Method for producing a 5-bromo-1-pentanal compound or an acetal

Details Method for producing a 5-bromo-1-pentanal compound or an acetal Method for producing a 5-bromo-1-pentanal compound or an acetal

1987-07-28

1988-07-26

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 4563, C07C 4714

Patent

active

047601957

ABSTRACT:
A 5-bromo-1-pentanal compound of the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 respectively represent, independently from each other, a member selected from the group consisting of a hydrogen atom and alkyl radicals having 1 to 7 carbon atoms, or an acetal derivative of said 5-bromo-1-pentanal compound, is produced by subjecting a starting compound selected from the group consisting of 4-pentenal compounds of the formula (II): ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, and acetal derivatives of the above-mentioned compounds, to a free radical addition reaction with hydrogen bromide in a liquid medium at a temperature of 10.degree. C. to 60.degree. C.; in the presence of a free radical initiator or by irradiating ultraviolet rays to the reaction mixture, and by collecting the resultant reaction product from the reaction mixture.

REFERENCES:
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patent: 3940445 (1976-02-01), Reif et al.
Koho et al. "Chemical Abstracts", vol. 101, p. 170707g (1984).
M. Akltar et al., J. Am. Chem. Soc., 87, 1807(1965).
J. F. Le Borgne, J. Organomet. Chem., 122, 123(1976).
W. Oppolzer et al., Helv. Chem. Acta., 60, 1801(1977).
R. Daniel Little et al., J. Org. Chem., 47, 362(1982).
Kuehne et al., J. Org. Chem., 43, 3705(1978).

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