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b) Cf. also D. M. Birney, J. Org. Chem. 1996, 61, 243-251; R. Koch, M. W. Wong, C. Wentrup, ibid. 1996, 61, 6809-6813.
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c) B. Fulloon, H. A. A. El-Nabi, G. Kollenz, C. Wentrup, Tetrahedron Lett. 1995, 36, 6547-6550;
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Preliminary communication: H. Bibas, M. W. Wong, C. Wentrup, J. Am. Chem. Soc. 1995, 117, 9582-9583.
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85036445011
-
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note
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All molecules having the structures 1 or 2 are defined as s-trans, regardless of the nature of R.
-
-
-
-
24
-
-
85036443763
-
-
note
-
s-cis) obtained at the B 3-LYP/6-31 G* level. It ignores the unknown errors in the calculated ε values;
-
-
-
-
25
-
-
85036440072
-
-
note
-
-1 at 70 K.
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29
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0000831564
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H. H. Wasserman, J. U. Piper, E. V. G. Dehmlow, J. Org. Chem. 1973, 38, 1451-1455.
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85036440412
-
-
note
-
All the bands observed were in very good agreement with the literature [12].
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32
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0001636404
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J. K. Terlouw, P. C. Burgers, J. L. Holmes, J. Am. Chem. Soc. 1979, 101, 225-226.
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0029966520
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b) Y. Chiang, H.-X. Guo, A. J. Kresge, O. S. Tee, ibid. 1996, 118, 3386-3391;
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0001215795
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e) M. T. Nguyen, D. Sengupta, G. Raspoet, L. G. Vanquickenborne, ibid. 1995, 99, 11883-11888.
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40
-
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85036444888
-
-
note
-
-1.
-
-
-
-
41
-
-
85036446014
-
-
note
-
-1 is also observed due to the formation of unsubstituted vinylketene in a retroene reaction, which will be described in a separate paper [21 b].
-
-
-
-
44
-
-
0343131618
-
-
b) Propyne formation from 5b may involve elimination of ethene to give allene carboxylic acid, followed by known dccarboxylation to give propyne: J. W. Dallinga, N. M. M. Nibbering, A. J. H. Boerboom, J. Chem. Soc. Perkin Trans 2, 1983, 281-284;
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45
-
-
85036446247
-
-
note
-
-1) was formed from 5b at 900°C.
-
-
-
-
46
-
-
85036442222
-
-
note
-
2 and propyne, respectively, increased drastically.
-
-
-
-
47
-
-
0001682413
-
-
b) The FVT-MS technique (Kratos MS 25 RFA) is described in C. Wentrup, P. Kambouris, R. A. Evans, D. Owen, G. Macfarlane, J. Chuche, J. C. Pommelet, A. Ben Cheikh, M. Plisnier, R. Flammang, J. Am. Chem. Soc. 1991, 113, 3130-3135.
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48
-
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85036444762
-
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note
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-
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49
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84970541321
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a) R. F. C. Brown, K. J. Coulston, F. W. Eastwood, A. D. E. Pullin, A. C. Staffa, Aust. J. Chem. 1990, 43, 561-577;
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53
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85036449533
-
-
note
-
-1 above s-cis-4d (G2(MP2,SVP));
-
-
-
-
54
-
-
85036440012
-
-
note
-
-1 below s-cis-4a;
-
-
-
-
55
-
-
85036440795
-
-
note
-
-1 below s-trans-4c and 32 kJ/mol below s-cis-4c.
-
-
-
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57
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0009780705
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b) L. A. Curtiss, P.C. Redfern, B. J. Smith, L. Radom, J. Chem. Phys. 1996, 104, 5148-5152.
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