alkenes . 28. This intermediate is unstable and releases sulfur dioxide to form the alkene . 29. This diene reacts rapidly with electrophilic alkenes , such as maleic anhydride. 30. The hydroboration reaction is a useful reaction to functionalize alkenes to alcohols.
