翻訳と辞書 Words near each other ・ Cyclone Arthur (2007) ・ Cyclone AX2000 ・ Cyclone Bebe ・ Cyclone Bejisa ・ Cyclone Bella ・ Cyclone Beni ・ Cyclone Berit ・ Cyclone Bijli ・ Cyclone Bingiza ・ Cyclodendron ・ Cycloderma ・ Cyclodes (moth) ・ Cyclodes omma ・ Cyclodextrin ・ Cyclodextrin glycosyltransferase ・ Cyclodiphosphazane ・ Cyclodisparity ・ Cyclodium ・ Cyclodium meniscioides ・ Cyclodius ・ Cyclododecahexaene ・ Cyclododecane ・ Cyclododecatriene ・ Cyclodomorphus ・ Cyclodomus ・ Cyclodorippoida ・ Cycloes ・ Cycloeucalenol cycloisomerase ・ Cyclofenil ・ Cyclofosfamide/dexamethasone Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cyclodiphosphazane ： ウィキペディア英語版 Cyclodiphosphazane A cyclodiphosphazane is a type of chemical compound and a saturated four membered P2N2 ring and one of the major classes of cyclic phosphazene compounds. Bis(chloro)cyclodiphosphazanes, cis-()2 are important starting compounds for synthesizing a variety of cyclodiphosphazane derivatives by nucleophilic substitution reactions; are prepared by reaction of phosphorus trichloride (PCl3) with a primary amine (RNH2) or amine hydrochlorides (RNH3Cl). Organic substituents on nitrogen play an important role in formation of cyclicphosphazane compounds. The cyclic tetramers (I) and trimer (II) are formed with organic substituents such as methyl and ethyl on nitrogen, whereas formation of cyclic dimers cis-()2 have been observed exclusively with more sterically demanding primary amines such as ''t''-BuNH2 and PhNH2. ==Coordination Chemistry== Cyclodiphosphazanes are excellent ligand systems for metallosupramolecular chemistry. The cis-oriented lone pair on phosphorus in cyclodiphosphazane are projected away from each other, so chelation to metal center is not possible. This bridging coordination of cyclodiphosphazane allows formation of metallomacrocycles containing four rhodium and gold centers and metallopolymers CuX, AgX. Chiral cylcodiphosphazanes have found use as ligands in asymmetric catalysis. Gade et al. employed them in enantioselective transition-metal mediated catalysis(1), while Goldfuss et al. employed di-amino substituted chiral variants in hydrogen bonding catalyis(2). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cyclodiphosphazane」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.