天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List 4-Nitronaphthalene-1,8-dicarboxylic anhydride
34087-02-0

4-Nitronaphthalene-1,8-dicarboxylic anhydride synthesis

1synthesis methods
-

Yield: 74%

Reaction Conditions:

with sodium dichromate in acetic acid at 65 - 100; for 8.5 h;

Steps:

3 2.3 Synthesis of 4-Nitro-1, 8-naphthalic anhydride
5-Nitroacenaphthene (24.87?g, 0.125?mol) was dissolved in 248.75?mL of hot acetic acid, 158.5?g of sodium dichromate (Na2Cr2O7·2H2O) was added for 3?h?at 65-70?°C. This was warmed gradually to 98-100?°C for 30?min and further refluxed for 5?h. The contents were washed out with 0.6?L of hot water, cooled, filtered and the solid was washed with dilute HCl. It was further boiled for 30?min with 200?mL of 5% Na2CO3 solution for 30?min, filtered, the filtrate was acidified and the separated crystals dried at 120?°C for 4?h to obtain 4-nitro-1,8-naphthalic anhydride, which was recrystallised from HNO3 (d?=?1.40?g/mL) to afford colourless needles [12]. Yield?=?74%; Mp: 231-232?°C; FT-IR (KBr, cm-1) 3078, 2914 2849, 1789, 1756, 1624, 1526; 1H NMR (300?MHz, DMSO-d6): δ (ppm) 8.09 (1H, t, J?=?7.8?Hz, 3-H), 8.54 (1H, d, J?=?7.9?Hz, 8-H), 8.61 (1H, s, 2-H), 8.64 (1H, d, J?=?7.5?Hz, 9-H), 8.73 (1H, dd, J?=?8.2, 8.7?Hz, 4-H); 13C NMR (75?MHz, DMSO-d6): δ (ppm) 120.1, 122.6, 124.0, 124.3, 129.8, 130.3, 130.6, 131.1, 133.2, 149.5, 159.4, 160.0; Anal. Calcd for C12H5NO5: C, 59.27; H, 2.07; N, 5.76%; found C, 59.17; H, 2.02; N, 5.75%.

References:

Ameuru, Umar Salami;Yakubu, Mohammed Kabir;Bello, Kasali Ademola;Nkeonye, Peter Obinna;Halimehjani, Azim Ziyaei [Dyes and Pigments,2018,vol. 157,p. 190 - 197]

4-Nitronaphthalene-1,8-dicarboxylic anhydride Related Search: