67674-33-3Relevant academic research and scientific papers
Coupling compounds and hair dyeing compositions containing them
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Page/Page column 9, (2008/06/13)
The present invention refers to compounds of the formula (I) wherein R1 is (C1-C4)-alkyl, (C1-C4)-alkyl which is substituted by hydroxy, (C1-C4)-alkoxy, hydroxy-(C1-C4)-alkoxy, CN, -COOR5, -CON(R5)2 or -N(R5)2 or is phenyl; R2 is hydrogen, methyl or ethyl; R3 is (C1-C4)-alkylsulfonyl, (C1-C4)-alkylsulfonyl which is substituted by hydroxy, halogen, cyano, (C1-C4)-alkoxy or -N(R5)2 or is -SO2-CH=CH2, -SO2N(R5)2 or -PO(OR5)2; R4 is hydrogen, (C2-C4)-alkyl which is substituted by hydroxy, (C1-C4)-alkoxy or hydroxy-(C1-C4)-alkoxy; each of R5, independently is hydrogen, (C1-C4)-alkyl or hydroxy-(C2-C4)-alkyl; whereas R3 is not -NHSO2CH3 if R2 and R4 are both hydrogen and R1 is methyl, as well as hair dye compostions containing them.
KETONITRONE ESTERS AND THEIR KETALS IN THE ALKYLATION OF SALTS OF NITROPHENOLS AND THE CORRESPONDING MEISENHEIMER COMPLEXES
Drozd, V. N.,Grandberg, N. V. (Tokmakova),Udachin, Yu. M.
, p. 1082 - 1089 (2007/10/02)
A study has been carried out of the formation of ethers in the alkylation of the silver salts of nitrophenols by alkyl halides, and of the corresponding cyclic ketals of the ketonitrone ethers in the alkylation of alkali metal salts of Meisenheimer comple
