| Number | Name | Date | Kind |
|---|---|---|---|
| 2973372 | Thompson | Feb 1961 | |
| 3022352 | Milas | Feb 1962 | |
| 3236872 | Manly | Feb 1966 | |
| 3399219 | Braunwarth | Aug 1968 | |
| 3939138 | Suzuki et al. | Feb 1976 | |
| 4158021 | Roskott | Jun 1979 |
| Number | Date | Country |
|---|---|---|
| 889652 | Feb 1962 | GBX |
| Entry |
|---|
| Silbert "J. Amer. Chem. Soc." Oct. 1962, vol. 39, No. 11, pp. 480-487. |
| Coleman, Journal of The American Chemical Society, pp. 4886-4889, vol. 74, No. 19 (1952). |
| King, Journal of The Chemical Society, pp. 587-593, (1956). |