Double bond

About: Double bond is a(n) research topic. Over the lifetime, 29147 publication(s) have been published within this topic receiving 425077 citation(s).

Introduction to Infrared and Raman Spectroscopy

Abstract: Vibrational and Rotational Spectra. IR Experimental Considerations. Molecular Symmetry. The Vibrational Origin of Group Frequencies. Methyl and Methylene Groups. Triple Bonds and Cumulated Double Bonds. Olefin Groups. Aromatic and Heteroaromatic Rings. Carbonyl Compounds. Ethers, Alcohols, and Phenols. Amines, C=N, and N=O Compounds. Compounds Conking Boron, Silicon, Phosphorus, Sulfur, or Halogen. Major Spectra-Structure Correlations by Spectral Regions. The Theoretical Analysis of Molecular Vibrations.

The Handbook of Infrared and Raman Characteristic Frequencies of Organic Molecules

Abstract: Alkanes. Halocompounds. Alcohols and Phenols. Ethers and Peroxides. Alkenes. Acetylenes. The -C=N and -N=C Groups. Compounds Containing the Carbonyl Group. Compounds Containing -NH2, -NHR, and -NR2 Groups. The Nitro Group. Double Bonds Containing Nitrogen Atoms. Cumulated Double Bonds. Organic Sulfur Compounds. Organosilicon Compounds. Organophosphorous Compounds. Aromatic and Heteroaromatic Rings. Selected Infrared and Raman Spectra. Appendices. Index.

C−H Activation for the Construction of C−B Bonds

Abstract: A number of studies were conducted to demonstrate C-H activation for the construction of C-B bonds. Investigations revealed that the conversion of C-H bonds to C-B bonds was both thermodynamically and kinetically favorable. The reaction at a primary C-H bond of methane or a higher alkene B 2(OR)4 formed an alkylboronate ester R' -B(OR)2 and the accompanying borane H-B(OR2. The ester and the borane were formed on the basis of calculated bond energies for methylboronates and dioaborolanes. The rates of key steps along the reaction pathway for the conversion of a C-H bond in an alkane or arene to the C-B bond in an alkyl or arylboronate ester were favorable. These studies also highlighted the accessible barriers for C-H bond cleavage and B-C bond formation during the borylation of alkanes and arenes.

A new structural model for graphite oxide

Abstract: Solid-state 13 C NMR spectra of graphite oxide (GO) and its derivatives prompt us to propose a new structural model. The spectra of GO treated with KI and the course of the thermal decomposition of GO reveal the presence of epoxide groups, responsible for the oxidating nature of the material. GO is built of aromatic “islands” of variable size which have not been oxidized, and are separated from each other by aliphatic 6-membered rings containing C–OH, epoxide groups and double bonds. The carbon grid is nearly flat; a small degree of warping is caused by the carbons attached to OH groups, which are in a slightly distorted tetrahedral configuration.