Table 1. Ring-closing metathesis of peptides bearing i, i + 2 olefin crosslinks.

Catalyst	Yield a (%)			Selectivity b (E : Z)
	9a	9b	9c	9a	9b	9c
	m = 1, n = 1	m = 2, n = 1	m = 2, n = 2	m = 1, n = 1	m = 2, n = 1	m = 2, n = 2
1	58	54	68	81 : 19	72 : 28	66 : 34
2	71	61	77	91 : 9	88 : 12	82 : 18
3	63	55	70	90 : 10	85 : 15	83 : 17
4	66	60	66	82 : 18	85 : 15	78 : 22
5	45	24	44	81 : 19	n.d.	81 : 19
6	47	21	26	13 : 87	n.d.	15 : 85
7	41	17	24	7 : 93	n.d.	5 : 95

^aIsolated yields.

^bDetermined by ¹H and ¹³C NMR spectroscopy.