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By G.W. Gribble, Thomas L. Gilchrist

This quantity of development in Heterocyclic Chemistry(PHC) is the 13th annual overview of the literature, overlaying the paintings released on vital heterocyclic ring structures in the course of 2000. during this quantity there are really good stories. the 1st, by means of H. Ila, H. Junjappa and P.K. Mohanta, covers their paintings on annulation utilizing ∝-oxoketene dithioacetals, a man-made strategy that offers worthy routes to an impressively wide selection of fused heterocycles. the second one, via R. N. Warrener, is at the synthesis of fused 7-azanorbornanes. The 7-azanorbornane structural unit is included right into a sequence of chic polycyclic molecules with inflexible geometry.The next chapters, prepared by way of expanding heterocycle ring measurement, evaluation fresh advances within the box of heterocyclic chemistry with emphasis on synthesis and reactions.

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M. S. Chauhan, H. Junjappa, Tetrahedron 1976, 32, 1911. R. R. Rastogi, A. Kumar, H. Ila, H. Junjappa J. Chem. Soc,. Perkin Trans 1 1978, 549. Review on Indazolone: L. Baiocchi, G. Corsi, G. Palazzo, Synthesis 1978, 633. A. Kumar, H. Junjappa, J. Chem. (S) 1979, 268. The Junjappa-Ila (J1) Heteroaromatic Annulation 79JCR(M)3001 81AHC171 81JOC5031 81ZC69 82JOC3027 82S203 82S693 84CHEC(4)313 84CHEC(5)274 84CHEC(6) 114 84JCS(P1)921 84TL5095 85IJC466 85S163 86JA6808 87TL3023 88TH48 88TH58 88TH99 88TL501 88TL6633 89PHC(1)l 90C406 90JCS(P1)2909 90PAC1967 90T577 90T2561 90T3703 90T4295 90T5423 90TH141 91COS(5)1065 91S889 92TL6173 93IJC(B) 1173 93JCS(P1)l 119 B-93MI257 93S241 93S245 23 A.

Ila, C. V. Asokan, Tetrahedron 1990, 46, 5423. A. K. D. Thasis, North Eastern Hill University, Shillong India 1990, p. 141-183. W. D. Wulff in "Comprehensive Organic Synthesis" B. M. Trost, I. , Pergamon Press, Vol. 5, p. 1065-1113. J. Satyanarayan, H. Ila, H. Junjappa, Synthesis 1991, 889. J. Satyanarayan, K. R. Reddy, H. Junjappa, H. Ila, Tetrahedron Lett. 1992, 33, 6173. S. K. Sharma, R. T. Chakrasali, H. Ila, H. Junjappa, Indian J. Chem. B, 1993, 1173. V. J. Aran, J. L. Asensio, J. R. Ruiz, M.

N. Warrener reduced access to attack at the n-bonds <99MI02>. The third member 140 has yet to be investigated in detail. ,~~ E 138 E N N 139 E ~ O E E 140 Figure 9 Building BLOCKs with rod-like structure The CO[n]polynorbomane frames have found use in the preparation of cavity bis-(crown ether) systems and modelled structures of the frames used in that study are shown in Figure 10. The curvature of the frame remained constant in the three systems, however the phenylene rings attached at the termini changed relative orientations as the frame size lengthened such that the centre to centre distance between the aromatic rings varied only slightly while their orientation moved from highly divergent in [7]polynorbomane 142, towards parallel in [ll]polynorbomane 144.

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