Tertiary phosphine oxides - as insecticides fungicides - flame retardants and corrosion inhibitors

Abstract

Abstract Cpds. (I):- (where R and R' are alkyl or cycloalkyl (up to 12C); R2 is H, 1-4c alkyl 3-8C cycloalkyl, each opt. substd. by OH, alkoxy, acyloxy; R3 is H, 1-5C alkyl, hydroxy-, alkoxy-, or acyloxy-alkyl; R4 is H or 1-4C alkyl; a is 0-4, Z is 1-4C-alkyl; 3-8C cycloalkyl each substd. by at least 1OH, alkoxy, alkylthio, acyloxy, two substituent may be joined to form a ring as Z is OR5 or NR6R7, R5 is 1-4C alkyl, alkanoyl, or carbamoyl and (when a is 1-4) H; R6 is H, 1-4C alkyl, alkanoyl, alkoxy carbonyl; R7 is H or 1-4C alkyl or NR6R7 is a 4-7 membered heterocyclic ring) are prepd. from RR'P(O)H and an olefin R2-CH=C R3-(CHR4)a-Z in the presence of a free radical catalyst or UV light at 50-250 degrees C. Thus Me2P(O)H and allyl alcohol in the presence of azo-bis-isobutyronitrile gave Me2P(O(CH2)3OH.

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