A. V. Patwardhan
Stony Brook University
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Featured researches published by A. V. Patwardhan.
Tetrahedron | 1968
Fausto Ramirez; A. V. Patwardhan; H.J. Kugler; C.P. Smith
Abstract The phosphorus of trisdimethylaminophosphine added to the oxygen of the α-diketone, benzil, and gave a 1:1 adduct. This adduct could be isolated in two crystalline forms: one of them was a triaminooxyphosphonium dipolar ion, and the other was a cyclic triaminodioxyphosphorane. Solutions of these crystalline adducts contained the same molecular species in equilibrium with each other. Certain solvents favoured the cyclic form with 5-coordinated phosphorus, while others favoured the dipolar ion with 4-coordinated phosphorus. The value of the P31 NMR shifts varied from +30·2 ppm vs H3PO4 in 0·8M hexane to +13·1 ppm in 1·2M methylene chloride solutions. In methylene chloride solutions, the value of the shift varied significantly with concentration. The 1:1 adducts made from the reactions of the 5-membered cyclic triaminophosphines 2-N-pyrrolidino-, 2-dimethylamino-, and 2-methoxy-1,3,2-diazaphospholanes with benzil existed exclusively as cyclic triaminodioxyphosphoranes in the crystalline state and in solutions. The reaction of acenaphthenequinone with the cyclic aminophosphines produced the corresponding aminophosphine oxides via unstable adducts with POC bonds, which were formed at −70°.
Journal of the American Chemical Society | 1967
Fausto Ramirez; A. V. Patwardhan; H.J. Kugler; C. P. Smith
Journal of Organic Chemistry | 1967
Fausto Ramirez; S. B. Bhatia; A. V. Patwardhan; C. P. Smith
Journal of the American Chemical Society | 1965
Fausto Ramirez; A. V. Patwardhan; N. Ramanathan; N. B. Desai; C. V. Greco; S. R. Heller
Journal of the American Chemical Society | 1964
Fausto Ramirez; A. V. Patwardhan; Stephen R. Heller
Journal of the American Chemical Society | 1965
Fausto Ramirez; A. V. Patwardhan; C. P. Smith
Journal of the American Chemical Society | 1965
Fausto Ramirez; A. V. Patwardhan; N. B. Desai; S. R. Heller
Journal of Organic Chemistry | 1968
Fausto Ramirez; S. B. Bhatia; A. V. Patwardhan; Eugene H. Chen; C. P. Smith
Journal of Organic Chemistry | 1965
Fausto Ramirez; A. V. Patwardhan; C. P. Smith
Journal of the American Chemical Society | 1963
Fausto Ramirez; A. V. Patwardhan; N. B. Desai; N. Ramanathan; C. V. Greco