Derivatives of naphtho[2,3-c]pyran-5,10-dione ; a simple synthesis and a note of their chromogenic properties.
作者:Michael F. Aldersley、Francis M. Dean、Ahad S. Hamzah
DOI:10.1016/s0040-4039(00)83990-8
日期:1986.1
Appropriate N-ylides convert 2-methyl-1,4-naphthoquinone into 3-(acylmethyl) derivatives which can be cyclised to naphtho[2,3-c]pyran-5,10-diones by treatment with bromine and dehydrobromination with triethylamine; these diones give a variety of striking colours in acid media.