Process for the selective preparation of parabromophenol and its

Details Process for the selective preparation of parabromophenol and its Process for the selective preparation of parabromophenol and its

1983-10-25

1985-05-14

Lone, Werren B.

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

Organic compounds

Oxygen containing

568774, C07C 3927

Patent

active

045173885

ABSTRACT:
This invention is a process for the preparation of para-bromo-phenole derivatives of the formula I ##STR1## wherein R.sub.1, R.sub.2 R.sub.3, R.sub.4 and R.sub.5 each independently represents hydrogen or lower alkyl radical of 1 to 6 carbon atoms, characterized in that a phenol derivative of formula II ##STR2## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are as defined above, is reacted in the presence of a solvent with a compound of the formula ##STR3## or with bromine and a compound of the formula IV ##STR4## wherein R.sub.6 and R.sub.7 in the formulae III and IV being each independently a lower alkyl radical of 1 to 6 carbon atoms, an aryl radical or they form together with the S-atom to which they are attached, a 4 to 6 member ring.

REFERENCES:
patent: 2805263 (1957-09-01), Kaeding et al.
patent: 3546302 (1970-12-01), Asadorian et al.
patent: 3920757 (1975-11-01), Watson
patent: 4210766 (1980-07-01), Somlo

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