Structure of DL-α-amino-n-butyric acid (modification A): a reinvestigation

Abstract

Abstract. C4H9NO2, monoclinic, P2~/a, a = 9.829 (4), b=4.78(2),c=

Synthesis and structural characterization of N-para-ferrocenyl benzoyl amino acid ethyl esters and the X-ray crystal structures of the glycyl and (±)-2-aminobutyric acid derivative Fc-C6H4CONHCH(C2H5)CO2Et

“…The parent amino acid DL DL-a-amino-n-butyric acid has been the subject of crystal structure analyses by several research groups (at different temperatures) over several decades, the most precise of which has been reported with CSD code, DLABUT05 [35]. The search for ÔN(H)-C(Et)(H)CO 2 Õ fragments yielded 27 ÔhitsÕ, most of which are zwitterions with the N atom protonated as NH þ 3 , carboxylate as CO À 2 or as metal complexes, e.g.…”

An exceptional series of phase transitions in hydrophobic amino acids with linear side chains

“…The crystal structures of amino acids with hydrophobic side chains invariably incorporate molecular bilayers, each with a hydrogen-bonded core and two surfaces shaped by the amino acid side chains. A series of unique solid-state phase transitions, involving sliding along the hydrophobic interfaces between adjacent bilayers, have been observed for dlmethionine (Met; Mathieson, 1952;Taniguchi et al, 1980;Alagar et al, 2005;Gö rbitz et al, 2014; Gö rbitz, 2014), dl-2-aminobutyric acid (Abu; Gö rbitz et al, 2012; Nakata et al, 1980;Voogd & Derissen, 1980;Akimoto & Iitaka, 1972;Ichikawa & Iitaka, 1968), dl-norvaline (Nva; Gö rbitz, 2011) and dl-norleucine (Nle; Coles et al, 2009;Harding et al, 1995;Dalhus & Gö rbitz, 1996b;Smets et al, 2015;van den Ende & Cuppen, 2014) as well as for the four quasiracemates l-Nva:d-Nle, l-Nva:d-Met, l-Nle:d-Met (Gö rbitz & Karen, 2015) and l-Abu:d-Met (Gö rbitz et al, 2016). Little is known by comparison about the corresponding enantiomeric amino acids.…”

Syntheses and crystal structures of α methyl alaninium dihydrogen monophosphate and Lβ methyl alaninium dihydrogen monophosphate. An approach for the design and preparation of polar organic-inorganic materials

“…Our attention is called to the isomers of the α aminobutyric acid. Four structural modifications are described for the DLa amino-n-butyric acid Akimoto et al, 1972;Voogd et al, 1980;Nakata et al, 1980). One structural modification is pointed out for the α-amino-isobutyric acid (Hirokawa et al, 1952).…”