The author of 《Phenylmalonic and nitrophenylmalonic acids and esters》 were Basterfield, S.; Hamilton, L. A.. And the article was published in Trans. Roy. Soc. Can. III in 1933. Electric Literature of C11H11NO6 The author mentioned the following in the article:
Shaking PhCH(CO2Me)2 (I) in Et2O with dilute aqueous NaOH for 1 hr. at room temperature gives an aqueous alk. solution which with acid gives 80-90% of PhCH(CO2H)2 (II). The method of Wislicenus (Ber. 27, 1091(1894)) gives only a 25% yield. I with concentrated HNO3 and concentrated H2SO4 gives Me p-nitrophenylmalonate (III), m. 95°. III on hydrolysis by the above method gives only p-O2NC6H4CH2CO2H. II with concentrated HNO3 and concentrated H2SO4 gives o-nitrophenylmalonic acid, m. 133° (decomposition). Contrary to expectations p-O2NC6H4CH2CO2Me does not condense with (OC2Me)2 (cf. Rising and Stieglitz, C. A. 12, 908). p-EtOOCNHC6H4CH2CO2Me condenses with (CO2Me)2 to give Me p-carbethoxyaminophenylmalonate, viscous oil, b5 110°. Reduction of 2,4(O2N)2C6H3CH(CO2Me)2 (IV) with (NH4)2S gives 2 isomeric Me nitroaminophenylmalonates, m. 131° and 190°. IV on hydrolysis does not give the expected acid. The experimental process involved the reaction of Dimethyl 2-(4-nitrophenyl)malonate(cas: 4033-88-9Electric Literature of C11H11NO6)
Dimethyl 2-(4-nitrophenyl)malonate(cas: 4033-88-9) belongs to esters.Electric Literature of C11H11NO6 They are important in biology, being one of the main classes of lipids and comprising the bulk of animal fats and vegetable oils.Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics