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1 Supporting Information for A new method for the synthesis of -aminoalkylidenebisphosphonates and their asymmetric phosphonylphosphinyl and phosphonyl-phosphinoyl analogues Anna Kuźnik, 1* Roman Mazurkiewicz, 1 Mirosława Grymel, 1 Katarzyna Zielińska, 1 Jakub Adamek, 1 Ewa Chmielewska, 2 Marta Bochno, 2 Sonia Kubica 1 Address: 1 Department of Organic Chemistry, Biochemistry and Biotechnology, Silesian University of Technology, B. Krzywoustego 4, Gliwice, Poland and 2 Department of Bioorganic Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, Wrocław, Poland Anna Kuźnik - Anna.Kuznik@polsl.pl * Corresponding author Tel: ; Fax: Experimental and analytical data Table of contents 1. Spectroscopic properties of all synthesized compounds 6 8 S2 S H NMR, 13 C NMR and 31 P NMR spectra of selected bisphosphoric acid esters 8.. S6 S17 S1
2 Diethyl 1-(N-acetylamino)-1-methoxymethylphosphonate (6a). Pale yellow oil. 1 H NMR (400 MHz, CDCl 3 ) δ 6.63 (br d, J = 6.8 Hz, 1H), 5.44 (dd, J 1 = 8.4, J 2 = 10.4 Hz, 1H), (m, 4H) a, 3.43 (s, 3H), 2.10 (s, 3H), 1.35 (t, J = 7.2 Hz, 3H) b, 1.32 (t, J = 7.0 Hz, 3H) b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ 170.8, 76.1 (d, J = Hz), 63.8 (d, J = 6.7 Hz) c and 63.1 (d, J = 6.8 Hz) c, 57.4 (d, J = 14.4 Hz), 23.2, (d, J = 5.3 Hz) b and (d, J = 5.3 Hz) b ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 16.8 ppm; IR (ATR) 3257, 1690, 1235, 1020 cm -1. HRMS (TOF-ESI) calcd for C 8 H 18 NO 5 PNa [M + Na] , found a Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). b Diastereotopic Et group (OCH 2 CH 3 ). c Diastereotopic Et group (OCH 2 CH 3 ). Diethyl 1-(N-acetylamino)-1-methoxyethylphosphonate (6b). Pale yellow oil. 1 H NMR (400 MHz, CDCl 3 ) δ 6.14 (br s, 1H), (m, 4H) a, 3.38 (s, 3H), 2.05 (s, 3H), 1.93 (d, J = 15.2 Hz, 3H), 1.36 (t, J = 7.2 Hz, 3H) b, 1.35 (t, J = 7.0 Hz, 3H) b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ 170.6, 85.0 (d, J = Hz), 63.9 (d, J = 6.9 Hz) c and 63.1 (d, J = 6.9 Hz) c, 50.4 (d, J = 9.8 Hz), 24.8, 18.2, (d, J = 5.3 Hz) b and (d, J = 6.1 Hz) b ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 19.3 ppm; IR (ATR) 3277, 1679, 1239, 1162, 1018 cm -1. HRMS (TOF-ESI) calcd for C 9 H 20 NO 5 PNa [M + Na] , found a Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). b Diastereotopic Et group (OCH 2 CH 3 ). c Diastereotopic Et group (OCH 2 CH 3 ). Diethyl 1-(N-acetylamino)-1-triphenylphosphoniummethylphosphonate tetrafluoroborate (7a). Pale yellow resin. 1 H NMR (400 MHz, CDCl 3 ) δ 8.08 (br d, J = 9.2 Hz, 1H), (m, 15H), 6.41 (ddd, J 1 = 9.6, J 2 = 16.0, J 3 = 21.6 Hz, 1H), (m, 4H) a, 1.91 (s, 3H), 1.31 (t, J = 7.0 Hz, 3H) b, 1.15 (t, J = 7.0 Hz, 3H) b, ppm; 13 C NMR (100 MHz, CDCl 3 ) δ (d, J = 2.3 Hz), (d, J = 3.1 Hz), (d, J = 10.5 Hz), (d, J = 13.0 Hz), (d, J = 85.1 Hz), 65.0 (d, J = 7.8 Hz) c and 64.9 (d, J = 6.7 Hz) c, 44.9 (dd, J 1 = 49.3, J 2 = Hz), 21.9, 16.2 (d, J = 5.3 Hz) b and 15.9 (d, J = 4.6 Hz) b ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 28.5 (d, J = 34.5 Hz), 11.7 (J = 33.2 Hz) ppm; IR (ATR) 3359, 1667, 1270, 1015 cm -1. HRMS (TOF-ESI) calcd for C 25 H 30 NO 4 P 2 [M] , found a Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). b Diastereotopic Et group (OCH 2 CH 3 ). c Diastereotopic Et group (OCH 2 CH 3 ). Diethyl 1-(N-acetylamino)-1-triphenylphosphoniumethylphosphonate tetrafluoroborate (7b). Pale yellow resin. 1 H NMR (400 MHz, CDCl 3 ) δ (br dd, J 1 = 3.6, J 2 = 8.0 Hz, 1H), (m, 15H), (m, 4H) a, 1.93 (dd, J 1 = 15.8, J 2 = 19.0 Hz, 3H), 1.72 (s, 3H), (m, 6H) b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ 171.2, (d, J = 10.0 Hz), (d, J = 3.0 Hz), (d, J = 13.0 Hz), (d, J = 84.2 Hz), 65.2 (d, J = 7.6 Hz) c and 65.1 (d, J = 8.3 Hz) c, 58.2 (dd, J 1 = 42.4, J 2 = Hz), 21.6, 16.4, 16.4 (d, J = 5.3 Hz) d and 16.2 (d, J = 5.3 Hz) d ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 37.0 (d, J = 48.1 Hz), 16.5 (d, J = 48.1 Hz) ppm; IR (ATR) 3325, 1679, 1248, 1163, 1017 cm -1. HRMS (TOF-ESI) calcd for C 26 H 32 NO 4 P 2 [M] , found a Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). b Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). c Diastereotopic Et group (OCH 2 CH 3 ). d Diastereotopic Et group (OCH 2 CH 3 ). Tetraethyl 1-(N-acetylamino)methylidenebisphosphonate (8a). White crystals, mp 25 C. 1 H NMR (400 MHz, CDCl 3 ) δ 6.30 (br d, J = 10.4 Hz, 1H), 5.04 (ddd, J 1 = 10.4, J 2 = 21.6, J 3 = 21.9 Hz, 1H), (m, 8H) a, 2.08 (d, J = 0.9 Hz, 3H), 1.34 (t, J = 7.0 Hz, 6H) b, 1.33 (t, J = 7.0 Hz, 6H) b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ (t, J = 4.2 Hz), (d, J = 3.1 Hz) c and (d, J = 3.0 Hz) c and (d, J = 3.8 Hz) c and (d, J = 3.0 Hz) c, 43.6 (t, J = Hz), 22.8, (d, J = 3.0 Hz) d and (d, J = 3.1 Hz) d and S2
3 (d, J = 3.0 Hz) d, (d, J = 3.0 Hz) d ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 17.0 ppm; IR (ATR) 3252, 1663, 1242, 1014 cm -1. HRMS (TOF-ESI) calcd for C 11 H 25 NO 7 P 2 Na [M + Na] , found a Overlapping signals of four diastereotopic Et groups (OCH 2 CH 3 ). b Two diastereotopic Et groups (OCH 2 CH 3 ). c Diastereotopic Et group (OCH 2 CH 3 ). d Diastereotopic Et group (OCH 2 CH 3 ). Tetraethyl 1-(N-acetylamino)ethylidenebisphosphonate (8b). Colourless oil. 1 H NMR (400 MHz, CDCl 3 ) δ 6.02 (br t, J = 5.0 Hz, 1H), (m, 8H) a, 2.01 (s, 3H), 1.98 (t, J = 16.8 Hz, 3H), 1.36 (t, J = 7.2 Hz, 12H) ppm; 13 C NMR (100 MHz, CDCl 3 ) δ (t, J = 5.3 Hz), (d, J = 3.1 Hz) b and (d, J = 3.7 Hz) b, 56.8 (t, J = Hz), 24.6, 17.0 (t, J = 4.5 Hz), (d, J = 2.3 Hz) c and (d, J = 3.0 Hz) c and (d, J = 2.3 Hz) c and (d, J = 3.0 Hz) c ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 20.5 ppm; IR (ATR) 3273, 1690, 1238, 1019 cm -1. HRMS (TOF-ESI) calcd for C 12 H 27 NO 7 P 2 Na [M + Na] , found a Overlapping signals of four diastereotopic Et groups (OCH 2 CH 3 ). b Diastereotopic Et groups (OCH 2 CH 3 ). c Diastereotopic Et group (OCH 2 CH 3 ). Diethyl 1-(N-acetylamino)-1-[ethoxy(methylphosphinyl)]methylphosphonate (8c) a. Colourless oil. 1 H NMR (600 MHz, CDCl 3 ) δ 6.84 (br s, 1H) b, 6.50 (br d, J = 9.6 Hz, 1H) b, 4.97 (ddd, J 1 = 10.2, J 2 = 16.2, J 3 = 26.4 Hz, 1H) b, 4.95 (ddd, J 1 = 10.2, J 2 = 14.4, J 3 = 24.6 Hz, 1H) b, (m, 6H) c, 2.10 (s, 3H) b and 2.09 (s, 3H) b, 1.71 (d, J = 14.4 Hz, 3H) b, 1.59 (d, J = 14.4 Hz, 3H) b, (m, 9H) d ppm; 13 C NMR (100 MHz, CDCl 3 ) δ (dd, J 1 = 3.0, J 2 = 4.5 Hz) b, (dd, J 1 = 3.1, J 2 = 3.8 Hz) b, (63.71, 63.65, 63.62, 63.55, 63.48, 62.15, 62.08, 61.95, 61.88) e, 46.5 (dd, J 1 = 86.1, J 2 = Hz) b, 46.0 (dd, J 1 = 85.2, J 2 = Hz) b, b, b, (16.63, 16.58, 16.49, 16.43, 16.38, 16.37, 16.32, 16.28, 16.26, 16.22) f, 14.6 (d, J = 97.1 Hz) b, 13.6 (dd, J 1 = 3.1, J 2 = Hz) b ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 46.1 (d, J = 20.9 Hz), 45.2 (d, J = 30.8 Hz), 17.5 (d, J = 21.1 Hz), 17.4 (d, J = 30.8 Hz) ppm; IR (ATR) 3200, 1672, 1215, 1023 cm -1. HRMS (TOF-ESI) calcd for C 10 H 23 NO 6 P 2 Na [M + Na] , found a The mixture of two diastereomers in the ratio of 1:1. b Separate signals of one diastereomer. c Overlapping signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). d Overlapping signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). e Partly overlapping doublets of two diastereotopic and one heterotopic Et groups of two diastereomers (OCH 2 CH 3 ). f Partly overlapping signals of two diastereotopic and one heterotopic Et groups of two diastereomers (OCH 2 CH 3 ). Diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]methylphosphonate (8d) a. Colourless oil. 1 H NMR (600 MHz, CDCl 3 ) δ (m, 2H) b, (m, 1H) b, (m, 2H) b, 6.32 (br d, J = 9.6 Hz, 1H) c,d, 6.13 (br d, J = 10.2 Hz, 1H) c,e, (ddd, J 1 = 10.2, J 2 = 18.0, J 3 = 36.6 Hz, 1H) c,e, (ddd, J 1 = 5.7, J 2 = 10.8, J 3 = 17.4 Hz, 1H) c,d, (m, 6H) b,f, 2.02 (s, 3H) c,d and 1.81 (s, 3H) c,e, (m, 6H) b,g, 1.24 (t, J = 7.1 Hz, 3H) c,d,h, 1.22 (t, J = 7.0 Hz, 3H) c,e,h ppm; 13 C NMR (100 MHz, CDCl 3 ) δ (dd, J 1 = 3.8, J 2 = 3.8 Hz) c,d, (dd, J 1 = 3.8, J 2 = 3.8 Hz) c,e, [133.0 (d, J = 3.0 Hz), (d, J = 9.8 Hz), (dd, J 1 = 1.5, J 2 = Hz), (d, J = 16.0 Hz)] d,i and [132.9 (d, J = 2.3 Hz), (d, J = 9.8 Hz), (dd, J 1 = 4.9, J 2 = Hz), (d, J = 11.4 Hz)] e,i, (63.4, 63.35, 63.3, 63.2, 62.6, 62.5, 62.1, 62.0) j, 46.9 (dd, J 1 = 95.6, J 2 = Hz) c,d, 46.0 (dd, J 1 = 100.9, J 2 = Hz) c,e, c,d, c,e, (16.54, 16.48, 16.46, 16.40, 16.35, 16.30, 16.25, 16.21, 16.15) k ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 34.8 (d, J = 16.0 Hz), 33.6 (d, J = 28.4 Hz), 17.4 (d, J = 16.0 Hz), 16.9 (d, J = 29.5 Hz) ppm; IR (ATR) 3447, 2984, 1667, 1225, 1022 cm -1. HRMS (TOF-ESI) calcd for C 15 H 25 NO 6 P 2 Na [M + Na] , found a The mixture of two diastereomers in the ratio of 1:1.4. b Overlapping signals of two diastereomers. c Separate signal of one diasteromer. d Minor S3
4 diastereomer. e Major diastereomer. f Overlapping signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). g Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). h Heterotopic Et group (OCH 2 CH 3 ). i Separate signal of PhP=O group of one diastereomer. j Partly overlapping doublets of two diastereotopic and one heterotopic Et groups of two diastereomers (OCH 2 CH 3 ). k Partly overlapping signals of two diastereotopic and one heterotopic Et groups of two diastereomers (OCH 2 CH 3 ). Diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]ethylphosphonate (8e). Major diastereomer. Colourless oil. 1 H NMR (400 MHz, CDCl 3 ) δ (m, 2H), (m, 3H), 6.19 (br s, 1H), (m, 6H) a, 1.91 (s, 3H), 1.89 (dd, J 1 = 16.4, J 2 = 16.8 Hz, 3H), (m, 9H) b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ (dd, J 1 = 4.5, J 2 = 5.3 Hz), (d, J = 9.1 Hz), (d, J = 3.1 Hz), (d, J = 12.1 Hz), (dd, J 1 = 3.4, J 2 = Hz), [63.7 (d, J = 7.6 Hz), 63.5 (d, J = 7.6 Hz) and 62.7 (d, J = 6.8 Hz)] c, 58.5 (dd, J 1 = 97.6, J 2 = Hz), 24.6, (17.15, 17.13, 17.10, 17.09) d, (d, J = 6.0 Hz) e and (d, J = 5.3 Hz) e ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 39.4 (d, J = 16.0 Hz), 20.8 (d, J = 15.9 Hz) ppm; IR (ATR) 3277, 1558, 1184, 1023 cm -1. HRMS (TOF-ESI) f calcd for C 16 H 27 NO 6 P 2 Na [M + Na] , found a Overlapping signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). b Overlapping signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). c Signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). d Overlapping signals of the Me group at C α position and heterotopic Et group (OCH 2 CH 3 ). e Diastereotopic Et group (OCH 2 CH 3 ). f MS spectrum was performed for the mixture of diastereomers. Diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]ethylphosphonate (8e). Minor diastereomer. Colourless oil. 1 H NMR (400 MHz, CDCl 3 ) δ (m, 2H), (m, 3H), 6.36 (br s, 1H), (m, 6H) a, 2.02 (s, 3H), 1.93 (dd, J 1 = 16.8, J 2 = 17.2 Hz, 3H), [1.37 (t, J = 7.0 Hz, 3H), 1.30 (t, J = 7.0 Hz, 3H) and 1.23 (t, J = 7.0 Hz, 3H)] b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ 170.0, (d, J = 9.1 Hz), (d, J = 2.2 Hz), (d, J = 12.9 Hz), (d, J = Hz), [63.8 (d, J = 7.5 Hz), 63.5 (d, J = 7.6 Hz) and 62.6 (d, J = 6.8 Hz)] c, 58.7 (dd, J 1 = 94.1, J 2 = Hz), 24.8, 16.9 (d, J = 3.2 Hz), [16.49 (d, J = 6.0 Hz), (d, J = 6.1 Hz) and (d, J = 6.1 Hz)] b ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 38.2 (d, J = 27.5 Hz), 20.1 (d, J = 27.5 Hz) ppm; IR (ATR) 3268, 1689, 1227, 1019 cm -1. a Overlapping signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). b Signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). c Signals of two diastereotopic and one heterotopic Et groups (OCH 2 CH 3 ). Diethyl 1-(N-acetylamino)-1-(diphenylphosphinoyl)methylphosphonate (8f). White resin. 1 H NMR (600 MHz, CDCl 3 ) δ (m, 2H), (m, 2H), (m, 6H), 6.71 (br d, J = 9.6 Hz, 1H), 5.62 (ddd, J 1 = 9.6, J 2 = 10.2, J 3 = 21.6 Hz, 1H), (m, 4H) a, 1.85 (s, 3H), 1.23 (dt, J 1 = 0.6, J 2 = 7.5 Hz, 3H) b and 1.12 (t, J = 7.2 Hz, 3H) b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ (dd, J 1 = 3.1, J 2 = 3.8 Hz), [132.2 (d, J = 3.0 Hz), (d, J = 3.0 Hz), (d, J = 9.8 Hz), (d, J = 9.9 Hz), (dd, J 1 = 7.6, J 2 = Hz), (d, J = Hz), (d, J = 12.2 Hz) and (d, J = 12.2 Hz)] c, 63.3 (d, J = 6.8 Hz) d, 62.9 (d, J = 6.1 Hz) d, 46.4 (dd, J 1 = 66.4, J 2 = Hz), 22.4, 16.2 (d, J = 6.0 Hz) b and 15.9 (d, J = 6.1 Hz) b ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 30.6 (d, J = 16.0 Hz), 17.3 (d, J = 16.0 Hz) ppm; IR (ATR) 3229, 2988, 1668, 1258, 1187, 1019 cm -1. HRMS (TOF-ESI) calcd for C 19 H 25 NO 5 P 2 Na [M + Na] , found a Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). b Diastereotopic Et group (OCH 2 CH 3 ). c Signals of two diastereotopic Ph groups. d Diastereotopic Et group (OCH 2 CH 3 ). S4
5 Diethyl 1-(N-acetylamino)-1-(diphenylphosphinoyl)ethylphosphonate (8g). Colourless oil. 1 H NMR (400 MHz, CDCl 3 ) δ (m, 4H) and (m, 6H), 6.80 (br s, 1H), (m, 4H) a, 1.98 (dd, J 1 = 16.4, J 2 = 16.8 Hz, 3H), 1.96 (s, 3H), 1.21 (t, J = 7.0 Hz, 3H) b and 1.18 (t, J = 7.0 Hz, 3H) b ppm; 13 C NMR (100 MHz, CDCl 3 ) δ 170.0, [132.9 (d, J = 9.2 Hz), (d, J = 9.2 Hz), (d, J = 3.0 Hz), (d, J = 1.5 Hz), (d, J = 97.9 Hz), (d, J = 81.2 Hz), (d, J = 12.3 Hz), (d, J = 12.2 Hz)] c, 63.5 (d, J = 6.8 Hz), 59.4 (dd, J 1 = 63.3, J 2 = Hz), 24.7, 18.2 (d, J = 1.5 Hz), 16.3 (d, J = 5.5 Hz) b and 16.2 (d, J = 6.0 Hz) b ppm; 31 P NMR (162 MHz, CDCl 3 ) δ 35.3 (d, J = 18.5 Hz), 20.8 (d, J = 18.5 Hz) ppm; IR (ATR) 3429, 1690, 1237, 1181, 1020 cm -1. HRMS (TOF-ESI) calcd for C 20 H 27 NO 5 P 2 Na [M + Na] , found a Overlapping signals of two diastereotopic Et groups (OCH 2 CH 3 ). b Diastereotopic Et group (OCH 2 CH 3 ). c Signals of two diastereotopic Ph groups. S5
6 1 H NMR spectrum of tetraethyl 1-(N-acetylamino)ethylidenebisphosphonate (8b); 400 MHz/CDCl 3 /TMS; δ (ppm). S6
7 13 C NMR spectrum of tetraethyl 1-(N-acetylamino)ethylidenebisphosphonate (8b); 100 MHz/CDCl 3 /TMS; δ (ppm). S7
8 31 P NMR spectrum of tetraethyl 1-(N-acetylamino)ethylidenebisphosphonate (8b); 162 MHz/CDCl 3 /H 3 PO 4 (80%); δ (ppm). S8
9 1 H NMR spectrum of the mixture of diastereomers of diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]methylphosphonate (8d); 600 MHz/CDCl 3 /TMS; δ (ppm). S9
10 13 C NMR spectrum of the mixture of diastereomers of diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]methylphosphonate (8d); 100 MHz/CDCl 3 /TMS; δ (ppm). S10
11 31 P NMR spectrum of the mixture of diastereomers of diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]methylphosphonate (8d); 162 MHz/CDCl 3 ; δ (ppm). S11
12 1 H NMR spectrum of one of the diastereomers of diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]ethylphosphonate (8e); 400 MHz/CDCl 3 /TMS; δ (ppm). S12
13 13 C NMR spectrum of one of the diastereomers of diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]ethylphosphonate (8e); 100 MHz/CDCl 3 /TMS; δ (ppm). S13
14 31 P NMR spectrum of one of the diastereomers of diethyl 1-(N-acetylamino)-1-[ethoxy(phenylphosphinyl)]ethylphosphonate (8e); 162 MHz/CDCl 3 ; δ (ppm). S14
15 1 H NMR spectrum of diethyl 1-(N-acetylamino)-1-(diphenylphosphinoyl)methylphosphonate (8f); 600 MHz/CDCl 3 /TMS; δ (ppm). S15
16 13 C NMR spectrum of diethyl 1-(N-acetylamino)-1-(diphenylphosphinoyl)methylphosphonate (8f); 100 MHz/CDCl 3 /TMS; δ (ppm). S16
17 31 P NMR spectrum of diethyl 1-(N-acetylamino)-1-(diphenylphosphinoyl)methylphosphonate (8f); 162 MHz/CDCl 3 ; δ (ppm). S17
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