3,5-ditert-butyl-4-imino-1-phenylcyclohexa-2,5-dien-1-ol

2,4,6-tritert-butyl-N-difluoroboranylaniline

2,4,6-tritert-butyl-4-hydroxycyclohexa-2,5-dien-1-one

2,6-ditert-butyl-4-nitroaniline

mesityl isocyanate