. Hz, 38 (d, 1H, 4 J H2'-H6' = 1.9 Hz, p.43

C. Hz, 45 (d, 1H, 4 J H6'-H2' = 1.9 Hz, H 6' ) ; 9.82 (s, 1H, CHO) 13 C NMR (CDCl 3 , 75 MHz) ? ppm : -4.54 (s, 2C, Si(CH 3 ) 2 ) ; -4, p.35

C. Hz, 28 (s, 1C, C q tBu)37 (s, 1C, C' q tBu), p.14

C. Hz, 33 (s, 1C, C 2 )69 (s, 1C, C 2' )16 (d, 1C, 1 J C-P = 192.5 Hz, C=C-P)07 (s, 1C, C 6 ) ), p.263157

C. Hz, 96 (s, 1C, C 4' )54 (s, 1C, C 3 )01 (s, 1C, C 3' ) ; 190.90 (s, 1C, CHO). 31 P NMR (CDCl 3 , 81 MHz) ? ppm : 20.59 (s, P-OEt) MS (DCI, NH 3 , pos

C. Hz, 12 (s, 1C, CH 3 O)13 (s, 1C, C'H 3 O)82 (d, 2C, 2 J C-P = 5.3 Hz, CH 3 CH 2 O)65 (s, 1C, C 2' )60 (s, 1C, C 2 ), p.61

J. Hz, C. , 1. , and H. , 34 (dd, 1H, 3 J H-H = 17.5 Hz35 (d, 1H, 4 J H2'-H6' = 1.9 Hz, H6-H2 = 1.8 Hz, pp.720637-75

C. Hz, 54 (s, 1C, CH 3 O)63 (s, 1C, C'H 3 O), p.54

C. Hz, 22 (s, 1C, C 2 )63 (s, 1C, C 2' ) ; 111.02 (d, 1C, 1 J C-P = 188.5 Hz, C=C-P)72 (s, 1C, C 8 " ) ; 123.17 (s, 1C, C 3 " ), p.321

1. and 1. Hc=n-), 03 (s, 1C, C 4 )44 (s, 1C, C 4' )06 (s, 1C, C 3 )54 (s, 1C, C 3' ), p.699922

J. Ethyl, 1-yl)hydrazonomethyl-5,5'- biphenyl]vinylphosphonofluoridate hydrochloride (17) Compound 17 was synthesized from 13 (80 mg, 0.19 mmol) as compound 16. The residue was purified by silica gel chromatography (EtOAc) to give pure 17 (93 mg, 83%) as a yellow solid, p.8012

C. Hz, 21 (dd, 1H, 3 J H-H = 17, Hz, 2 J H-P = 20.3 Hz, p.99

1. Dd, J. , J. Hz, and C. , 67 (d, 1H, 4 J H6'-H2' = 1.8 Hz, H 6' )39 (s, 1H, HC=N), Hz, vol.740, issue.8 2, pp.74-87

. Mhz-)-?-ppm, 92 (s, 1C, CH 3 CH 2 O)90 (s, 1C, CH 3 O)93 (s, 1C, C'H 3 O), p.8

. Hz, 68 (s, 2H, HC=N)92 (s, 2H, H 2' ). 13 C NMR (DMSO-d 6 , 75 MHz) ? ppm : 56.55 (s, 2C, CH 3 O), p.7035

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