10549-25-4

Basic information

• Product Name: Pyrene, 4,5,9,10-tetrahydro-2,7-dimethyl-
• Synonyms: Pyrene,4,5,9,10-tetrahydro-2,7-dimethyl;2,7-Dimethyl-4,5,9,10-tetrahydropyren
• CAS NO: 10549-25-4
• Molecular Formula: C18H18
• Molecular Weight: 234.341
• Mol File: 10549-25-4.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: Pyrene, 4,5,9,10-tetrahydro-2,7-dimethyl-(CAS DataBase Reference)
• NIST Chemistry Reference: Pyrene, 4,5,9,10-tetrahydro-2,7-dimethyl-(10549-25-4)
• EPA Substance Registry System: Pyrene, 4,5,9,10-tetrahydro-2,7-dimethyl-(10549-25-4)

Safety Data

• Hazardous Substances Data: 10549-25-4(Hazardous Substances Data)

Upstream product

• 27165-88-4 <2₃>(1,3,5)-cyclophane 
• 108-98-5 thiophenol 
• 27341-04-4 2,11,20-Trithia<3.3.3><1.3.5>cyclophan-trisulfon 

Relevant articles and documents

Novel annulene dications from methylated [2.2]metacyclophane monoenes and [e]-ring benzannelated dimethyldihydropyrene

Tetramethyl- and hexamethyl-substituted [2.2]metacyclophane monoenes (10 and 11) are transformed into their corresponding trans-dimethyldihydroethanophenanthrenium dications (142+ and 152+) in FSO3H·SbF5 (4:1) and FSO3H·SbF5 (1:1) with SO2ClF or SO2 as the solvent; these 10π-dications are equivalent to the C-4/C-5 diprotonated dications of the 2,7-dimethyl derivative of trans-DMDHP, 3a. The trans-12c,12d-dimethyl-12c,12d-dihydrobenzo[e]pyrene (6) reacts with FSO3H/SO2ClF under surprisingly mild conditions to give initially a persistent diprotonated dication (6H22+) and, subsequently, the oxidation dication (62+); the 62+:6H22+ ratio reaches 4:1 after 1 week at low temperature. Protonation of the anti-metacyclophane (13) was also examined. Charge delocalization mode and tropicity in the resulting dications are gauged via detailed NMR studies at 500 MHz.