名称:
                                Synthesis and crystal structure of thermochroic 2,6-di-tert-butyl-4-dimethylamino-4-(2-hydroxyphenyl) cyclohexadien-2,5-one
                             
                            
                                摘要:
                                The compound 2,6-di-tert-butyl-4-dimethylamino-4-(2-hydroxyphenyl)cyclohexadien-2,5-one is synthesized and its structure is studied.  The thermochromism of the compound is due to cleavage on excitation of the C(spiro)-N bond, which is lengthened to 1.512 angstrom under normal conditions, and O --> N proton transfer.  A deeply colored diphenoquinone and dimethylamine are formed.  The C(spiro)-N bond is lengthened due to mutual steric repulsion of the atoms bound to C4 and N.