Reaction of dimethyl acetylenedicarboxylate with derivatives of malonic acid: pentamethoxycarbonylcyclopentadienide anion, tetramethoxy-carbonylcyclopentadienone, cyanotetramethoxyfulvenolate anion, and related compounds
作者:R. C. Cookson、J. B. Henstock、J. Hudec、B. R. D. Whitear
DOI:10.1039/j39670001986
日期:——
formulation of the adducts of dimethyl malonate with dimethyl acetylenedicarboxylate in the presence of pyridine and acetic acid as tautomeric octamethyl cycloheptadienoctacarboxylates [(III) and (IV)] is confirmed. Both tautomers, or the analogues from other esters of malonic acid, are converted by potassium acetate into Diels' potassium pentamethoxycarbonylcyclopentadienide (VIa). Diazomethane methylates
确认了在吡啶和乙酸存在下,丙二酸二甲酯与乙炔二甲酸二甲酯的加合物作为互变异构八甲基环庚二烯八羧酸酯[(III)和(IV)]的改进配方。互变异构体或丙二酸其他酯的类似物均被乙酸钾转化为Diels的五甲氧基羰基环戊二烯酸钾(VIa)。重氮甲烷将非常强的酸的游离环戊二烯甲基化为C-甲基衍生物(Vb),容易水解为1,2,3,4-四甲氧基羰基-5-甲基环戊二烯阴离子(VIII)。通过用氯或溴处理盐(VIa)形成的C-氯和溴衍生物(Vd和e)是强卤化剂。