What is the melting point of meso-stilbene dibromide?

1 Answer
Jan 27, 2016

The meso isomer, which has a mirror plane down its vertical symmetry axis, would be the ("R","S") stereoisomer, because mirroring the "R" configuration gives you the "S" configuration.

So, it looks like either of the above structures.

Based on the following references, I see that the melting point RANGE is close to 241^@ "C".

I used Scifinder and found two probable melting point ranges:

  • 239^@ ~ 241^@ "C"
    Schroth, Werner; Zeitschrift fuer Chemie 1977, V17(2), P56 CAPLUS

  • 236^@ ~ 237^@ "C"
    Fieser, Louis F.; Journal of Chemical Education 1954, V31, P291-7 CAPLUS
    Yusubov, M. S.; Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya 1991, (4), P868-73 CAPLUS)

And additional references also say about 241^@ "C".

http://www.cengage.com/chemistry/book_content/049501334X_gilbert/prelabs/f_z_msds_gilbert_withtoc.htm#_Toc122330419

https://www.nwmissouri.edu/naturalsciences/sds/0-9/1%202-Dibromo-1%202-diphenylethane.pdf (pg. 3)