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(Pyrazolylborate)zinc Organophosphate Complexes Resulting from Hydrolytic Cleavage of Phosphate Esters
Author(s) -
Weis Karl,
Rombach Michael,
Ruf Michael,
Vahrenkamp Heinrich
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199802)1998:2<263::aid-ejic263>3.0.co;2-t
Subject(s) - chemistry , phosphate , hydrolysis , zinc , hydroxide , trimethyl phosphate , reagent , phosphorous acid , tris , zinc hydroxide , reactivity (psychology) , phosphorus , inorganic chemistry , medicinal chemistry , nuclear chemistry , organic chemistry , medicine , biochemistry , alternative medicine , pathology
Five different (pyrazolylborate)zinc hydroxide complexes Tp*Zn−OH ( 1 ) were used as hydrolytic reagents towards esters of various acids of phosphorus. Trimethyl phosphate and trimethyl phosphite could not be cleaved. Dimethyl and diphenyl phosphite yielded Tp t Bu,Me Zn−OPHO(OR) ( 2 , 3 ). Triphenyl phosphate reacted slowly producing moderate yields of Tp*Zn−OPO(OPh) 2 ( 4 ). Tris( p ‐nitrophenyl) phosphate was cleaved rapidly, forming Tp*Zn−OPO(OC 6 H 4 NO 2 ) 2 ( 5 ) and Tp*Zn−OC 6 H 4 NO 2 ( 6 ). Alkylbis( p ‐nitrophenyl) phosphates showed intermediate reactivity, losing p ‐nitrophenolate upon hydrolysis and producing Tp*Zn−OPO(OR)(OC 6 H 4 NO 2 ) ( 7 , 8 ). When phosphorus acid diesters were employed, condensation between the Zn−OH and P−OH functions occurred. This proved to be the convenient way of preparing the organophosphate complexes Tp*Zn−OPO(Ph) 2 ( 9 ), Tp*Zn−OPO(OPh) 2 ( 4 ), and Tp*Zn−OPO(OC 6 H 4 NO 2 ) 2 ( 5 ). Six structure determinations showed the structural variability of the resulting complexes.