Table 3. Catalyst-controlled ethenolysis for the enrichment of olefin geometry in macrocyclic peptides.

Entry	Compound	Initial E : Z a	Final E : Z a	Yield b
1	9a	96 : 4	99 : 1	62
2	9b	80 : 20	97 : 3	74
3	9c	82 : 18	96 : 4	80
4	15	90 : 10	>99 : 1	77
5	16	81 : 19	98 : 2	64
6	17	90 : 10	99 : 1	67
7	18	77 : 23	88 : 12	45

^aDetermined by ¹H, ¹³C NMR spectroscopy and analytical HPLC/MS.

^bIsolated yield.