Table 1. Isomerization Ratios for anti-/syn-1 and anti-/syn-2.
anti/syn ratio |
|||||
---|---|---|---|---|---|
temperature | time (h) | 1a | 1b | 2a | 2b |
RT | 0 | 2.5/1 | 2.5/1 | 5/1 | 1.25/1 |
12 | 2.5/1 | 4.2/1 | |||
16 | 1.25/1 | ||||
24 | 2.5/1 | 4.2/1 | |||
48 | 2.5/1 | 2/1 | 3.3/1 | 1.25/1 | |
60 °C | 0 | 2.5/1 | 2.5/1 | 5/1 | 1.25/1 |
8 | 1.7/1 | 1/1 | |||
12 | 1/5 | ||||
24 | 1.1/1 | 1/10 | |||
48 | 1/1.25 | 1/3.3 | 0/1 | 1/20 | |
120 | 1/10 | ||||
240 | 0/1 |