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| Structural parameters | 2a18a | 2b | 2c | 2d |
|---|---|---|---|---|
| d(C O)/Å | 1.2024(19) | 1.2074(18) | 1.207(3) | 1.2070(17) |
| d(C–O)/Å | 1.2972(19) | 1.2980(17) | 1.298(3) | 1.2977(17) |
| d(O–B)/Å | 1.535(2) | 1.5363(18) | 1.540(3) | 1.5492(18) |
| d(Ccarbenic–CO2)/Å | 1.516(2) | 1.5071(19) | 1.523(3) | 1.5247(19) |
| α(CO2)/° | 130.09(15) | 128.78(13) | 129.96(19) | 129.31(13) |
| D(NHC–CO2)/° | 80.5(2) | 7.3(2) | 76.7(3) | 79.2(2) |
