By Alan R. Katritzky
(from preface)The 7th quantity of Advances in Heterocyclic Chemistry contains surveys of 4 teams of heterocyclic compounds; furans (P. Bosshard and nil. H. Eugster), dithiolium salts (H. Prinzbach and E. Futterer), 1,3,4-oxadiazoles (A. Hetzheim and ok. Mockel), and diquinolylme-thanes (G. Scheibe and E. Daltrozzo). extra chapters take care of purposes of mass spectrometry to heterocycles (G. Spiteller), a space which has extended very swiftly of overdue, and the halogenation of heterocycles (J. J. Eisch). ultimately, a precis is given of studies within the heterocyclic box, categorised by way of topic (A. R. Katritzky and S. M. Weeds), which it's was hoping can be of tips in literature surveys.Suggestions are welcomed for contributions to additional volumes; they need to be within the type of a quick synopsis.Thanks are end result of the Editorial Board, the publishers, and the authors for his or her cooperation.
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Additional resources for Advances in Heterocyclic Chemistry
I. This relationship is undoubtedly responsible for much of the intensive theoretical and experimental investigation currently being carried out on these systems. ’ Until a few years ago, however, the cations 1 and 2 had aroused little interest. In 1947 Liittringhaus and Bottche? 8 Thus these “ trithionium salts” were the first derivatives of the 1,2-dithiolium ion to be identified with certainty. Hurtley and Smiles4 had isolated fused-ring derivatives of 2 as early as 1926, but were understandably unable to find a satisfactory explanation for the valence relationships on the basis of the views held at that time.
H. Perkin, Ann. 157, 115 (1871). 76 H. Gilman and J. Eisch, J. Am. Chem. SOC. 79,5479 (1957). 72 73 22 JOHN J. EISCH [SEC. 3 agents formally classifiable as radical-promoted reagents also appear to favor C, over C, for pyridinoid heterocycles. , phenanthridine a t C-2 (S)], and less frequently ortho. With phenazinesle~6 1 or with l 2 under highly acidic conditions, the benzene ring ben~opyridines~p is attacked a t positions ortho to the hetero ring. With competing heteroatoms (Y and Z ) the order of orientation control is N > 0 > S ( 9 ) (phenoxazine at C-364,phenoxathiin a t C - P ) .
Whether the spectra of the aged solutionsare also due to the equilibrium [Eq. (S)] or whether the marked changes in absorption and conductivity betoken an unknown reactionS3cannot now be decided. Nevertheless, the characterization of isolated complexes both of unipositive iodine [ ( ~ y r i d i n e ) ~ I N(pyridine),IC104, O~, and (pyridine)IOCOCBH532]and of bromine [(pyridine),BrC104, (quinoline),BrC104, and (isoquinoline)zBrC10434]supports their occurrence as solution species. 21, ~ o m p l e xone , ~ might entertain the ion pair (pyridine),X+X,- as a reasonable solution model for 1 : 1 complexes.