| 1 | 287-00-3 | 2H-Cyclopenta[6,7]naphth[2,3-b]oxirene (9CI) | C13H8O | 180.2 | | |
| 2 | 287-03-6 | 1H-Cycloprop[b]anthracene | C15H10 | 190.24 | | |
| 3 | 287-05-8 | Anthra[2,3-b]oxirene (9CI) | C14H8O | 192.21 | | |
| 4 | 287-08-1 | CYCLOPENTADECENE OXIDE | C15H28O | 224.38 | 55-59°C | |
| 5 | 287-12-7 | Tricyclo[3.1.0.02,6]hexane | C6H8 | 80.13 | | |
| 6 | 287-13-8 | 1,2,3-Methylidynecyclohexane | C7H10 | 94.15 | | |
| 7 | 287-21-8 | 1,3,2,4-Diphosphadiborete | B2P2 | 83.57 | | |
| 8 | 287-23-0 | Cyclobutane | C4H8 | | | |
| 9 | 287-23-0 | CYCLOBUTANE | C4H8 | 56.11 | -80° | |
| 10 | 287-24-1 | AZETE | C3H3N | 53.06 | | |
| 11 | 287-25-2 | 2H-Oxete | C3H4O | | | |
| 12 | 287-26-3 | Phosphetane | C3H7P | 74.06 | | |
| 13 | 287-27-4 | Trimethylene sulfide | C3H6S | 74.14 | -73.24°C | |
| 14 | 287-28-5 | Trimethylene selenide | | | | |
| 15 | 287-29-6 | SILACYCLOBUTANE | C3H8Si | 72.18 | | |
| 16 | 287-31-0 | Mercury, [ethenolato(2-)-κC2,κO1]- (9CI) | C2H2HgO | 242.63 | | |
| 17 | 287-32-1 | 1,2-Diazacyclobutadiene | | | | |
| 18 | 287-33-2 | 1,2-Oxazetidine | C2H5NO | 59.07 | | |
| 19 | 287-36-5 | 1,2-Oxaphosphetane | C2H5OP | 76.03 | | |
| 20 | 287-37-6 | 1,2-Oxathietane | | | | |
| 21 | 287-41-2 | Mercury, [[(formaldehyde-κC) oximato-κO](2-)]- (9CI) | CHHgNO | 243.62 | | |
| 22 | 287-42-3 | 1,3-Diazacyclobutadiene | | | | |
| 23 | 287-44-5 | Triazete | CHN3 | 55.04 | | |
| 24 | 287-46-7 | 2H-1,3-Oxazete | | | | |
| 25 | 287-53-6 | 1,3-Dithietane | C2H4S2 | 92.18 | | |
| 26 | 287-54-7 | Copper, [methanedithiolato(2-)-κS,κS']- (9CI) | CH2CuS2 | 141.69 | | |
| 27 | 287-55-8 | 1,3-disilacyclobutane | C2H8Si2 | 88.25592 | | |
| 28 | 287-56-9 | Tetragermetane (9CI) | Ge4H8 | 298.62 | | |
| 29 | 287-59-2 | 1,3,2,4-Diazadiphosphetidine | H4N2P2 | 93.99 | | |
| 30 | 287-64-9 | Tetraphosphetane (8CI,9CI) | H4P4 | 127.93 | | |
| 31 | 287-65-0 | 1,3,2,4-Dithiadiphosphetane (8CI,9CI) | H2P2S2 | 128.09 | | |
| 32 | 287-66-1 | 1,3-Diphospha-2,4-disilacyclobutane (8CI,9CI) | H6P2Si2 | 124.17 | | |
| 33 | 287-68-3 | Cyclodisilaselenane (8CI,9CI) | H4Se2Si2 | 218.12 | | |
| 34 | 287-69-4 | Cyclotetrasilane | H8Si4 | 120.41 | | |
| 35 | 287-72-9 | Aluminum, [1-propen-1-olato(3-)-κC3,κO1]- (9CI) | C3H3AlO | 82.04 | | |
| 36 | 287-75-2 | Aluminum, hydro[2-(mercapto-κS)ethenolato(2-)-κO]- (9CI) | C2H3AlOS | 102.09 | | |
| 37 | 287-77-4 | 1H-Arsole | C4H5As | 128 | | |
| 38 | 287-81-0 | Gold, 1,3-butadiene-1,4-diylhydro- (9CI) | C4H5Au | 250.049 | | |
| 39 | 287-82-1 | Gold, [1,2-ethenedithiolato(2-)-κS,κS']hydro- (9CI) | C2H2AuS2 | 287.12 | | |
| 40 | 287-87-6 | 1H-Borole | C4H5B | 63.89 | | |
| 41 | 287-92-3 | Cyclopentane | C5H10 | 70.13 | -94 °C (lit.) | Miscible with ethanol, ether and acetone. Slightly miscible with water. |
| 42 | 287-93-4 | 1H-Germole | C4H6Ge | 126.73 | | |
| 43 | 287-94-5 | Mercury, 1,3-butadiene-1,4-diyl- (9CI) | C4H4Hg | 252.665 | | |
| 44 | 287-95-6 | 3H-Pyrrole | C4H5N | 67.09 | | |
| 45 | 287-97-8 | 1-Azacyclopentadiene | | | | |