Table 3. Important Bond Lengths and Angles of the [K@cryptand]+ Salts of Ketenyl Anions 4.
| 4a-N | 4a-O | 4b-O | 4a-Sa | 4b-Sa | 4a-Sea | |
|---|---|---|---|---|---|---|
| P–E [Å] | 1.597(2) | 1.496(2) | 1.498(2) | 1.991(1) | 2.043(3) | 2.145(5) |
| 2.023(5) | ||||||
| P–C [Å] | 1.689(2) | 1.686(2) | 1.694(2) | 1.670(7) | 1.662(15) | 1.699(12) |
| 1.613(15) | ||||||
| C–C [Å] | 1.250(3) | 1.240(2) | 1.219(3) | 1.244(5) | 1.263(12) | 1.220(11) |
| 1.245(13) | ||||||
| C–O [Å] | 1.201(3) | 1.212(2) | 1.202(2) | 1.207(4) | 1.215(8) | 1.201(4) |
| 1.207(11) | ||||||
| P–C–C [°] | 143.6(2) | 148.9(2) | 160.1(2) | 151.6(8) | 142.6(17) | 159.6(12) |
| 149.2(18) | ||||||
| C–C–O [°] | 174.8(2) | 175.1(2) | 176.0(2) | 176.2(6) | 173.2(12) | 175.8(9) |
| 173.9(19) |
a
The crystal structures of 4b-S, 4a-S, and 4a-Se contain a disorder of the ketenyl and phosphinoyl moiety (see the SI for further details). For 4b-S, both parts of the disorder showed equal occupation. Therefore, the values of both components are discussed. For 4a-S and 4a-Se, the minor component showed an occupation of only 17 and 15%, respectively. Hence, only the main structures are discussed.