A New<i>α</i>,<i>α</i>′-Diiodination of Ketones Using Iodine-Cerium(IV) Ammonium Nitrate
作者:C. Akira Horiuchi、Eiji Takahashi
DOI:10.1246/bcsj.67.271
日期:1994.1
The direct iodination of some ketones using iodine-cerium(IV) ammonium nitrate in acetic acid or acetonitrile gave the corresponding α,α′-diiodoketones in good yield. In the case of cyclododecanone (4), 3-pentanone (5), and 5-nonanone (6), cis- (meso-) compounds [2,12-diiodocyclododecanone (12), 2,4-diiodo-3-pentanone (13), and 4,6-diiodo-5-nonanone (14)] were obtained preferentially.
Irradiation of α-iodo ketone in hexane under a nitrogen atmosphere with a high-pressure mercury lamp (λ>300nm) at room temperature afforded the corresponding α,β-unsaturatedketones in good yield. This reaction affords a new, clean and convenient synthetic method for the α,β-unsaturatedketone.
Oxidation of 2-Substituted Cycloalkanones with Cerium(IV) Sulfate Tetrahydrate in Alcohols and Acetic Acid
作者:Liangyou He、C. Akira Horiuchi
DOI:10.1246/bcsj.72.2515
日期:1999.11
The reaction of 2-substituted cycloalkanones with cerium(IV) sulfate tetrahydrate (CS) in alcohols and acetic acid gave the corresponding alkyl esters of oxo acids (80—96%) and oxo acids (78—96%), respectively, by oxidative cleavage of the C(R)–C=O bond. In the case of 2-iodocycloalkanones in methanol, the dimethyl ester was obtained in good yield. A treatment of 5α-cholestan-3-one with CS in methanol
A New α-Iodination of Ketones Using Iodine–Cerium(IV) Ammonium Nitrate
作者:C. Akira Horiuchi、Shinji Kiji
DOI:10.1246/cl.1988.31
日期:1988.1.5
Direct α-iodination of some ketones using iodine–cerium(IV) ammonium nitrate in acetic acid or methanol, gave the corresponding α-iodoketone in high yield. In the case of 2-pentanone, 4-methyl-2-pentanone, 2-hexanone, and 2-heptanone in methanol, the regioselective products were obtained.
A New<b><i>α</i></b>-Iodination of Ketones Using Iodine-Ammonium Cerium(IV) Nitrate in Alcohol or Acetic Acid
作者:C. Akira Horiuchi、Shinji Kiji
DOI:10.1246/bcsj.70.421
日期:1997.2
The direct α-iodination of various ketones using iodine-ammonium cerium(IV) nitrate in acetic acid or alcohol gave the corresponding α-iodo ketones in high yields. The effect of cerium salt on the iodination of ketones, and the iodination of 5α-cholestan-3-one using several methods are also discussed. In the reaction of 3,3,5-trimethylcyclohexanone and unsymmetrical ketones, such as 2-hexanone and