Genet, J. P.; Pinel, C.; Ratovelomanana-Vidal, V.; Mallart, S.; Pfister, X.; Bischoff, L.; Cano De Andrade, M. C.; Darses, S.; Galopin, C. published an article about the compound: (S)-Methyl 3-hydroxybutanoate( cas:53562-86-0,SMILESS:C[C@H](O)CC(OC)=O ).Application of 53562-86-0. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:53562-86-0) through the article.
The new class of 2-methylallyl ruthenium chiral diphosphines (P*P)RuII(2-methylallyl)2 (1, P*P = chiral diphosphine) are efficient in asym. hydrogenation of α,β unsaturated acids and allylic alcs. The related chiral halogen-containing ruthenium catalysts (P*P)RuIIX2 (X = halogen) are prepared from 1 or in situ from (COD)Ru[η3-(CH2)2CHCH3]2 by ligand exchange with the chelating diphosphine followed by protonation (HX) in acetone. This procedure allows rapid screening of chiral phosphines, such as Diop, Chiraphos, Cbd, Bppm, Binap, β-glucophos, Biphemp, MeO-Biphep, Me-Duphos, in ruthenium mediated hydrogenations of prochiral substrates. A high efficiency is displayed by Ru-catalysts having atropisomeric ligands (e.e. up to 99%) and a C2 sym. bis(phospholane) has also emerged as a valuable ligand (Me-Duphos, e.e. up to 87% not optimized). Asym. hydrogenation of β-keto esters can be conducted under quite mild conditions (4 atm. of H2, 50°, e.e. up to 99%). β-Keto esters having a disubstituted double bond are also hydrogenated chemoselectively to unsaturated chiral alcs. under controlled conditions with excellent optical purities.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics