摘要 |
A diphosphonic acid ester of formula [VII] or [VII'] and a diphosphonium salt of formula [VIII] or [VIII'] are provided: wherein R<SUP>75</SUP>, R<SUP>76</SUP>, R<SUP>75'</SUP> and R<SUP>76'</SUP> may be the same or different and independently represent an alkyl or alkenyl group having from 1 to 4 carbon atoms, a cyclohexyl group or a phenyl group, R<SUP>77</SUP>, R<SUP>78</SUP>, R<SUP>79 </SUP>and R<SUP>80 </SUP>may be the same or different provided that at least three thereof are cyano groups and the others independently represent a hydrogen atom, a cyano group, a nitro group or a halogen atom, R<SUP>77'</SUP>, R<SUP>78'</SUP>, R<SUP>79'</SUP> and R<SUP>80'</SUP> may be the same or different and independently represent a group selected from a hydrogen atom and a halogen atom provided that at least three thereof are fluorine atoms and X represents a halogen atom. These compounds are useful as synthetic intermediates for the preparation of luminescent bis(aminostyryl)benzene compounds.
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