Table 2. Unique rings of 1a mok network.
| No. | Cyclobutane | Overall type† | Donor type | Acceptor type |
|---|---|---|---|---|
| Six-membered rings | ||||
| Primary | ||||
| 1 | CB2 | DD | syn, anti | – |
| 2 | CB1 | DA | anti | 3-acceptor |
| 3 | CB2 | DA | syn | 3-acceptor |
| 4 | CB1 | DA | anti | 4-acceptor |
| 5 | CB2 | DA | anti | 4-acceptor |
| 6 | CB1 | AA | – | 3,4-acceptor |
| Secondary | ||||
| 7 | CB1 | DD | anti/gauche | – |
| 8 | CB2 | DA | anti | 4-acceptor |
| 9 | CB1 | DA | gauche | 4-acceptor |
| 10 | CB2 | DA | anti | 3-acceptor |
| 11 | CB1 | DA | anti | 3-acceptor |
| 12 | CB2 | AA | – | 3,4-acceptor |
| Eight-membered rings | ||||
| 1,5 | CB1 | DD | anti, gauche | – |
| 2,6 | CB2 | DA | syn | 4-acceptor |
| 3,7 | CB1 | DA | gauche | 3-acceptor |
| 4,8 | CB2 | AA | – | 3,4-acceptor |
†
Cyclobutane participation in six- and eight-membered rings as AA = double hydrogen-bond acceptors, DD = double hydrogen-bond donors, or DA = hydrogen-bond donor and acceptor.