Research Article
[4+2] versus [2+2] Homodimerization in P(V) Derivatives of 2,4-Disubstituted Phospholes
Table 1
31P NMR chemical shifts (ppm) (CDCl3) of 1, 2, and 3.
| Entry | R | 1 | 2 | 3 |
| 1 | Ph (a) | 11.3 | 47.8 | 55.8 (d, = 37.6 Hz) 76.3 (d, = 37.6 Hz) | 2 | Trimethylsilyl (b) | 31.9 | 59.0 | 64.4 (d, = 37.0 Hz) 83.2 (d, = 37.0 Hz) | 3 | t-Butyl (c) | 1.4 | 47.5 | No dimer |
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