| 1 | 291-00-9 | 4H-1,3,5-Dioxazine | | | | |
| 2 | 291-08-7 | 1,4-Diaza-2,6-disilacyclohexane (8CI,9CI) | C2H10N2Si2 | 118.29 | | |
| 3 | 291-09-8 | 1-Oxa-4-aza-2,6-disilacyclohexane(8CI,9CI) | C2H9NOSi2 | 119.26996 | | |
| 4 | 291-13-4 | 1,3,5-Dioxathiane | | | | |
| 5 | 291-18-9 | 1,3,5-Oxadithiane | | | | |
| 6 | 291-21-4 | s-Trithiane | C3H6S3 | 138.27 | 215-220°C (dec.)(lit.) | |
| 7 | 291-22-5 | 1,2,4,5-Tetrathiane | C2H4S4 | 156.31 | 130-133 °C (sublm)(Solv: ligroine (8032-32-4)) | |
| 8 | 291-25-8 | 1,3,5-Triselenane | C3H6Se3 | 278.96 | | |
| 9 | 291-27-0 | 1,3,5-Trisilacyclohexane | C3H12Si3 | 132.38 | -10°C | |
| 10 | 291-32-7 | 1,3,5,2,4,6-Trioxatrigermin | Ge3H6O3 | 271.97 | | |
| 11 | 291-35-0 | 1,2,4,5-Tetraaza-3,6-disilacyclohexane | H8N4Si2 | 120.26 | | |
| 12 | 291-37-2 | cyclotriphosphazene ester | N3P3 | 134.94 | | |
| 13 | 291-43-0 | Cyclotrisilazane | H9N3Si3 | 135.35 | | |
| 14 | 291-44-1 | 1-Oxa-3,5-diaza-2,4,6-trisilacyclohexane (8CI,9CI) | H8N2OSi3 | 136.33 | | |
| 15 | 291-45-2 | 1,3-Dioxa-5-aza-2,4,6-trisilacyclohexane (8CI,9CI) | H7NO2Si3 | 137.32 | | |
| 16 | 291-46-3 | 1,4-Diaza-2,3,5,6-tetrasilacyclohexane (8CI,9CI) | H10N2Si4 | 150.43 | | |
| 17 | 291-56-5 | 1,3,5,2,4,6-Trithiatristannin (9CI) | H6S3Sn3 | 458.37 | | |
| 18 | 291-59-8 | Cyclohexasilane | H12Si6 | 180.61 | | |
| 19 | 291-61-2 | Aluminum, [1,3-butadiene-1,4-diolato(2-)-κO,κO']hydro- (9CI) | C4H5AlO2 | 112.06 | | |
| 20 | 291-64-5 | CYCLOHEPTANE | C7H14 | 98.19 | -12 °C | Soluble in water 30 mg @ 20°C. |
| 21 | 291-66-7 | Mercury, 1,3,5-hexatriene-1,6-diyl- (9CI) | C6H6Hg | 278.702 | | |
| 22 | 291-68-9 | 2H-Azepine | | | | |
| 23 | 291-69-0 | 1H-Azepine | C6H7N | 93.13 | | |
| 24 | 291-70-3 | Oxepine | | | | |
| 25 | 291-72-5 | Thiepin | C6H6S | 110.18 | | |
| 26 | 291-76-9 | 4H-1,2-Diazepine | | | | |
| 27 | 291-77-0 | 3H-1,2-Diazepine | | | | |
| 28 | 291-78-1 | 1H-1,2-Diazepine | C5H6N2 | 94.11 | | |
| 29 | 291-79-2 | 1,2-Oxazepine | | | | |
| 30 | 291-82-7 | 3H-1,2-Oxathiepin | | | | |
| 31 | 291-87-2 | 1H-1,3-Diazepine | | | | |
| 32 | 291-88-3 | 2H-1,3-Diazepine | | | | |
| 33 | 291-89-4 | 1,3-Oxazepine | | | | |
| 34 | 291-92-9 | 1,3-Dioxepin | C5H6O2 | 98.1 | | |
| 35 | 291-96-3 | 1,3-Dioxa-2-silacycloheptane (8CI,9CI) | C4H10O2Si | 118.21 | | |