The rotationally resolved electronic spectra of several conformers of 1-hexoxy and 1-heptoxy
作者:Lily Zu、Jinjun Liu、Sandhya Gopalakrishnan、Terry A Miller
DOI:10.1139/v04-056
日期:2004.6.1
Laser-induced fluorescence excitation spectra of five vibronic bands of 1-hexoxy and three bands of 1-heptoxy have been recorded in a jet-cooled environment. Experimental values of rotational constants for both the and states and components of the spin-rotational tensor for the state were obtained by an analysis of the partially resolvedrotationalstructure of the vibronic bands. Comparing these experimental
An acetal is produced at a high yield and a high selectivity by contacting an olefin and an alcohol with each other in the presence of (a) a nitrite, (b) a platinum group metal or the salts thereof and (c) a halide at a high reaction rate without requirement of any troublesome operations for the separation, recovery and regeneration of the catalyst.
A metal nitrite or organic nitrite is admixed with a monovinyl-substituted aromatic hydrocarbon/conjugated diene copolymer to inhibit gel and fisheye formation in the copolymer.
Process for preparing haloketo acid derivatives [I]:
wherein R is H or C₁₋₆ alkyl, and X is a chlorine or bromine, which comprises reacting β-oxo-acid ester [II]:
wherein R¹ is C₁₋₆ alkyl, R² is C₁₋₅ alkyl or OR³ (R³ is C₁₋₆ alkyl), and X is the same as above, with nitrosating agent [IV]:
ONOR⁴ [IV]
wherein R⁴ is H, alkyl, halogen or SO₃H to give 7-halo-2-hydroxyiminoheptanoic acid ester [III]:
wherein R¹ and X are the same as above, followed by reacting the product with aldehyde or ketone; and intermediates therefor, and process for preparing said intermediates. Said haloketo acid derivatives are useful as intermediate for synthesis of cilastatin, which is useful as medicament, especially as dehydropeptidase inhibitor.