Dimethylamin-(15)N;15N-dimethylamine;15N-Dimethylamin;(15)NH(CH3)2;dimethyl-[15N]amine;15>-Dimethylamin;Dimethylamine-15N, 98 atom % 15N;N-methylmethan(15N)amine
Reduction of an Hexamethylphosphoramide Degradation Product: A Diazabutadiene
摘要:
Alkali metal over-reduction of an electron acceptor in the presence of a hydrogen atom donor, In hexamethylphosphoramide (HMPA), results in a radical that is not simply the anion radical of the acceptor. This new species exhibits an enigmatic EPR pattern. Using N-15 and H-2 labeling studies, the "HMPA degradation product" was found to be the anion radical of N,N'-dimethyl-1,4-diazabutadiene. DFT calculations support this assignment and a mechanism for its formation.
Preparations, properties, and vibrational spectra of some (dimethylamino)halogenosilanes
作者:David G. Anderson、Janet Armstrong、Stephen Cradock
DOI:10.1039/dt9870003029
日期:——
The vibrational spectra of the three (amino)monohalogenosilanes show dramitic changes on solidification, but those of the (amino)dichlorosilane are very similar in all three phases. These differences are discussed in the light of the formation of dimers in the crystalline solid of SiH2Cl(NMe2), and the presence of discrete monomers in the crystal of SiHCl2(NMe2). The n.m.r. spectra of the compounds
Structure of the dimethylamine-sulfur dioxide complex
作者:Jung Jin Oh、Kurt W. Hillig、Robert L. Kuczkowski
DOI:10.1021/j100172a022
日期:1991.9
The microwave spectrum of the charge-transfer complex between dimethylamine and sulfur dioxide was studied with a pulsed molecular beam Fourier transform microwave spectrometer. The rotational constants (in MHz) of (CH3)2NH.SO2 are A = 4445.495 (3), B = 2063.031 (1), and C = 1752.470 (1). In addition to the normal isotopic form, the rotational spectra of the (CH3)2NH.34SO2, (CH3)2(15)NH.SO2, (CH3)2ND.SO2, and two (CH3)2NH.SO18O isotopic species were assigned. Stark effect measurements gave electric dipole components of mu-a = 4.025 (1), mu-c = 1.747 (2), and mu-total = 4.388 (1) D. The structure of this complex lacks any symmetry plane. The nitrogen lone pair points toward the S atom, nearly perpendicular to the plane of the sulfur dioxide, and one methyl group staggers the oxygen atoms. The nitrogen-to-sulfur distance of 2.34 (3) angstrom is about 0.08 angstrom longer than in the trimethylamine-SO2 complex which correlates with the relative strength of the complexes. From the dipole moment and the nitrogen nuclear quadrupole coupling constants, an upper limit is estimated for electron transfer from the nitrogen to the sulfur atom of 0.25 electron. Ab initio calculations also conclude that a methyl group staggers the two oxygens of SO2.
Preparation, characterization, and reactions of the first parent acetylene Fischer carbene complexes
作者:Annette Rahm、William D. Wulff、Arnold L. Rheingold
DOI:10.1021/om00027a002
日期:1993.3
The parent acetylenic Fischer carbene complexes of the type 2, (CO)5M=C(NMe2)C=CH, are isolated and characterized as both chromium (2a) and tungsten(2b) derivatives. Their Diels-Alder and Michael addition reactions are described, as well as the deprotonation of their acetylenic hydrogens.
1H, 13C and 199Hg NMR characteristics of new amine-mercuric chloride complexes
作者:Salim S. Al-Showiman
DOI:10.1016/s0020-1693(00)83918-3
日期:1988.1
Stereochemical studies with aminophosphines and related compounds having the 7-phosphanorbornene structure