(Pyrazolylborate)zinc Organophosphate Complexes Resulting from Hydrolytic Cleavage of Phosphate Esters

✍ Scribed by Karl Weis; Michael Rombach; Michael Ruf; Heinrich Vahrenkamp

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 545 KB
• Volume: 1998
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199802)1998:2<263::aid-ejic263>3.0.co;2-t

✦ Synopsis

Five different (pyrazolylborate)zinc hydroxide complexes nitrophenyl) phosphates showed intermediate reactivity, losing p-nitrophenolate upon hydrolysis and producing Tp* Tp*ZnϪOH (1) were used as hydrolytic reagents towards esters of various acids of phosphorus. Trimethyl phosphate ZnϪOPO(OR)(OC 6 H 4 NO 2 ) (7, 8). When phosphorus acid diesters were employed, condensation between the ZnϪOH and trimethyl phosphite could not be cleaved. Dimethyl and diphenyl phosphite yielded Tp tBu,Me ZnϪOPHO(OR) (2, 3). and PϪOH functions occurred. This proved to be the convenient way of preparing the organophosphate complexes Tp* Triphenyl phosphate reacted slowly producing moderate yields of Tp*ZnϪOPO(OPh) 2 (4). Tris(p-nitrophenyl) phos-ZnϪOPO(Ph) 2 (9), Tp*ZnϪOPO(OPh) 2 (4), and Tp*ZnϪO-PO(OC 6 H 4 NO 2 ) 2 (5). Six structure determinations showed phate was cleaved rapidly, forming Tp*ZnϪO-PO(OC 6 H 4 NO 2 ) 2 (5) and Tp*ZnϪOC 6 H 4 NO 2 (6). Alkylbis(p-the structural variability of the resulting complexes.