97人妻一区二区精品免费,好男人社区www在线官网,办公室娇喘的短裙老师在线视频,亚州精品久久久久久久久

咨詢電話:021-58952328
Allen膦重排反應2018-01-11
?????? 環膦化合物通過烷基化或酰基化得到環膦鹽,接著在堿性條件下重排擴環,得到多一個碳的環氧膦化合物的反應。此反應也被稱為Allen–Millar–Trippett反應。

反應機理

反應實例

9-Methyl-9,10-dihydro-9-phosphaphenanthrene-9-oxide (3).1 The phosphonium salt 2 (R = Me, 0.7 g, 1.5 mmol) in aq acetone containing KOH solution was heated to reflux for 2 h. Extraction of the cold mixture with CHCl3, evaporation of the solvent and silica gel chromatography via elution with EA:EtOH (7:3) afforded 0.24 g, 71% of 3.

【Allen DW, Millar IT, Chem Ind, 1967, 2178】

Hydroxyphosphine oxide (8).6 Benzoyl chloride (10 g, 71.1 mmol) was added to 4 (7.53 g, 40 mmol) and Et3N (20 mL) in Et2O (300 mL). After 3 h stirring under reflux 5 was hydrolyzed with water (150 mL) for 2 h. The precipitates thus formed were removed by filtration and the resulting filtrate dried over MgSO4. Evaporation of the solvent and recrystallization from PhCH3 afforded 10.8 g of 8 (87%).

【Mathey F, Tetrahedron,1973, 29, 707】

相關文獻

1, Allen DW, Millar IT, Chem Ind, 1967, 2178

2, Trippett S, Chem Comm, 1967, 1113

3, Allen DW, Millar IT, J Chem Soc C, 1969, 252

4, Tebby JC, J Chem Soc C, 1971, 1064

5, Mathey F, Tetrahedron, 1972, 28, 4171

6, Mathey F, Tetrahedron, 1973, 29, 707

7, Allen DW, J Chem Soc Perkin 1, 1976, 2050

8, Markl G, Angew Chem Int, 1987, 26, 1134

9, Keglevich Gy, J Org Chem, 1990, 55, 6361

10, Keglevich Gy, Synthesis, 1993, 931

11,R Savignac P, Eur J Org Chem, 2000, 3103

12, Mapp AK, J Am Chem Soc, 2006, 128, 4576

13, Vignolle J, Tet Lett, 2007, 48, 685

編譯自:Organic Syntheses Based On Name Reactions, 3RdEd, A. Hassner, Page 7-8。

?????????????????????????? 化學慧定制合成事業部摘錄

主站蜘蛛池模板: 长春市| 武冈市| 突泉县| 三门县| 库车县| 密山市| 余庆县| 桦川县| 固镇县| 丽水市| 阳东县| 隆化县| 嘉鱼县| 鄢陵县| 白沙| 昌黎县| 南投县| 巴彦淖尔市| 定日县| 云龙县| 高清| 措勤县| 吐鲁番市| 大同县| 邹平县| 封开县| 宁安市| 屏山县| 黑水县| 绥江县| 高要市| 静宁县| 朝阳区| 平乐县| 民县| 秀山| 巴彦县| 喀什市| 兴化市| 磐安县| 奇台县|