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20
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5244272077
-
-
note
-
In principle, a 1,3-diaza-1,3-butadiene bearing at least one hydrogen at position-4 and a leaving group at position-1 should also lead to pyrimidines with activated acetylenes. 1,4-Bis(dimethylamino)-2-phenyl-1,3-butadiene was synthesized for this purpose and found to not undergo cycloaddition with DMAD under a wide variety of neutral and acidic (Brønsted, Lewis) conditions (R. Greenhouse. Unpublished observations).
-
-
-
-
21
-
-
0026692718
-
-
For a preliminary communication on these aspects of our studies, see: Guzmán, A.; Romero, M.; Talamás, F. X.; Muchowski, J. M. Tetrahedron Lett. 1992, 33, 3449.
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Guzmán, A.1
Romero, M.2
Talamás, F.X.3
Muchowski, J.M.4
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22
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5244379086
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G. Theime: Stuttgart
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Pielartzik, H.; Irmisch-Pielartzik, B.; Eicher, T. In Houben-Weyl, Methoden der Organischen Chimie; G. Theime: Stuttgart, 1985; Teil I, Vol. E5, pp 813-815.
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Pielartzik, H.1
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Eicher, T.3
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23
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0008515415
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Snytham, F. H.; Greth, W. E.; Langerman, N. R. J. Org. Chem. 1968, 34, 292. Mohashi. E.; Gordon, E. M. Synth. Commun. 1984, 14, 1159.
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Langerman, N.R.3
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24
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0008515415
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Snytham, F. H.; Greth, W. E.; Langerman, N. R. J. Org. Chem. 1968, 34, 292. Mohashi. E.; Gordon, E. M. Synth. Commun. 1984, 14, 1159.
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Mohashi, E.1
Gordon, E.M.2
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25
-
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5244276963
-
-
note
-
The authors have deposited atomic coordinates for this structure with the Cambridge Crystallographic Data Centre. The coordinates can be obtained, on request, from the Director, Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK.
-
-
-
-
28
-
-
85085780642
-
-
4 at 31°C, isobutylene has absorptions at δe; 1.68 and 4.63. Rumens, F. H. A.; Lomas, J. S.; Tiflon, B.; Coupry, C.; Lumbroso-Bader, N. Org. Magn. Reson. 1982, 19, 35.
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Tiflon, B.3
Coupry, C.4
Lumbroso-Bader, N.5
-
29
-
-
5244267109
-
-
note
-
It is noteworthy that the Boc-azadiene 24b is recovered unchanged after heating in xylenes for 6 h in the absence of DMAD.
-
-
-
-
33
-
-
5244352348
-
-
note
-
25
-
-
-
-
35
-
-
85085782939
-
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Ger. Patent 671,785, 1939
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a = 12.4; Albert, A.; Paal, B. Ibid.).
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Dachlauer, K.1
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36
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2742510834
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a = 12.4; Albert, A.; Paal, B. Ibid.).
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-
-
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39
-
-
5244256151
-
-
note
-
Such addition products were also obtained in the cycloaddition reactions of the diazadienes 23, 31, and 33.
-
-
-
-
40
-
-
0000239817
-
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Kornblum, N.; Michel, R. E.; Kerber, R. C. J. Am. Chem. Soc. 1966, 88, 5660. Kornblum, N.; Davies, T. M.; Earl, G. W.; Holy, K. L.; Kerber, R. C.; Musser, M. T.; Snow, D. H. J. Am. Chem. Soc. 1967, 89, 725.
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