Journal of the American Chemical Society

Synthesis of 9, 10-dimethyl-1, 2-benzanthracene and of a thiophene isolog

RB Sandin, LF Fieser

Index: Sandin; Fieser Journal of the American Chemical Society, 1940 , vol. 62, p. 3098,3103

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Citation Number: 26

Abstract

CHs V terial in an attempt to synthesize the isolog of 10-methyl-l, 2-benzanthracene. On condensing the free keto acid with excess methylmagnesium bromide by the procedure of Fieser and Neu~ man,~ a crystalline lactone (111) was obtained in GG% yield. Reduction to IV was accomplished in excellent yield by a procedure described by Newman6 for a comparable case, and cyclization of the acid with zinc chloride and acetic acid anhydride7 ...