Russian Journal of Organic Chemistry, Vol. 38, No. 7, 2002, pp. 1064 1065. Translated from Zhurnal Organicheskoi Khimii, Vol. 38, No. 7, 2002,
pp. 1107 1108.
Original Russian Text Copyright
2002 by Seleznev, Zorina, Trifonova, Zorin, Rakhmankulov.
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Oxidative Heterocyclization of 1,4-Butanediol to 4-Butanolide
D. V. Seleznev, L. N. Zorina, V. N. Trifonova, V. V. Zorin, and D. L. Rakhmankulov
Ufa State Petroleum Technical University,
ul. Kosmonavtov 1, Ufa, 450062 Bashkortostan, Russia
Reserch Institute of Small-Scale Chemical Products and Chemicals,
ul. Ul’yanovykh 75, Ufa, 450029 Bashkortostan, Russia
Received December 21, 2001
According to Jenner [1], alkyl hypochlorites can be
bond in I gives alkoxyl radical II and atomic chlorine
converted into esters on exposure to daylight in ben- which abstract hydrogen atom from the most reactive
zene or carbon tetrachloride in an inert atmosphere.
The reaction was shown to involve intermediate
formation of the corresponding aldehydes and then
acid chlorides; the latter undergo esterification by
the action of alcohol formed during the process [2].
In continuation of these studies, we examined homo-
lytic decomposition of monohypochlorite I derived
from 1,4-butanediol. We found that hypochlorite I
is converted into 4-butanolide and 1,4-butanediol on
exposure to daylight at 20 25 C under argon. The
reaction is accompanied by liberation of hydrogen
chloride, and the yield of 4-butanolide is 46 54%.
Presumably, the final product is formed through steps
indicated above. Comparison of our results with those
reported in [3] led us to presume the reaction sequence
shown in Scheme 1. Homolytic cleavage of the O Cl
-position in hypochlorite I. The resulting radical III
decomposes into aldehyde IV and chlorine atom.
Aldehyde IV can also be formed via disproportiona-
tion of the primary radical pair II+Cl generated by
cleavage of the O Cl bond in initial hypochlorite I.
Aldehyde IV reacts with radical species present in the
reaction mixture to give acyl radical V which abstracts
chlorine atom from hypochlorite I, yielding chloride
VI. Heterocyclization of the latter results in formation
of the final product, 4-butanolide (VII).
Initial hypochlorite I was synthesized by reaction
of 1,4-butanediol with an aqueous solution of NaOCl
and a benzene solution of acetic acid at 0 C [3]. When
a benzene extract of hypochlorite I warmed up to
room temperature, its vigorous decomposition started
to give the corresponding products.
Scheme 1.
1070-4280/02/3807-1064$27.00 2002 MAIK Nauka/Interperiodica