Nucleophilic addition to coordinated allyl ligands. Heteroatom nucleophiles with cationic molybdenum complexes
作者:W.E. Vanarsdale、R.E.K. Winter、J.K. Kochi
DOI:10.1016/0022-328x(85)80337-5
日期:1985.11
sulfide was also converted stereospecifically to a single isomeric sulfoxide with m-chloroperbenzoic acid. Such a chiral oxidation of a sulfide to a sulfoxide is compared with the rather unselective sulfoxidation of the free phenyl 3-cyclooctenyl sulfide by the same reagent. The stereospecificity is analyzed in terms of steric features inherent of allyl sulfides coordinated to an optically active metal center
在加入异阴离子(甲醇,氢化物,alkylnitronate和硫醇盐)进行一系列的πallylmolybdenum至η相关阳离子的5 -C 5 H ^ 5的Mo(CO)(NO)(η 3 -烯丙基)+了检查。在每种情况下,都分离了在配位烯丙基基团末端的亲核攻击产生的加合物。发现将硫酚盐添加到环辛烯基类似物中,以高产率仅产生一种立体异构体。协调苯基3-环辛烯基硫化物也立体有择转化成具有单一的异构体亚砜米-氯过苯甲酸。将这种硫化物手性氧化为亚砜与通过相同试剂对游离苯基3-环辛烯基硫化物的非选择性硫氧化进行了比较。根据与光学活性金属中心配位的烯丙基硫化物固有的空间特征来分析立体特异性。
Formation of [M − H]+ ions in electron impact mass spectra of nitrosocarbonyl compounds α- and γ-nitrosocarbonyl compounds
作者:Leszek Konopski
DOI:10.1002/oms.1210250405
日期:1990.4
AbstractThe presence of the [M + H]+ ions and the absence of the monomer molecular ions M+· in the mass spectra of some tertiary α‐ and γ‐nitrosocarbonyl compounds is reported. This effect is caused by the rearrangement of the mobile hydrogen in the α‐carbonyl position in the fragmentation pattern of the dimer molecular ions 2M+·.
A convenient synthesis of deuterium labeled tertiary aliphatic nitro ketones and nitriles – starting materials for preparation of deuterated cyclic nitrones, isomeric hydroxylamines, and corresponding C-nitroso compounds
作者:Karol Grela、Leszek Konopski
DOI:10.1016/j.tet.2010.03.022
日期:2010.5
selected positions had been synthesized. The deuterated nitro compounds served as a startingmaterial for the corresponding deuterium labeled nitrones or hydroxylamines (reducing with aluminum amalgam). Further oxidation of the last two groups of compounds with sodium periodate or m-CPBA afforded the relevant deuterated tertiary C-nitroso compounds.
<i>ortho</i>-Naphthoquinone-Catalyzed Aerobic Hydrodeamination of Aryl Amines via <i>in Situ</i> De-diazotization of Aryl Diazonium Species
作者:Tengda Si、Hana Cho、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.2c03523
日期:2022.11.25
diazotization of arylamines was developed using ortho-naphthoquinone catalyst under aerobic conditions, where the 2-nitropropane served as a source of nitrosonium ion. The catalytic generation of diazonium species from arylamines was further explored in the hydrode-diazotization to give the corresponding products. The mechanistic studies indicated the involvement of arylradical species that readily