1690
A. Loupy et al. / Tetrahedron 60 (2004) 1683–1691
Table 7. GC analysis (vector gas is helium (50 kPa) in all cases)
a
rt (min)
a
rt (min)
GC column, temperature programme
Compound
Internal standard
OV-1 (12 m£0.22 mm i.d., film thickness 0.1 mm), injector
and detector at 250 8C
8
1
4.65
Ethyl diethylmalonate
5.60
a
0–150 8C with 10 8C min then 150–220 8C with 5 8C min
21
21
1a
2
9.59
5.46
CP-Sil 5CB (25 m£0.32 mm i.d., f. th. 0.12 mm), injector and
Propyl phthalate
10.36
detector at 280 8C
2
1
8
0–250 8C with 10 8C min
CP-Sil 5CB (idem)
Injector and detector at 280 8C, 1002250 8C with 10 8C min
2a
2
2c
3
7.43
4.08
7.29
2.69
Diethyl phthalate
Ethyl benzoate
6.50
6.82
21
OV-1 (12 m£0.22 mm i.d., film thickness 0.1 mm), injector and
detector at 280 8C
0 8C during 2 min then 50–250 8C with 10 8C min
21
5
3a
13.9
a
rt, retention time.
solvent at high temperature with computed values on
isolated molecule at 0 K. We checked for the reaction 1
that Zero Point Energy (ZPE) corrections reaction do not
affect significantly the energy barriers of activation.
Kokje, J. P.; Overhand, M.; Lie, T. S.; Maat, L. Rec. Trav.
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1723–1724. (e) Bose, A. K.; Manhas, M. S.; Ghosh, M.; Shah,
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We thank sincerely C.N.R.S. (National Center for Scientific
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One of us (A. S. G.) acknowledges the French Embassy in
Bratislava (Slovakia) for a fellowship grant.
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