Download Advances in Heterocyclic Chemistry, Vol. 27 by A.J.Boulton A.R. Katritzky PDF

By A.J.Boulton A.R. Katritzky

(from preface)Volume 27 comprises 4 contributions. Black and Doyle talk about '' l-Azabicyclo[3.1.0]hexanes and Analogs with extra Heteroatom Substitution.'' half II of the therapy of ''Heteroaromatic Radicals'' via Hanson bargains with radicals with staff VI heteroatoms and completes the evaluate of the heteroaromatic loose radicals began in quantity 25. In ''The 1,2- and 1,3-Dithiolium Ions.'' Lozac'h and Stavaux increase to this point the evaluate by way of Prinzbach and Futterer which seemed in 1966 in quantity 7 of this e-book. ultimately, Grimmett has up-to-date his personal evaluate of im-idazole chemistry which seemed in 1970 in quantity 12.

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Extra info for Advances in Heterocyclic Chemistry, Vol. 27

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Dorofeenko, and 0. Yu. Okhlobystin, Khim. , 318 (1977) [ C A 87,67593 (1977)l. 1 5 1 C. Hacquard and A . Rassat, Mol. Phys. 30, 1935 (1975). 1 5 2 E. Krumbholz and F. W . Streuber, Angew. , Int. Ed. Engl. 14, 553 (1975). 145 146 48 PETER HANSON [Sec. 40 G) by a factor of two. lS2In 31 and 32, the planes of the two heterocycles are expected to be essentially perpendicular for steric reasons ; thus, there should be no n-delocalization between the two moieties, unlike the case of 33. The fact that 31 exhibits a larger nitrogen splitting than 33, but a smaller N-proton splitting, is taken to imply effective spin transmission by hyperconjugation to the nitrogen atom in 31 and by homohyperconjugation to its attached proton, while the normal n-spin polarization mechanism obtains for 33 where conjugation exists.

O]hex-3-enes 133 are stable to further i r r a d i a t i ~ n . ~ ~ Oxazabicyclohexanes 134 have been postulated66 as undetected intermediates in the photolytic conversion of 2-acyl-1-pyrroline 1-oxides into pyrrolidinones and acyl pyrrolines. , 107). Deoxygenation reagents include55 thiourea, triphenylphosphine sulfide, potassium thiocyanate, potassium ethylxanthate, and potassium selenocyanate. O]hexanes 135 have been suggested5 as possible intermediates in some of these reactions. R 4 q ( - R 6 R3 R', R 2 = H or Me; R3= H, Me, or Ph; R4 = H or Me; R 5 = H or Me; R6 = H, Me, or Ph RZ (135) 63 64 65 66 D.

126) are formed. 60 Ph QJQMe Me ph

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