By A. R. Katritzky, A. J. Boulton
(from preface)The current quantity comprises seven chapters, 5 of which take care of points of particular ring structures: 4-oxy- and 4-keto-l ,2,3,4-tetrahydroiso-quinolines (J. M. Bobbitt), the oxidation items of pyrroles (O. P. Gardini), the pyrindines (4- and 5-azaindenes) (F. Freeman), the NMR spectra of indoles (S. P. Hiremath and R. S. Hosmane), and the 1,2-benzoisothiazole-S-dioxides—(saccharin and its derivatives) (H. Hettler). within the basic box of heterocyclic chemistry, hydrogen trade reactions, in general on steel surfaces, are handled (G. E. Calf and J. L. Garnett), and the rest bankruptcy is a scientific assessment of heterocyclic oligomers (A. Albert and H. Yamamoto). the quantity is devoted to Professor Adrien Albert, and this Preface is through a short biography and bibliography.
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Sample text
On irradiation with ultraviolet light, cyclohexanone thioacetal produces the radical (36),which gives intermediary cyclohexanethione by the elimination of a HSCHzCHz radical from the side chain; this thione readily dimerizes t o afford the spiro-1,3-dithi- (37) R . M. , p. 30. Wiley (Interscience), New York, 1967. 52 Acheson,51 p. 9. 53 G. Stefanovic, L. Lorenc, R. I. Mamuzid, and M. L. Mihailovid, Tetmhedrom 6, 304 (1959). 54 I. M. Goldman, J. K. Larson, J. R. Tretter, and E. G. Andrews, J . Amer.
Cramer, Angew Chem. Int. Ed. Engl. 5, 173 (1966); (b)M. Ikehara, Kagaku no Ryoiki 25, 300 (1971). 172 40 A. ALBERT AND H. YAMAMOTO [Sec. C. Pterorhodine (1 13b)lS1and drosopterin (133)ls2are naturallyoccurring dimeric pteridines ; the former was synthesized from xanthopterin and acetone or acetaldehyde in the presence of ammonium sulfate or hydrogen peroxide, 136 and the latter from 7,8-dihydropterin and /I-keto-ahydroxybutyric acid. The complete structure of a large peptide macrocycle bearing two 2-quinoxalinyl substituents has been elucidated by Prelog and co-workers.
I57 J. Thesing, Ber. 87, 692 (1954). 158 G. 0. Burr and R. A. Gortner, J. Amer. Chem. SOC. 46, 1224 (1924). 159 R. A. Heacock and S. Kakppirek, Advan. Heterocycl. Chem. 10, 43 (1969). 155 Sec. 1 HETEROCYCLIC OLIGOMERS 37 be made. 160 have prepared compound 130 by the Grignard reaction of “thienylmagnesium bromide with methyl 3-(1-methylpiperidyl)carboxylate, followed by dehydration of the resulting carbinol with 10 N hydrochloric acid; 130, known as Asverin, is used as an antitussive. lB1The 2,2’-thenils (79;X = S , R=Fi-F, or 5-adamantyl) were made by the reaction of two molecules of the corresponding 2-lithiothiophene with dimethyl oxalate.