System M L H log [beta] p[K.sub.a] (a) (b) (c) 0 1 1 5.42 (0.00) 5.42 Cyclobutane-1, 0 1 2 8.06 (0.01) 2.64 1-dicarboxylic 1 1 0 7.13 (0.01) acid 1 1 1 8.95 (0.07) 1.82 0 1 1 5.30 (0.00) 5.30
Malonic acid 0 1 2 7.86 (0.01) 2.56 1 1 0 6.84 (0.06) 1 1 1 10.29 (0.08) 3.45 0 1 1 3.83 (0.00) 3.83 Oxalic acid 0 1 2 5.66 (0.01) 1.83 1 1 0 7.16 (0.04) 1 1 1 10.3 (0.05) 3.14 0 1 1 5.21 (0.00) 5.21 Succinic acid 0 1 2 9.26 (0.00) 4.05 1 1 0 4.27 (0.03) 1 1 1 8.45 (0.08) 4.18 0 1 1 5.11 (0.03) 5.11 Adipic acid 0 1 2 9.35 (0.04) 5.24 1 1 0 4.11 (0.02) 1 1 1 0.494 (0.04) 3.62 (a) M, L, and H are the stoichiometric coefficients corresponding to Pd(MME), dibasic acids, and [H.sup.+], respectively.
Especially, dicarboxylic acids such as
malonic acid derivatives could be anchored to the surface of Ti[O.sub.2] more effectively than monocarboxylic acids, and there are few previous papers about dicarboxylic acids as coadsorbents [12].
(2006) found that the ability of different organic acids to mobilise Al followed the order: citric acid>oxalic acid >
malonic acid > malic acid > tartaric acid > salicylic acid>lactic acid>maleic acid.
We used tetrabutylammonium hydroxide (Aldrich),
malonic acid (Fisher), methanol (Fisher), and ammonium bicarbonate (Sigma) for preparation of the mobile-phase solutions, which were filtered through a 0.45-[micro]m membrane before use for LC separation.
The general approach will be as follows: 1) preparation of the diastereotopic intermediates of
malonic acid 2) Using esterase to perform a desymmetrization of the intermediates 3) Analysis of the resulting half ester intermediates 4)Formation of different amino acids: [alpha](Curtius),[beta](Wolff,Curtius),[gamma](Wittig, Curtius) from that half ester.
It unfolds as a complex interplay among bromate ions,
malonic acid, and a catalyst.
We used tetrabutylammonium hydroxide as an ion-pairing reagent and
malonic acid as a buffer for HPLC separation.
The
malonic acid followed the malic acid and it was notified that lowest amount of organic acid was the citric acid (Mordogan and Ergun, 2001).
A large volume of recent literature links serum levels of homocysteine and methyl
malonic acid in cobalamin and folate deficiency to occlusive cardiovascular disease and neurological manifestations (8).