J. CHEM. RESEARCH (S), 1998 159
organic solutions by standard methods, except for compound 3c
which was obtained from the aqueous phase by acidi®cation.
Preparation of 1,1,2-Triphenylpropene (Typical Example).ÐThe
crude oily product of 3d obtained by the above described procedure
(using benzophenone as electrophile) was dissolved in a mixture of
EtOH (17 ml) and 10 M solution of HCl in H2O (2.5 ml). The
solution was boiled under re¯ux for 2 h then concentrated in vacuo.
The residue was puri®ed by column chromatography (Kieselgel,
eluent hexane) to yield pure product (5b, Table 2).
Table 2 Preparation of (Z)/(E)-stilbene derivatives
Yield (%)
(Z/E)
R1
H
R2
Product
Ref.
5a
66 (1:1)a 12, 15
5b
5c
5d
84
11, 13
14
This work was supported by the National Research
Foundation of Hungary (OTKA Grant T-014397).
89 (1:1)
85 (1:1)
Received, 26th August 1997; Accepted, 19th November 1997
Paper E/7/06203F
7
aThe crude product contained 1,2-diphenylbut-2-ene (20%).
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