What is the melting point of meso-stilbene dibromide?

1 Answer
Truong-Son N.
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)

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