A process for isomerising aromatic compounds containing eight carbon atoms is described in which the catalyst used contains at least one zeolite with structure type EUO and a group VIII element. In FIG. the feed to be isomerised is introduced into reactor R via line This fresh feed is enrich...
百度试题 结果1 题目neutral carbon atoms always have a total of four bonds 相关知识点: 试题来源: 解析 对 反馈 收藏
Lactams having 7 or more carbon atoms in the ring are polymerized by heating them in an inert atmosphere in the presence of 04-30 mole per cent of a Lewis acid selected from BF 3 , SuCl 4 , SiCl 4 , TiCl 4 , SbCl 5 , AlCl 3 , FeCl 3 or CuCl 2 . Lactams specified are ...
Because the carbon atoms are 4-SIDED structures, and has a chain structure and spatial structure, so that organic matter than the inorganic kind of number 30 times per year, also on the rise. 翻译结果5复制译文编辑译文朗读译文返回顶部
The sol-gel synthesis (SGS) illustrated in Fig.5is a process of solidifying a compound which contains a highly reactive component via solgel or solution which is followed by annealing and heat treatment. This process belongs to waste-free methods, and recently, it has been employed not only ...
申请(专利权)人: SCHERING AG, 1000 BERLIN UND 4709 BERGKAMEN, DE 发明人: IRI Nazzaro-Porro 摘要: Dicarboxylic acids with 7 to 13 atoms of carbon or their physiologically acceptable salts in a pharmaceutically acceptable excipient are used for the topical treatment of acne rosacea.收藏...
A +1 B +2 C +3 D +6 3 When considering one molecule of ethene, which row describes both the hybridisation of the atomic orbitals in the carbon atoms and the overall bonding? hybridisation bonding A sp2 4 σ bonds 1 π bond B sp2 5 σ bonds 1 π bond C sp3 4 σ bonds 1 π ...
The reference compound 13 exhibits a U-shaped conformation with the 6-position carbon of the pyridine ring and the nitrogen atom of the carbamate moiety oriented towards each other. The interatomic distance between the two atoms is determined to be 5.2 Å, offering logical connection points for...
Here we demonstrate quantum error correction to protect the nuclear spin of the nitrogen as a quantum memory in a diamond nitrogen-vacancy center with two nuclear spins of the surrounding carbon isotopes under a zero magnetic field. The quantum error correction makes quantum memory resilient against...
carbon atoms. Minor variations in chain length within these preferred limits have little effect on the non-linear optical properties of the compound. It is also generally preferred that the aliphatic chain is unbranched or at most contains only a one or two branches, each containing one or two...