Unlike other electron-deficient pyridazines, the title compound 1 is found to represent a valuable synthon for hetero Diels–Alder reactions with different unactivated dienophiles.
Reactions of 4,5-dicyanopyridazine with alkynes and enamines: A new straightforward complementary route to 4-mono- and 4,5-disubstituted phthalonitriles
作者:Stefania Turchi、Rodolfo Nesi、Donatella Giomi
DOI:10.1016/s0040-4020(97)10389-1
日期:1998.2
The preparation of the 1,2-dicyanobenzenes 6a-m in fairly good to excellent yields by one-pot procedures based on [4+2] cycloaddition processes of the title compound 1 with acetylenic or enamine dienophiles, is reported; some features of this new synthetic strategy are emphasized. (C) 1998 Elsevier Science Ltd. All rights reserved.
Über siliciumaromatische Verbindungen I. Trimethylsilylphtalsäuren und davon abgeleitete Farbstoffe
作者:H. Hopff、P. Gallegra
DOI:10.1002/hlca.19680510203
日期:1968.1.31
The 3- and 4-trimethylsilyl-phthalic anhydrides have been prepared by oxidation of the corresponding o-xylenes and converted into dyestuffs of the type of phthalocyanines, phthaleins and chinophthalones.