Table 1 Selection of reported radiochemical yields of [18F]FEtOTs obtained by using a wide range of temperatures, reaction times, amounts of K2CO3 and OTs(CH2)2OTs, and base/precursor molar ratios
Entry | Temperature (°C) | Time (min) | K2CO3 (mg) | OTs(CH2)2OTs (mg) | Base/precursor (Molar ratio) | Yield (%) | References |
|---|---|---|---|---|---|---|---|
1 | 70 | 15 | 1.7 | 8 | 0.6 | 62**** | Erlandsson et al. 2009) |
2 | 75 | 5 | 2 | 7.5 | 0.7 | 45*** | Schoultz et al. 2013) |
3 | 80 | 3 | 2 | 10 | 0.5 | NR | Schirrmacher et al. 2002) |
4 | 80 | 5 | 1.8 | 2 | 2.4 | 75* | Funke et al. 2012) |
5 | 82 | 10 | 2.76 | 8.9 | 1 | 82*** | Block et al. 1987) |
6 | 85 | 3 | 2 | 4 | 1.3 | 70*** | Bauman et al. 2011) |
7 | 88 | 3 | 2 | NR | - | 60*** | Riss et al. 2009) |
8 | 90 | 3 | 2 | 4.5 | 1.2 | 84* | Tietze et al. 2006) |
9 | 90 | 8 | 1 | 5 | 0.5 | 75–88** | Prenant et al. 2008) |
10 | 90 | 10 | 0.7 | 5 | 0.4 | 65*** | Wester et al. 1999) |
11 | 95 | 5 | 2 | 8 | 0.7 | 35*** | Sun et al. 2012) |
12 | 95 | 10 | 2 | 5 | 1 | 75*** | Majo et al. 2013) |
13 | 100 | 10 | 5 | 5 | 2.7 | 90*** | Li et al. 2012) |
14 | 110 | 10 | 2 | 8 | 0.7 | 90** | Zheng et al. 2008) |
15 | 125 | 5 | 0.7 | 5 | 0.4 | NR | Elsinga et al. 2002) |
16 | 130 | 4 | 2 | 5 | 1 | NR | Shalgunov et al. 2015) |