Detailed intrinsic sodium occurrence for future research on migration, release, and catalyst effect behavior of is necessary. Complementary characterizations, such as 13C CP/MAS NMR, FT-IR, 23Na XPS, elemental composition analysis, sequential extraction experiments, were employed to elucidate the actual compound form well Zhundong coal's structural features. Thus, a molecular model in coal was ...

The infrared spectra of the long-chain perfluorocarboxylic acid monohydrates differ markedly from those anhydrous dimers. Consequently, structure solid must any known dimer-containing carboxylic crystals. Consideration significant features monohydrates, supplemented by their Raman spectra, and comparison with auxiliary substances have led us to conclude that rather strong neutral carboxyl-hydro...

SYNTHESIS 2004, No. 9, pp 1509–1521xx.xx.2004 Advanced online publication: 26.05.2004 DOI: 10.1055/s-2004-822392; Art ID: C0404SS © Georg Thieme Verlag Stuttgart · New York Abstract: The Michael additions of a number of ketones and aldehydes to alkylidene malonates and nitro olefins were studied. The reactions employ small organic molecules as catalyst under mild reaction conditions and do not ...

Construction and physico-chemical behavior of DNA three way junction (3WJ) functionalized by protein-like residues (imidazole, alcohol and carboxylic acid) at unpaired positions at the core is described. One 5′-C(S)-propargyl-thymidine nucleotide was specifically incorporated on each strand to react through a post synthetic CuACC reaction with either protected imidazolyl-, hydroxylor carboxyl-a...

Graphene oxide (GO), an amorphous insulatormaterial, has consists of a hexagonal ring based carbon network having both sp2-hybridized carbon atoms and sp3-hybridizedcarbons bearing hydroxyl andepoxide functional groups on either side of the sheet, whereas the sheet edges are mostly decorated by carboxyl and carbonyl groups [1-6]. These unique properties hold great promise for potential applicat...

A specific temperature-dependent conformational transition of hen egg-white lysozyme, occurring between 20 degree C and 30 degree C in solution, has been detected by 13-C-nuclear magnetic resonance spectroscopy. Selective changes in the chemical shifts of aromatic residues, together with differences in the chemical shifts, and nuclear Overhauser enhancement in the carbonyl, carboxyl, and alpha-...

(RS)-(±)-2-Methoxy-carbonyl-3-tropinone is an important inter-mediate for the preparation of cocaine and its derivatives. The molecule in the title compound, C(10)H(16)NO(3) (+)·C(4)H(5)O(6) (-), is present as the enol tautomer. The six-membered ring adopts a half boat conformation, and the five-membered ring a slightly distorted envelope conformation. There are intra- and inter-molecular hydro...

In the title compound, C13H13ClO4, the dihedral angle between the chloro-benezene ring and the least-squares plane through the 4-meth-oxy-2-oxobut-3-enoate ethyl ester residue (r.m.s. deviation = 0.0975 Å) is 54.10 (5)°. In the crystal, mol-ecules are connected by meth-oxy-ketone and benzene-carboxyl-ate carbonyl C-H⋯O inter-actions, generating a supra-molecular layer in the ac plane.

In the title salt, C(4)H(14)N(2) (+)·2C(9)H(3)Cl(4)O(4) (-), the cation lies on an inversion center. In the anion, the mean planes of meth-oxy-carbonyl and carboxyl-ate groups form dihedral angles of 64.9 (3) and 58.5 (3)°, respectively, with the benzene ring. In the crystal, inter-molecular N-H⋯O hydrogen bonds connect the components into sheets parallel to (100).