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Ph
Ph
Ph
Ph
1. 2 LDA
HO
OH
2.
CH
2
O
n
t
-Bu
t
-Bu
t
-Bu
t
-Bu
38
,76%
37a
Ph
Ph
P
2
O
5
, 110 °C, 15 min
39
,73%
Scheme 7
Ring expansions to 17,18-diphenyldibenzo[
a
,
o
]pentaphene (
39
)[
42
]
Ph
Ph
D
E
Ph
Ph
A
C
B
t
-Bu
t
-Bu
40
Fig. 10
ORTEP drawing and molecular structure of molecular spiral staircase
40
[
43
]. Reprinted
with permission from [
43
]. Copyright (2004) American Chemical Society
derivatives
41a
,
41b
, and
41c
, respectively (Fig.
11
)[
44
]. The X-ray structures of
41a
and
41c
again exhibit helical twists of the diindenophenanthrenyl framework
with the heteroaryl groups in parallel orientation with each other.
The presence of two terpyridyl groups in
41c
provides opportunities to form
dinuclear ruthenium(II) bis(terpyridine) complexes
44a
and
44b
bearing helical
