Zhu, Di et al. published their research in Organic Letters in 2008 | CAS: 1190-39-2

malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Formula: C11H20O4

A Highly Stereoselective Organocatalytic Tandem Aminoxylation/Aza-Michael Reaction for the Synthesis of Tetrahydro-1,2-Oxazines was written by Zhu, Di;Lu, Min;Chua, Pei Juan;Tan, Bin;Wang, Fei;Yang, Xinhao;Zhong, Guofu. And the article was included in Organic Letters in 2008.Formula: C11H20O4 This article mentions the following:

A facile stereoselective synthesis of multifunctionalized tetrahydro-1,2-oxazines (THOs) has been achieved by the organocatalyzed asym. tandem 伪-aminoxylation/aza-Michael reaction for the C-O/C-N bond formations in moderate to good yields with excellent diastereo- (>99:1 dr) and enantioselectivities (92% to >99% ee). E.g., reaction of di-Me 2-(5-oxopentylidene)malonate (I) with nitrosobenzene, catalyzed by L-proline, gave 84% tetrahydro-1,2-oxazine II (98% ee). In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Formula: C11H20O4).

malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Formula: C11H20O4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics