The reactivity of 1,2-alkadienephosphonates in nucleophilic addition reactions has been investigated.General procedure for preparation of 14 -17 To a solution of 6, 7, 8, 9, 10, 11, 12, or 13 in dry diethyl diethyl ether a 10% HCl was added and the mixture was stirring overnight. After standard work-up the residue was purified (hexane: ethylacetate 1:4). [3] Compound characterization 14. Dimethyl(3-methyl-2-oxopentyl)phosphonate, C 8 H 17 O 4 P; Calcd.: P 14.88, Found: P 14.66 %; IR: (cm -1 ) 1720 (C=C) , 1256 (P=O), 980 (P-O-C), 1 H NMR (CDCl 3 ): /ppm 3.39(d, 3 J HP 10.09Hz, 6H, (OMe)); 3.29(dt, 2 J HH 5.8Hz, 1H(CH)); 2.93(d, 2 J HP 11.9Hz, 2H(P-CH 2 )); 1.68(q, 3 J HH 7.0Hz, 3 J HH 8.0Hz, 2H(CH 2 -CH 3 )); 1.46(d, 3 J HH 6.8Hz, 3H, CHCH3)); 0.91(t, 3 J HH 8.0Hz, 3H, (CH 2 -CH3)); 31 P NMR(CDCl 3 ) /ppm: 31 P 17.1; pale yellow oil; Yield (%) 78 15. Methyl N,N-diethyl-P-(3-methyl-2-oxopentyl)phosphonoamidate, C 11 H 24 NO 3 P; Calcd.: P 12.42, Found: P 12.30 %; IR: (cm -1 ) 1700 (C=C) , 1238 (P=O), 980 (P-O-C), 1 H NMR (CDCl 3 ): /ppm 3.39(d, 3 J HP 10.09Hz, 3H, (OMe)); 3.09(t, 2 J HH 5.8Hz, 1H(CH)); 2.50(d, 2 J HP 11.9Hz, 2H(P-CH 2 )); 2.93(m, 3 J HP 13.6Hz, 3 J HH 7.2Hz, 2H, (CH 3 -CH 2 -N)); 1.00 (t, 3 J HH 7.2Hz, 3H, (CH 3 -CH 2 -N)); 1.68(q, 3 J HH 7.0Hz, 3 J HH 8.0Hz, 2H(CH 2 -CH 3 )); 1.40(d, 3 J HH 6.8Hz, 3H, CHCH3)); 0.89(t, 3 J HH 8.0Hz, 3H, (CH 2 -CH3)); 31 P NMR(CDCl3) /ppm: 31 P 16.9; pale yellow oil; Yield (%) 84 16. 1-(dimethylphosphoryl)-3-methylpentan-2-one C 8 H 17 O 2 P; Calcd.: P1 7.57, Found: P 17.49 %; IR: (cm -1 ) 1708 (C=C) , 1238 (P=O), 980 (P-O-C), 1 H NMR (CDCl 3 ): /ppm 3.09(t, 2 J HH 5.8Hz, 1H(CH)); 2.50(d, 2 J HP 11.9Hz, 2H(P-CH 2 )); 1.76(d, 2 J HP 16.6Hz, 6H(CH 3 -P)); 1.68(q, 3 J HH 7.0Hz, 3 J HH 8.0Hz, 2H(CH 2 -CH 3 )); 1.40(d, 3 J HH 6.8Hz, 3H, CHCH3)); 0.89(t, 3 J HH 8.0Hz, 3H, (CH 2 -CH3)); 31 P NMR(CDCl 3 ) /ppm: 31 P 17.6; oil; Yield (%) 81. 17. 1-(diphenylphosphoryl)-3-methylpentan-2-one, C 28 H 21 O 2 P; Calcd.: P 7.37, Found: P 7.17 %; IR: (cm -1 ) 1698 (C=C) , 1238 (P=O), 980 (P-O-C), 1 H NMR (CDCl 3 ): /ppm 7.29-7.17(m, 2H, (Ph)); 7.05(d, 2JHH 7.75Hz, 1H, (Ph)); 6.89(t, 2JHH 7.25Hz, 2H, (Ph)); 3.09(t, 2 J HH 5.8Hz, 1H(CH)); 2.50(d, 2 J HP 11.9Hz, 2H(P-CH 2 )); 1.68(q, 3 J HH 7.0Hz, 3 J HH 8.0Hz, 2H(CH 2 -CH 3 )); 1.40(d, 3 J HH 6.8Hz, 3H, CHCH3)); 0.89(t, 3 J HH 8.0Hz, 3H, (CH 2 -CH3)); 31 P NMR(CDCl3) /ppm: 31 P 17.0; oil; Yield (%) 85. ConclusionsThe results obtained by us confirm once again the general mechanism of the reaction of nucleophilic addition of alcohols to 1,2-alkadienephosphonates, i.e. with formation of 1,2-and 2,3adducts.
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