Detail of "1942-45-6"

Reference

Mass spectral behavior of n-alkynes

Mass spectral behavior of n-alkynes. Mercer, Roger S.; Harrison, Alex. G. (Dep. Chem., Univ. Toronto, Toronto, ON M5S 1A1, Can.). Org. Mass Spectrom., 21(10), 717-22 (English) 1986. CODEN: ORMSBG. ISSN: 0030-493X. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The 70 eV-electron impact spectra of the C1-C10 n-alkynes have been detd. as well as the metastable ion spectra of the mol. 1119-65-9 and 1942-45-6 are cas registry numbers of chemicals which are used as reagents here. ions and the [CS2]+ and [N2O]+ charge exchange mass spectra of the C7-C9 n-alkynes. The metastable ion mass spectra provide only a limited opportunity to distinguish between isomers; however, the 70-eV EI mass spectra of isomeric compds. permit a ready distinction between isomers. The [CS2]+ charge exchange mass spectra of isomeric compds. also show substantial differences. The [N2O]+ charge exchange mass spectra do not show the enhancement of b-fission fragments obsd. in field ionization expts., despite representing ions of similar internal energy, and it is concluded that field dissocn. is responsible for the b-fission fragments in the field ionization expts. .

Kinetic and Spectroscopic Studies of the [Palladium(Ar-bian)]-Catalyzed Semi-Hydrogenation of 4-Octyne

Kinetic and Spectroscopic Studies of the [Palladium(Ar-bian)]-Catalyzed Semi-Hydrogenation of 4-Octyne. Kluwer, Alexander M.; Koblenz, Tehila S.; Jonischkeit, Thorsten; Woelk, Klaus; Elsevier, Cornelis J. (Van't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Amsterdam 1018, Neth. 870525-18-1 is the cas registry number. This chemical is also mentioned in this article.). 870525-18-1 which is the cas registry number of some chemical is mentioned. Journal of the American Chemical Society, 127(44), 15470-15480 (English) 2005 American Chemical Society. CODEN: JACSAT. ISSN: 0002-7863. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Section cross-reference(s): 67, 78 The kinetics of the stereoselective semi-hydrogenation of 4-octyne in THF by the highly active catalyst [Pd{(m,m'-(CF3)2C6H3)-bian}(ma)] (2) (bian = bis(imino)acenaphthene; ma = maleic anhydride) has been investigated. The rate law under hydrogen-rich conditions is described by r = k[4-octyne]0×65[Pd][H2], showing first order in palladium and dihydrogen and a broken order in substrate. Parahydrogen studies have shown that a pairwise transfer of hydrogen atoms occurs in the rate-limiting step. In agreement with recent theor. results, the proposed mechanism consists of the consecutive steps: alkyne coordination, heterolytic dihydrogen activation (hydrogenolysis of one Pd-N bond), subsequent hydro-palladation of the alkyne, followed by addn. of N-H to palladium, reductive coupling of vinyl and hydride and, finally, substitution of the product alkene by the alkyne substrate. Under hydrogen-limiting conditions, side reactions occur, i.e., formation of catalytically inactive palladacycles by oxidative alkyne coupling. Furthermore, it has been shown that (Z)-oct-4-ene is the primary reaction product, from which the minor product (E)-oct-4-ene is formed by an H2-assisted, palladium-catalyzed isomerization reaction. ..