7-substituted quinone methides as inhibitors for unsaturated...

Details 7-substituted quinone methides as inhibitors for unsaturated... 7-substituted quinone methides as inhibitors for unsaturated...

C - Chemistry, Metallurgy

07

C

C07C 69/78 (2006.01) C07B 63/04 (2006.01) C07C 7/20 (2006.01) C07C 15/46 (2006.01) C07C 45/51 (2006.01) C07C 49/647 (2006.01) C07C 49/683 (2006.01) C07C 49/747 (2006.01) C07C 49/753 (2006.01) C07C 49/798 (2006.01) C07C 57/26 (2006.01) C07C 59/80 (2006.01) C07C 67/62 (2006.01) C07C 69/007 (2006.01) C07C 69/14 (2006.01) C07C 69/54 (2006.01) C07C 69/738 (2006.01) C07C 205/45 (2006.01) C07C 235/78 (2006.01) C07C 255/31 (2006.01) C07D 295/185 (2006.01) C07F 9/38 (2006.01) C07F 9/40 (2006.01) C09K 15/08 (2006.01)

Patent

CA 2174061

Ethylenically unsaturated monomers are protected from premature polymerization during manufacture and storage by the incorporation therein of an effective stabilizing amount of a 7-substituted quinone methide compound of formula I: (see formula I) wherein R1 and R2 are independently alkyl of 4 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or phenylalkyl of 7 to 15 carbon atoms, and R3 is -CN, -COOH, - COOR4 ,- COR5,- OCOR6,- CONR7R8 or -PO(OR9)2 where R4 is alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenyl or benzyl, R5 is alkyl of 1 to 18 carbon atoms, aryl of 6 to 10 carbon atoms or said aryl substituted by one or two alkyl of 1 to 4 carbon atoms or by hydroxyl, R6 is alkyl of 1 to 18 carbon atoms, aryl of 6 to 10 carbon atoms or said aryl substituted by one or two alkyl of 1 to 4 carbon atoms or by hydroxyl, R7 and R8 are independently hydrogen, alkyl of 1 to 18 carbon atoms or said alkyl substituted by alkylamino of 1 to 4 carbon atoms, by dialkylamino of 2 to 8 carbon atoms or by hydroxyl; benzyl, aryl of 6 to 10 carbon atoms or said aryl substituted by alkyl of 1 to 4 carbon atoms, by alkylamino of 1 to 4 carbon atoms, by dialkylamino of 2 to 8 carbon atoms, by phenylamino or by hydroxyl, or -NR7R8 is morpholino, piperidino or pyrrolidino, and R9 is hydrogen or alkyl of 1 to 18 carbon atoms.

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