Table 1. Attempts at Catalytic DHBTA of 4-Ethynyltoluene Using (PNP)Ru and Os Complexes.
entry | [cat.] | % conv. | % productsa |
---|---|---|---|
1 | 3-Ru | 99 | 0/95/5 |
2 | 4-Ru | 88 | 0/55/45 |
3 | 3-Os | 25 | 0/72/28 |
4 | 4-Os | 25 | 0/72/28 |
5 | 5-Os | 35 | 0/51/49 |
Product yields listed as 7/(E)-8/(Z)-8.