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Ser. , 1977, 1399. J. Hambrecht, Synthesis, 1977, 280. H. D. Scharf and E. Wolters, Chem. , 1978, 111, 639. V. I. Dulenko, N. N. Alekseev, V. M. Golyak, and L. V. Dulenko, Khim. geterorsiki. Soedinenii, 1977, 1135. S. I. Pennanen, J. , 1977, 14, 745. 68 1844 1 (129) (130) Reactions. ” Anodic methoxylation of 2-(2-thienylmethyl)-furan yields a mixture of geometrically isomeric adducts 63 H. Duerr and H. J. Ahr, Tetrahedron Letters, 1977,1991. 64 J. Bachelet, P. Demerseman, and R. Royer, J. , 1977,14,1409.

Brush, Tetrahedron Letters, 1977,419. I. G. Bolesov, L. G. Zaitseva, V. V. Plemenkov, I. B. Avezov, and L. S. Surmina, Zhur. org. , 1978, 14, 71. ~~ 1,3-Diphenylisobenzofuro[5,6-d]tropone (185) has been prepared from the dialdehyde (182) by the following sequence: reaction with N-phenylmaleimide gave a cycloadduct, which existed in the cyclic hydrated form (183); condensation of the latter with acetone yielded (184), which on heating underwent Diels-Alder fragmentation to the OHC O H\C G 0 0 HO Ph NPh 0 1‘‘ Ph (184) 91 92 93 (185) R.

L. Goldfwb and S. 2. -Vses. Soveshch. Org. Kristallokhim. lst, 1974,52 (Chem. , 1977,87,101 823). 99 ( a ) A. Almqvist and R. , p. 120. loo P. Meunier and G. Pfister-Guillouzo, Canad. J. , 1977,55,2867. lo' A. Ismailov, E. I. Mamedov, and V. G. Ibragimov, Zhur. org. , 1977,13,2612. Pocar, L. M. possi, R. Stradi, and P. S. Perkin I, 1977,2337. lo3 S. Rajappa and R. Sreenivasan, Indian J. , 1977,15B,301. "' Oxidative coupling of the enol ester (202), prepared from 2-acetylthiophen and trimethylsilyl chloride, yields the diketone (203), which is transformed into 2,2',5',2"-terthienyl(204)by the action of hydrogen sulphide.

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