Flash vacuum pyrolysis of 2-diazo-8-oxabicyclo[3.2.1]oct-6-en-3-ones. A new method for the preparation of propadienones
When diazoketones 3a and 3b are pyrolysed at 430°C and 10-4 torr, they undergo loss of N2 followed by Wolff rearrangement and loss of furan by retro Diels-Alder reaction to yield the desired propadienones 1(a,b). If argon is added to the pyrolysate mixture, these reactive compounds can be trapped under matrix isolation conditions at 22 K and observed by FTIR. Upon photolysis, 1b yields carbon monoxide and 2-butyne.
Brahms,Dailey
p. 1381 - 1384
(2007/10/02)
LOW TEMPERATURE KETENE PREPARATIONS USING NITROSYLTETRACARBONYLCHROMIUM (-II) ANION
Methylene and cyclopropyl ketenes can be generated at -100 deg C by the dehalogenation of α-bromoacylhalides using nitrosyltetracarbonylchromium (-II) anion.This facilitates the trapping of these ketenes with more stable ketenes to give mixed ketene dimers.
Masters, A. P.,Sorensen, T. S.
p. 5869 - 5872
(2007/10/02)
NEW SILICON-CONTAINING ALDOKETENES
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Zaitseva, G. S.,Livantsova, L. I.,Savost'yanova, I. A.,Baukov, Yu. I.,Lutsenko, I. F.
p. 1432 - 1433
(2007/10/02)
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