Microbiological hydroxylation. Part XIII. Cyclododecanone and cyclopentadecanone as substrates for steroid-hydroxylating fungi
作者:Michael J. Ashton、A. Sydney Bailey、Ewart R. H. Jones
DOI:10.1039/p19740001665
日期:——
Cyclododecanone and cyclopentadecanone are both hydroxylated in cultures of four steroid-hydroxylatingfungi, but remarkably, neither is affected by Aspergillus ochraceus. Substitution is less selective and formation of only one or two major products is much less the rule than with steroid substrates; di- and poly-hydroxylation apparently proceed very rapidly. Initial attack occurs at the most remote
Geometric Requirements for Hydrogen Abstractability and 1,4-Biradical Reactivity in the Norrish/Yang Type II Reaction: Studies Based on the Solid State Photochemistry and X-ray Crystallography of Medium-Sized Ring and Macrocyclic Diketones
作者:Anna D. Gudmundsdottir、Thillairaj J. Lewis、Leslie H. Randall、John R. Scheffer、Steven J. Rettig、James Trotter、Chung-Hsi Wu
DOI:10.1021/ja953420a
日期:1996.1.1
The Norrish/Yang type IIphotochemistry of ten even-numbered cyclic diketones ranging in ring size from 10-membered to 26-membered has been studied in the crystalline state as well as in solution. In the solidstate, the diketones undergo stereoselective cyclobutanol formation in which the cis or trans ring fusion stereochemistry of the photoproducts is governed by the conformation of the diketone
已在结晶态和溶液中研究了环大小从 10 元到 26 元的十个偶数环二酮的 Norrish/Yang II 型光化学。在固态下,二酮经历立体选择性环丁醇形成,其中光产物的顺式或反式环融合立体化学由晶体中存在的二酮的构象控制,如通过 X 射线晶体学确定的。反应性 γ-氢原子被识别,与它们的抽象相关的距离和角度参数来自晶体学数据。大多数情况下,提取是通过船状而不是椅子状的六原子几何结构发生的,并且发现 16 种反应性 γ-氢的 CO…H 提取距离 d 的平均值为 2.74 ± 0.04 A;
The fate of transannularlyl-disposed diazo and keto functions in cyclododecanes
作者:L.A Paquette、M.Lee Wise
DOI:10.1016/s0040-4020(01)98702-2
日期:1968.1
The reaction of cyclododecane-1,6- and 1,7-diones with base has resulted in the rapid formation of transannularaldolcondensation products. In contrast, sodium ethoxide-catalyzed decomposition of N-nitroso-N-(6-oxocyclododecyl)acetamide and its 7-oxo counterpart in ethanol solution was found to give rise exclusively to unsaturated cyclododecenones. An analysis of these results in terms of the conformational
作者:Gunther S. Fonken、Milton E. Herr、Herbert C. Murray、Lester M. Reineke
DOI:10.1021/jo01272a034
日期:1968.8
Diastereomeric monocyclic diallenes. Synthesis and properties of the diastereomeric 3,4,9,10-cyclododecatetraene-1,7-diones and 3,4,10,11-cyclotetradecatetraene-1,8-diones