51037-04-8Relevant articles and documents
Pd(ii)/Zn co-catalyzed chemo-selective hydrogenation of α-methylene-γ-keto carboxylic acids
Zhang, Xuexin,Gao, Yang,Laishram, Ronibala Devi,Li, Kangkui,Yang, Yong,Zhan, Yong,Luo, Yang,Fan, Baomin
, p. 2174 - 2181 (2019/02/27)
An efficient Pd/Zn co-catalyzed chemo-selective hydrogenation of α-methylene-γ-keto carboxylic acids is described. This methodology offers a divergent synthesis of α-methyl-γ-keto carboxylic acids, α-methylcarboxylic acids, and lactones starting from α-me
Corrosion-inhibiting coating compositions
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, (2008/06/13)
A coating composition comprising a) an organic film-forming binder, and b) a corrosion-inhibiting amount of a substantially water-insoluble mono- or poly-basic salt of:, i) a ketoacid having the formula I: in which m and n, independently, are 0 or an integer from 1 to 10 provided that the sum of m and n is at least 1; A is C1-C15 alkyl, C2-C15 alkenyl, optionally substituted C3-C12 cycloalkyl, C2-C15 aryl interrupted by one or more O-, N- or S-atoms, optionally substituted C6-C10 aryl, optionally substituted C7-C12 aralkyl, optionally substituted C7-C12 aralkenyl, a heterocyclic residue or a ferrocenyl residue; R1, R2, R3 and R4 are the same or different and each is a substituent A, hydrogen, OH, O-C1-C15 alkyl, NH2, NH(C1-C15 alkyl), N(C1-C15 alkyl)2, CO2H, CO2 (C1-C15 alkyl), SO3H, P(O) (OH)2 P(O)(OH)(O-C1C15 alkyl), P(O) (O-C1-C15 alkyl)2, SH, S(C1-C15 alkyl), nitro, cyano, halogen or two of R1, R2 R3 and R4, together with the carbon atoms to which they are attached, form a C3-C12 cycloalkyl ring or C6- or C10 aryl ring, or one of R1, R2, R3 and R4 together with the carbon atom to which it is attached, and with the group A-C(=O)-, forms a ring, or R1 and R2, or R3 and R4 form a carbonyl group or a C=C double bond, provided that A is not optionally substituted C6-C10 aryl when R1, R2, R3 and R4 are simultaneously hydrogen and provided that R1 and R2, or R3 and R4, respectively, are not simultaneously both OH or both NH2; and ii) a base selected from a) a cation of Group Ia, Ib, IIa, IIb, IIIa, IIIb, IVa, IVb, Va, VIa, VIIa or VIIIa of the Periodic Table of Elements;, b) an amine of formula II in which X, Y and Z are the same or different and each is hydrogen, C1-C24 alkyl optionally interrupted by one or more O-atoms, phenyl, C7-C9 phenylalkyl, C7-C9 alkylphenyl, or two or X, Y and Z, together with the N-atom to which they are attached form a 5-, 6- or 7- membered heterocyclic residue which optionally contains a further O-, N- or S- atom, and which is optionally substituted by one or more C1-C4 alkyl, amino, hydroxy, carboxy or C1-C4 carboxy alkyl groups, and the other one of X, Y and Z is hydrogen, provided that X, Y and Z are not simultaneously hydrogen;, c) a guanidine of formula R-N=C(NH2)2 in which R is hydrogen or C1-C15 alkyl; and, d) an amidine of formula R-C(=NH) NH2 in which R is hydrogen or C1-C15 alkyl.
